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Documents in GRACE

GRACE

Ancillary Documentation
Frequently Updated Documents: Newsletters
Frequently Updated Documents: Technical Notes
Frequently Updated Documents: L1, L2 Release Notes
General Documents
Level-1 Documentation
Level-2 Documentation
Old Documents
Product Descriptions
Reference Documents
Software



GRACE

Ancillary Documentation

Optimal combination of quaternions from multiple star cameras, JPL Internal Memorandum

Describes a procedure for optimally combining quaternions measured simultaneously from different aligned star cameras.

An Analysis of Gravity-Field Estimation Based on Inter-satellite Dual One-Way Biased Ranging

Describes a dual one-way approach for extracting "high-rate" k-band intersatellite biased range measurements.

Frequently Updated Documents: Newsletters

SDS Newsletter for May 2016

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for May 2016. The products are based on 24 days of data between May 8 and May 31. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/ already including the coarse session program. Registration and abstract submission is possible already since July 11. Please note the deadline for abstract submission deadline September 11! * The GRACE Information System and Data Center (ISDC, http://isdc.gfz-potsdam.de/grace-isdc/) archive has been reorganized. GRACE data and documentation is now provided by (anonymous) FTP.

SDS Newsletter for April 2016

Highlights this month: * No RL05 Level-2 products could be generated and delivered for April 2016 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing). * Due to a processing bug, the originally published GFZ Level-2 GSM product for February 2016 (labelled ‘GSM-2_2016029-2016060_0032_EIGEN_G---_005a‘) turned out to be erroneous. A correct product has been generated which has replaced the previous wrong one in the GRACE archives ISDC and PO.DAAC. Please make sure that you use the correct version of the GSM product for February 2016. This can be checked by looking at the product generation date (to be found in the record ‘FIRST’ of the Level-2 product file) which should be ‘20160615’. Note that only the GSM files (*.gz and *.txt) are affected; the corresponding GAx products remain unchanged. * A Version 2.0 of the JPL Mascon solution, processed through March 2016, is now available at the GRACE Tellus website at http://grace.jpl.nasa.gov/. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/ already including the coarse session program. Registration and abstract submission is possible starting on July 11. Please note the deadlines for special rates for accommodation (August 15) and abstract submission (September 11).

SDS Newsletter for March 2016

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for March 2016. The products are based on 31 days of data between March 1 and March 31. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/ already including the coarse session program. Registration and abstract submission is possible starting on July 11. Please note the deadlines for special rates for accommodation (August 15) and abstract submission (September 11)

SDS Newsletter for February 2016

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for February 2016. The products are based on 32 days of data between January 29 and February 29. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/. Registration and abstract submission is possible starting on July 4. Please note the deadlines for special rates for accommodation (August 15) and abstract submission (September 11).

SDS Newsletter for January 2016

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for January 2016. The products are based on 25 days of data between January 4 and January 28. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/ . Registration and abstract submission is possible starting on July 4. Please note the deadlines for special rates for accommodation (August 15) and abstract submission (September 11).

SDS Newsletter for December 2015

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for December 2015. The products are based on 24 days of data between December 11 and January 3. * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site has been established at http://gstm2016.gfz-potsdam.de/gstm-2016/. Registration and abstract submission is possible starting on July 4. Please note the deadlines for special rates for accommodation (August 15) and abstract submission (September 11).

SDS Newsletter for November 2015

Highlights this month: * No RL05 Level-2 products could be generated and delivered for November 2015 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing).

SDS Newsletter for October 2015

Highlights this month: * No RL05 Level-2 products could be generated and delivered for October 2015 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing). * GFZ has generated a new Level-2 correction product 'GAG' which accounts for changes in ECMWF data in May 2015. As already done for GAE and GAF, the GAG product is provided as a GRACE Technical Note (TN-10_GAG-2_2015132-2099001_0000_EIGEN_G---_0005). As a consequence of having a GAG product now, the filename of the GAF product (defined by the period where GAF should be applied) also needed to be changed (now TN-09_GAF-2_2010032-2015131_0000_EIGEN_G---_0005). Additionally, the AOD1B Product Description Document has been updated to include the GAG product (Version 4.4). All files are available in the GRACE archives at JPL and PO.DAAC.

SDS Newsletter for September 2015

Highlights this month: *CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for September 2015. Additionally, I am sorry to notify you the sad news that the US GRACE Science Team Member John Wahr has passed away on November 11. John's son, Andy, created a website www.johnwahr.com for John. This website has a message section that people can write about John. John's family appreciates people's writings about John at this site.

SDS Newsletter for August 2015

Highlights this month: * GFZ has generated and delivered RL05a Level-2 products for September 2014. * CSR has generated and delivered RL05 Level-2 products for October 2014. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for July 2015

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for May and July 2015. The May product was made from overlap data between April 12 and May 11, July was made from overlap data between June 29 and July 31. * GFZ has generated full variance-covariance matrices for the whole RL05a time series. These so-called CSM-products are provided to users on request. For more information, please read the 'Release Notes for GFZ GRACE Level-2 Products - version RL05' which are available in the GRACE archives. * The GRACE Science Team Meeting 2015 was held between September 21 and 23, 2015 at UTCSR in Austin. Proceedings will be available soon at the meeting web site (http://www.csr.utexas.edu/grace/GSTM/). * The GRACE Science Team Meeting 2016 will take place between October 5 and 7, 2016 at GFZ in Potsdam. A web site will be established early 2016.

SDS Newsletter for June 2015

Highlights this month * No RL05 Level-2 products could be generated and delivered for June 2015 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing). * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 at UTCSR in Austin. The abstract submission portal is now open! At the meeting web site at CSR (http://www.csr.utexas.edu/grace/GSTM/) you find also further information on sessions, housing or registration.

SDS Newsletter for May 2015

Highlights this month * No RL05 Level-2 products could be generated and delivered for May 2015 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing). * The new ECMWF IFS (Integrated Forecast System) cycle 41r1, introduced on 11 May 2015, does not affect dramatically the quality of the AOD1B RL05 products. However, as in January 2006 and January 2010, again jumps at locations with high elevations have been detected since the orography resolution in the new cycle has been increased. In contrast to earlier reported plans to correct these jumps already during AOD1B generation, GFZ has decided to stay with the old procedure within RL05 (a-posteriori correction with Level-2 products) and will modify this approach starting with RL06 which is planned for autumn next year. Therefore GFZ will provide shortly a Level-2 GAG product (similar to GAE and GAF, as described in the current AOD1B Product Description Document V4.3 (will be updated accordingly)) to allow land users to correct this jump a-posteriori. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for April 2015

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for April 2015. * GFZ has generated and delivered RL05a Level-2 products for April 2015. * JPL has generated and delivered RL05.1 Level-2 products for April 2015. * JPL has additionally generated and delivered deviant 60x30 RL05.1 Level-2 products for January, February and March 2015 for experimental use (see also corresponding newsletters). * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/.

SDS Newsletter for March 2015

Highlights this month: * A 2-days orbit repeat cycle caused problems to calculate nominal Level-2 products for March 2015 (see also newsletters of January and February 2015 and GRACE ground track plots available at http://www.gfz-potsdam.de/en/grace). The SDS has worked on solution stabilization strategies resulting in the products as described in the following. * CSR has generated and delivered following RL05 Level-2 products for March 2015 (Please refer to the corresponding notes on the CSR website and to the CSR L2 Release Notes):
* A standard 60x60 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 60x30 product for experimental use is provided too. * No 96x96 solution will be generated and delivered.
* GFZ has generated and delivered following RL05a Level-2 products for March 2015 (see also GFZ L2 Release Notes):
* A standard 90x90 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 90x30 product for experimental use is provided too.
* JPL has generated and delivered following RL05.1 Level-2 products for March 2015 (see also JPL L2 Release Notes):
* A standard 60x60 solution where more aggressive than normal post-processing may be required.
* The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for February 2015

Highlights this month: * A 2-days orbit repeat cycle caused problems to calculate nominal Level-2 products for February 2015. This problem has and will also affect the January and March 2015 solutions. The SDS has worked on solution stabilization strategies resulting in the products as described in the following. * CSR has generated and delivered following RL05 Level-2 products for February 2015 (Please refer to the corresponding notes on the CSR website and to the CSR L2 Release Notes):
* A standard 60x60 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 60x30 product for experimental use is provided too. * No 96x96 solution will be generated and delivered.
* GFZ has generated and delivered following RL05a Level-2 products for February 2015 (see also GFZ L2 Release Notes):
* A regularized 90x90 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 90x30 product for experimental use is provided too.
* JPL has generated and delivered following RL05.1 Level-2 products for February 2015 (see also JPL L2 Release Notes):
A standard 60x60 solution where more aggressive than normal post-processing may be required.
* The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/

SDS Newsletter for January 2015

Highlights this month: * A 2-days orbit repeat cycle caused problems to calculate nominal Level-2 products for January 2015. This month also suffers from late switch o­n of GRACE-A and GRACE-B MWAs o­n 2015-01-13 (see Level-1 Notes below) resulting in o­nly 19 days of useful Level-1B data. * The orbit repeat problem will also affect the February and March 2015 solutions. The SDS has worked o­n solution stabilization strategies resulting in the products as described in the following. * CSR has generated and delivered following RL05 Level-2 products for January 2015 (Please refer to the corresponding notes o­n the CSR website and to the CSR L2 Release Notes):
* A standard 60x60 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 60x30 product for experimental use is provided too. * No 96x96 solution will be generated and delivered.
* GFZ has generated and delivered following RL05a Level-2 products for January 2015 (see also GFZ L2 Release Notes):
* A regularized 90x90 solution where more aggressive than normal post-processing may be required. * Additionally, a deviant 90x30 product for experimental use is provided too.
* JPL has generated and delivered following RL05.1 Level-2 products for January 2015 (see also JPL L2 Release Notes):
* A standard 60x60 solution where more aggressive than normal post-processing may be required.
* GFZ has generated and delivered AOD1B RL05 products for 1979-2000 based o­n ERA-interim data.
* The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow o­n the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for December 2014

Highlights this month: * No RL05 Level-2 products could be generated and delivered for December 2014 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/.

SDS Newsletter for November 2014

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for November 2014. * GFZ has generated and delivered RL05a Level-2 products for November 2014. * JPL has generated and delivered RL05.1 Level-2 products for November 2014. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for October 2014

Highlights this month: * GFZ has generated and delivered RL05a Level-2 products for October 2014. * JPL has generated and delivered RL05.1 Level-2 products for September and October 2014. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for September 2014

Highlights this month: * GFZ has generated and delivered RL05a Level-2 products for September 2014. * CSR has generated and delivered RL05 Level-2 products for October 2014. * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/.

SDS Newsletter for August 2014

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for August and September 2014. * GFZ has generated and delivered RL05a Level-2 products for August 2014. * JPL has generated and delivered RL05.1 Level-2 products for the period April 2002 till August 2014. The main differences between RL05.1 and RL05 are the changes to the IERS2010 reference system and use of the 100x100 S1&S2 air tides from Ray/Ponte (2003). RL05.1 also includes the reprocessed AOD RL05 from June 2013 till July 2014 (see below). Further information will be provided in the JPL Level-2 Release Notes and the JPL Level-2 Processing Standards Document. * The proceedings of the GRACE Science Team Meeting, which took place at GFZ in Potsdam between September 29 and October 1, are available at http://www.gfzpotsdam.de/grace/gstm/gstm-2014. * Due to an error in the handling of the input datasets (see also July 2014 newsletter), the AOD1B de-aliasing fields for the period from June 26, 2013 through July 31, 2014 had to be reprocessed and have been updated in the archives. The nature of the AOD1B error and their impact on GRACE Level-2 gravity fields are detailed at the GFZ AOD1B product website (http://www.gfz-potsdam.de/aod1b) and also in the GSTM2014 presentations of session A.0 (see link to GSTM2014 proceedings above). * As a consequence all of the Level-2 data for this duration has been re-processed and the Level-2 fields for the months from June 2013 through July 2014 have been replaced at the PODAAC/ISDC archives. If you downloaded the CSR RL05 Level-2 products GSM, GAC and GAD files for June 2013 through July 2014 solutions prior to October 6, 2014, please download those files again from the GRACE archives. The corresponding reprocessed GFZ products can be recognized by a product generation date ‘20140917’ or later (the date can be found in the record ‘FIRST’ of Level-2 product files). JPL has reprocessed the complete time series April 2002 till August 2014 as RL05.1 (see above). * The next GRACE Science Team Meeting is scheduled for September 21-23, 2015 in Austin. Further information will follow on the GSTM website at CSR at http://www.csr.utexas.edu/grace/GSTM/.

SDS Newsletter for July 2014

Highlights this month: * No RL05 Level-2 products could be generated and delivered for July 2014 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies (MWA) and Instrument Control Units (ICU) in order to reduce the load on the batteries (see also section Level-1 Data Processing). * The program of the GRACE Science Team Meeting, which will take place at GFZ in Potsdam between September 29 and October 1, has been finalized. It is available as the list of abstracts and participants at http://gstm2014.gfz-potsdam.de. Registration is still possible. * The AOD1B RL05 products since 25 June 2013 have been reprocessed and replaced in the GRACE archives (see also comment in the Level-1 Section below). On that day the vertical resolution of the ECMWF deterministic forecast model increased from 91 to 137 levels. Wind stress calculation for OMCT atmospheric forcing requires both temperature and humidity from the lowest model level, which is now 137. Specific humidity has been updated correctly, but temperature remained at 91, leading to a cold bias in the boundary layer and therefore a positive bias in the wind stress. Initial investigations have shown that the effect on gravity field modeling is severe and therefore also all Level-2 products since June 2013 have to be reprocessed (already done for CSR and GFZ). More details will be given in the GSTM2014 SDS Status Session and will be published on the web-site www.gfz-potsdam.de/aod1b

SDS Newsletter for June 2014

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for June 2014. * The next GRACE Science Team Meeting will take place at GFZ in Potsdam between September 29 and October 1, 2014. Registration (till September 15) and abstract submission (till September 7) is already possible. After registration you will also get access to housing information. Further information such as the session description is available at http://gstm2014.gfz-potsdam.de. * The V02 Level-1 data for the following days in the table below have been redelivered to PO-DAAC and ISDC. The reasons for redelivery of these days are: - Day was skipped due to amount of work accommodating spacecraft anomalies - Day was was missing telemetry data due to raw telemetry file corruption - Improved missed interrupt detection - Improved orbit accuracy - Recovery of KBR data previously deemed lost due to an unexplained KBR anomaly The redelivered data are the same as the standard V02 data and are meant to replace the existing V02 data for these days. Many of the redelivered files will be the same as before but with new processing time tags. The processing time tag can be found in the header of each file. This will be the only way to distinguish this redelivered data from the original V02 data. It is also recommended to replace all V02 Level-1 data products for a given day. The redelivered days fall into two categories: - Significant recovery of science data - Recovery of mostly housekeeping telemetry or small science data recovery Further information (such as the table of redelivered days) is provided in the newsletter

SDS Newsletter for May 2014

Highlights: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for May 2014. * The next GRACE Science Team Meeting will take place at GFZ in Potsdam between September 29 and October 2, 2014. Registration and abstract submission is already possible. After registration you will also get access to housing information. Further information such as the session description is available at http://gstm2014.gfz-potsdam.de.

SDS Newsletter for April 2014

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for April 2014. * The next GRACE Science Team Meeting will take place at GFZ in Potsdam between September 29 and October 2, 2014. Registration and abstract submission is already possible. After registration you will also get access to housing information. Further information such as the session description is available at http://gstm2014.gfz-potsdam.de.

SDS Newsletter for March 2014

Highlights this month: * CSR and JPL have generated and delivered RL05 Level-2 products for March 2014. * GFZ has generated and delivered RL05a Level-2 products for March 2014 and for April, May and August till December 2002. * CSR has generated and delivered calibrated errors for all RL05 Level-2 products (GSM-2_*_UTCSR_0060_0005.txt). * CSR has generated and delivered for the whole mission period alternative RL05 Level-2 products up to degree and order 96 (GSM-2_*_UTCSR_0096_0005). * GFZ has updated the AOD1B Product Description Document to Version 4.2 which includes editorial changes to chapters 3.6 and 3.7 to better describe the correct usage of various GAA-GAF Level-2 products. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow soon at http://www.gfz-potsdam.de/grace (follow the GSTM 2014 link on the right). * The German Special Priority Program "Mass transport and distribution in system Earth" invites PhD students to participate in a summer school on the topic "GRACE / GRACE-FO applications for the terrestrial water cycle". The school will be held from September 15-19, 2014 in Mayschoss, near Bonn (Germany). Registration is possible starting now until July 15th. For more information please see the following website: http://www.massentransporte.de/?summerschool

SDS Newsletter for February 2014

Highlights this month * No RL05 Level-2 products could be generated and delivered for February 2014 due to planned switch-offs of the GRACE-A and GRACE-B Microwave Assemblies in order to reduce the load on the batteries (see also section Level-1 Data Processing). * GFZ has generated RL05a Level-2 products for April, May and August till December 2002, but these products have still not yet passed quality control. Further information will be provided in the next Newsletter. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow in summer.

SDS Newsletter for January 2014

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL05 Level-2 products for January 2014 (based on only 16 days, see Level-1 Section below). * GFZ has generated and delivered RL05a Level-2 products for November and December 2013. * GFZ has generated RL05a Level-2 products for April, May and August till December 2002, but these products have still not yet passed quality control. Further information will be provided in the next Newsletter. * GFZ has generated and delivered new GAE and GAF Level-2 products in terms of Technical Notes TN08 and TN09. The coefficients may be used to correct discontinuities in atmospheric pressure data on January 29, 2006 and January 26, 2010, respectively. Details are described in chapter 3.7 of the updated AOD1B Product Description Document Version 4.1 which is, as the Technical Notes, available in the ISDC and PO.DAAC documents section. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow in summer.

SDS Newsletter for December 2013

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for December 2013. * JPL has generated and delivered RL05 Level-2 products for November and December 2013 * GFZ has generated RL05a Level-2 products for November and December 2013 and April, May and August till December 2002. Unfortunately, these products have not yet passed quality control. Further information will be provided in the next Newsletter. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow in summer.

SDS Newsletter for November 2013

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for October and November 2013. * JPL has generated and delivered RL05 Level-2 products for October 2013 and April, May and August till December 2002. * GFZ has generated and delivered RL05a Level-2 products for October 2013. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow next summer.

SDS Newsletter for October 2013

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for April, May and August till December 2002. * RL05 Level-2 products for October 2013 have not yet been generated due to late provision of Level-1B data (caused by a beowulf cluster replacement, which is used at JPL for the final Quality Assurance check). * GFZ has generated and delivered a reprocessed RL05 time series called RL05a for January 2003 till July 2013. All RL05a Level-2 products are available at ISDC and PO.DAAC. When making your request at the ISDC retrieval pages, the RL05a GSM products can be found under the same revision number (“5”) as the RL05 GSM products and are distinguishable by the string “_005a” (instead of “_0005”) at the end of the product name. At the PO.DAAC archive, the RL05a GSM products can be found in the directory “allData/grace/L2/GFZ/RL05”. Note that GAx products are not affected and need not to be replaced! Further details are described in the “Release notes for GFZ RL05 GRACE L2 products”, also available at both archives. For the missing months in 2002 (soon to be delivered) and all upcoming months starting with October 2013, only RL05a products will be generated, i.e. the GFZ RL05 time-series will not be continued. * The GRACE Science Team Meeting 2013 has taken place 23-25 October 2013 at UTCSR. Proceedings are available at http://www.csr.utexas.edu/grace/GSTM/proceedings.html. * The next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow next summer. * The SPP1257 Mass Transport Program will organize a summer school on "GRACE/GRACE-FO applications for the terrestrial water cycle", September 15-19, 2014. More information will be provided soon via the SPP1257 website http://www.massentransporte.de.

SDS Newsletter for September 2013

Highlights this month: * GFZ has generated and delivered RL05 Level-2 products for July 2013. * Due to the switch-off of GRACE ICUs (Instrument Control Units) and MWA (Microwave Assemblies) between August 5 and September 24 in order to reduce the load on the batteries (see L1B Data Processing Section below) the SDS centers have not generated and delivered RL05 Level-2 products for August and September 2013 as just 5 days of data in August and 7 days of data in September don't allow a meaningful monthly estimate for these two calendar months. Therefore, the SDS has decided to provide the next Level-2 data product for the calendar month of October 2013. The GFZ weekly solutions and the CSR QL solutions are not affected by this unfortunate phasing of the outage. All available Level-1B data will be distributed for the months of August and September. * Still missing Level-2 RL05 products for 2002 of the three centers will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 has taken place 23-25 October 2013 at UTCSR. Proceedings will soon be available at http://www.csr.utexas.edu/grace/GSTM. * Next GRACE Science Team Meeting is planned at GFZ in Potsdam between September 29 and October 2, 2014. Further information will follow next summer.

SDS Newsletter for August 2013

Highlights this month: * Due to the switch-off of GRACE ICUs (Instrument Control Units) and MWA (Microwave Assemblies) between August 5 and September 24 in order to reduce the load on the batteries (see L1B Data Processing Section below) the SDS centers have not generated and delivered RL05 Level-2 products for August and/or September 2013 as just 5 days of data in August and 7 days of data in September don't allow a meaningful monthly estimate for these two calendar months. Therefore, the SDS has decided to provide the next Level-2 data product for the calendar month of October 2013. The GFZ weekly solutions and the CSR QL solutions are not affected by this unfortunate phasing of the outage. * Still missing Level-2 RL05 products for 2002 of the three centers will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Information on housing, registration and abstract submission is available at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for July 2013

Highlights this month: * CSR and JPL have generated and delivered RL05 Level-2 products for July 2013 * GFZ has generated and delivered RL05 Level-2 products for June 2013 * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Information on housing, registration and abstract submission is now available at http://www.csr.utexas.edu/grace/GSTM. * The AOD1B Product Description Document for Product Release 05 (Rev. 4.0, 9 September 2013) is now available at ISDC and PO.DAAC. * As of 28 August 2013, the Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences has a new website (http://www.gfz-potsdam.de). Therefore, we kindly ask you to update your links, as appropriate. The GRACE mission is still available at http://www.gfz-potsdam.de/grace, latest information on AOD1B products can still be found under http://www.gfz-potsdam.de/aod1b. Please excuse any possible temporary discrepancies due to the change over and feel free to contact me with any suggestions.

SDS Newsletter for June 2013

Highlights this month: * CSR and JPL have generated and delivered RL05 Level-2 products for June 2013 * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Information on housing is now available at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for May 2013

Highlights this month: * GFZ has generated and delivered RL05 Level-2 products for April 2013 * CSR, JPL and GFZ have generated and delivered RL05 Level-2 products for May 2013 * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for April 2013

Highlights: * CSR and JPL have generated and delivered RL05 Level-2 products for April 2013 * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for March 2013

Highlights: * GFZ has generated and delivered RL05 Level-2 products for February 2013. * No RL05 Level-2 products could be generated and delivered for March 2013 due to planned switch-offs of the GRACE-A and GRACE-B Instrument Control Units and Microwave Assemblies in order to reduce the load on the batteries (see also section Level-1 Data Processing). * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM

SDS Newsletter for February 2013

Highlights: * CSR and JPL have generated and delivered RL05 Level-2 products for January and February 2013. * GFZ has generated and delivered RL05 Level-2 products for January 2013. * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be * provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for January 2013

Highlights this month: * CSR, JPL and GFZ have generated and delivered RL05 Level-2 products for December 2012. * Ongoing updates on CSR RL05 are provided at http://www.csr.utexas.edu/grace/RL05.html. * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. * Please refer to the upcoming newsletters. The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for December 2012

Highlights this month: * CSR, JPL and GFZ have generated and delivered RL05 Level-2 products for November 2012. * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * Additionally to the standard monthly solutions, GFZ now also provides weekly RL05 solutions (aligned to GPS weeks) which contain spherical harmonic coefficients complete up to degree and order 30. Currently, available weekly solutions cover the time span from 2003/01/05 till 2012/09/22. The weekly Level-2 products (GSM + GAx files) can be downloaded at GFZ's ISDC archive. When making your request at the ISDC retrieval pages, please choose “GFZ Potsdam weekly” as “Processing Facility” to obtain these products. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for November 2012

Highlights this month: * Generation and delivery of RL05 Level-2 products for November and December 2012 not yet completed. Please refer to the upcoming December 2012 newsletter. * Still missing Level-2 RL05 products for 2002 of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for October 2012

Highlights this month: * GFZ has generated and delivered RL05 Level-2 products for September 2012, January till May 2003, July till December 2003 and January 2004. * Still missing Level-2 RL05 products of the three centers will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for September 2012

Highlights this month: * CSR and JPL have both generated and delivered RL05 Level-2 products for September 2012, January till May 2003 and July till December 2003. * GFZ has generated and delivered RL05 Level-2 products for August 2012. * Still missing Level-2 RL05 products of the three centers will be provided soon. Please refer to the upcoming newsletters. * The GRACE Science Team Meeting 2013 will take place 23-25 October 2013 at UTCSR. Further information will follow at http://www.csr.utexas.edu/grace/GSTM.

SDS Newsletter for August 2012

Highlights this month: * CSR and JPL have generated and delivered RL05 Level-2 products for August 2012. * Still missing Level-2 RL05 products of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The Joint GRACE Science Team Meeting 2012 and Final Colloquium of the DFG Special Priority Program SPP1257 "Mass Transport and Mass Distribution in System Earth" took place at the German Research Centre for Geosciences in Potsdam between September 17 and 19, 2012. The proceedings and further information can be found at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting.

SDS Newsletter for July 2012

Highlights this month: * CSR and GFZ have generated and delivered RL05 Level-2 products for July 2012. * JPL has generated and delivered RL05 Level-2 products for June and July 2012. * Still missing Level-2 RL05 products of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The AOD1B product web page has moved to http://www.gfz-potsdam.de/AOD1B. * The Joint GRACE Science Team Meeting 2012 and Final Colloquium of the DFG Special Priority Program SPP1257 "Mass Transport and Mass Distribution in System Earth" took place at the German Research Centre for Geosciences in Potsdam between September 17 and 19, 2012. Further information can be found at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting. Proceedings will be made available mid of October 2012.

SDS Newsletter for June 2012

Highlights this month: * CSR has generated and delivered RL05 Level-2 products for February 2011 till June 2012, except June 2011 and May 2012 (due to missing accelerometer data). * JPL has generated and delivered RL05 Level-2 products for February 2011 till April 2012, except June 2011 (due to missing accelerometer data). * GFZ has generated and delivered RL05 Level-2 products for January till June 2012 (except May 2012 due to missing accelerometer data), February till December 2011 (except June 2011 due to missing accelerometer data) and February till December 2004. Note that due to sparse ground track coverage caused by short-interval repeat orbit patterns some of the new solutions are stabilized by applying a modified version of the regularization method used for previous releases, which is based on Kaula?s power law. The stabilized solutions can be identified by the string ?GK2-? instead of ?G---? in the GFZ GSM-product name. For further details please refer to the ?Release Notes for GFZ GRACE Level-2 Products - version RL05? which can be downloaded at the archives. * Still missing Level-2 RL05 products of the three centers (see tables below) will be provided soon. Please refer to the upcoming newsletters. * The final program of the next GRACE Science Team Meeting (GSTM) combined with the Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" (17.-19.9.2012) and followed by a Sea Level Workshop on 20 September 2012 (both at GFZ in Potsdam) will be made available likely on August 27. Please visit http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting.

SDS Newsletter for May 2012

Highlights this month: * GFZ has generated and delivered RL04 Level-2 products for April 2012. * RL05 will substitute RL04 Level-2 and RL02 will substitute RL01 Level-1 data starting from May 2012. * Missing Level-2 RL04 products from JPL (February till April 2012) as well as missing Level-2 RL05 products (see table below) will be provided soon. Please refer to the upcoming newsletters. * Registration and abstract submission for the next GRACE Science Team Meeting (GSTM) combined with the Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" (17.-19.9.2012) and followed by a Sea Level Workshop on 20 September 2012 (both at GFZ in Potsdam) is now possible. Note that the registration and abstract submission deadline is Sunday, August 5. For more information please visit http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting. Important Note: As in mid September 2012 there are several large trade fares taking place in Berlin (e.g. ILA (Berlin Air Show) and Innotrans (International Trade Fair for Transport Technology)) with many hotels in Berlin and Potsdam being blocked for a long time already we couldn't arrange block reservations in our favorite hotels. Therefore we strongly recommend that you organize your travel arrangements quickly!

SDS Newsletter for April 2012

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for March and April 2012. * GFZ has generated and delivered RL04 Level-2 products for March 2012. * RL05 will substitute RL04 Level-2 and RL02 will substitute RL01 Level-1 data (see also March 2012 newsletter) starting from May 2012. Missing Level-2 RL04 products from GFZ and JPL as well as missing Level-2 RL05 products will be provided soon. Please refer to the upcoming newsletters. * The following new or updated documents are now available at both archives

SDS Newsletter for March 2012

Highlights this month: * GRACE celebrated 10th anniversary on March 17. * CSR has generated and delivered RL04 Level-2 products for February 2012. * All three centers have generated and delivered RL05 Level-2 products (CSR up to degree 60 for period 2004-2010, GFZ up to degree 90 for period 2005-2010, JPL up to degree 90 for period 2004-2010) based on reprocessed L1B data (RL02), updated processing standards and background models. Updated RL02/RL05 documentation (e.g. Release Notes, Processing Standards Documents) is partly also already available at the archives and will be completed along with still missing monthly products during the next few weeks. The new L1/L2 products are already publicly available. * RL05 will substitute RL04 within the next months. Please refer to the upcoming newsletters. * Next GRACE Science Team Meeting (GSTM) combined with the Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" will take place on 17-19 September 2012. It will be followed by a Sea Level Workshop on 20 September 2012 (both at GFZ in Potsdam). Information is available at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting. * Important Note: As in mid September 2012 there are several large trade fares taking place in Berlin (e.g. ILA (Berlin Air Show) and Innotrans (International Trade Fair for Transport Technology)) with many hotels in Berlin and Potsdam being blocked for a long time already we couldn?t arrange block reservations in our favorite hotels. Therefore we strongly recommend that you organize your travel arrangements quickly!

SDS Newsletter for February 2012

Highlights this month: * GFZ has generated and delivered RL04 Level-2 products for December 2011. Due to missing accelerometer data on both satellites in the first half of December, this model was derived with data from the period 12 December 2011 till 11 January 2012. Further information is available in the GFZ L2 Processing Standards Document. * GFZ and JPL have generated and delivered RL04 Level-2 products for January 2012. * A web page with information on accommodation at the next GRACE Science Team Meeting (GSTM) / Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" on 17-19 September 2012 as well as for the Sea Level Workshop on 20 September 2012 (both at GFZ in Potsdam) is available at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+ Konferenzen/2012/GRACE+Meeting * Important Note: As in mid September 2012 there are several large trade fares taking place in Berlin (e.g. ILA (Berlin Air Show) and Innotrans (International Trade Fair for Transport Technology)) with many hotels in Berlin and Potsdam being blocked for a long time already we couldn?t arrange block reservations in our favorite hotels. Therefore we strongly recommend that you organize your travel arrangements quickly!

SDS Newsletter for January 2012

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for December 2011. Due to missing accelerometer data on both satellites in the first half of December, this model was derived with data from the period 12 December 2011 till 11 January 2012. Further information is available in the CSR L2 Processing Standards Document. * CSR has generated and delivered RL04 Level-2 products for January 2012. * GFZ has generated and delivered RL04 Level-2 products for November 2011. Due to missing accelerometer data on both satellites in the second half of November, this model was derived with data from the period 16 October 2011 till 16 November 2011. Further information is available in the GFZ L2 Processing Standards Document. * JPL has generated and delivered RL04 Level-2 products for November 2011. Due to missing accelerometer data on both satellites in the second half of November, this model was derived with data from the period 17 October 2011 till 16 November 2011. Further information is available in the JPL L2 Processing Standards Document. * JPL has generated and delivered RL04 Level-2 products for December 2011. Due to missing accelerometer data on both satellites in the first half of December, this model was derived with data from the period 19 December 2011 till 15 January 2012. Further information is available in the JPL L2 Processing Standards Document. * A web page for the next GRACE Science Team Meeting (GSTM) which will be combined with the Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" and which will take place on 17-19 September 2012 at GFZ in Potsdam/Germany is now available at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2012/GRACE+Meeting. * Note that on September 20 2012 there will be a Sea Level Workshop. Further information will become available soon.

SDS Newsletter for December 2011

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for November 2011. Due to missing accelerometer data on both satellites in the second half of November, this model was derived with data from the period 16 October till 16 November 2011. Further information is available in the CSR L2 Processing Standards Document. * JPL has generated and delivered RL04 Level-2 products for September and October 2011.

SDS Newsletter for November 2011

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for September and October 2011 * GFZ has generated and delivered RL04 Level-2 products for October 2011. * The next GRACE Science Team Meeting (GSTM) will take place at the German Research Centre for Geosciences (GFZ) in Potsdam, Germany, between September 17 and 19, 2012. It will be combined with the Final Colloquium of the DFG Special Priority Program "Mass Transport and Mass Distribution in System Earth" and followed by a one day Sea Level Workshop (September 20). Further details will become available in spring.

SDS Newsletter for October 2011

Highlights this month: * Due to RL05 reprocessing issues and other items, no new RL04 Level-2 products have been generated by the SDS so far.

SDS Newsletter for September 2011

Highlights this month: ? GFZ has generated and delivered RL04 Level-2 products for September 2011.

SDS Newsletter for August 2011

Highlights this month: * CSR, JPL and GFZ have generated and delivered RL04 Level-2 products for August 2011. * The Proceedings of the 2011 Grace Science Team Meeting are now online. See the Past Meetings link to the right at http://www.csr.utexas.edu/grace/GSTM/ .

SDS Newsletter for July 2011

Highlights this month: * GFZ has generated and delivered RL04 Level-2 products for July 2011. * Generation of CSR RL04 Level-2 products for July 2011 is nearly finished. Users are requested to check the archives in the next few days for this new model. * The GRACE satellites have passed the ?'=0 event on June 16. Consequently, the accelerometers had already been turned off on June 6 (GRACE-B) and June 7 (GRACE-A), respectively, in order to manage the battery use. The accelerometers have been successfully switched on again on July 4 (GRACE-A) and June 29 (GRACE-B), respectively. Please recall that the remainder of the data (KBR, GPS & star camera) has been collected routinely all along and _has now been declared public_ (as well as the January 2011 data). The actual mission status can be monitored at http://www.csr.utexas.edu/grace/operations/mission_status/.

SDS Newsletter for June 2011

Highlights this month: * The GRACE satellites have passed the ??=0 event on June 16. Consequently, the accelerometers had already been turned off on June 6 (GRACE-B) and June 7 (GRACE-A), respectively, in order to manage the battery use. The accelerometers have been successfully switched on again on July 4 (GRACE-A) and June 29 (GRACE-B), respectively. Please recall that the remainder of the data (KBR, GPS & star camera) has been collected routinely all along. The actual mission status can be monitored at http://www.csr.utexas.edu/grace/operations/mission_status/ . * No RL04 Level-2 products for June 2011 have been generated so far. * The Scientific Sessions and Abstracts link on the GSTM2011 page http://www.csr.utexas.edu/grace/GSTM/ is now available for you to submit your abstracts (due by August 1, 2011). The format is very similar to the past meetings. Please remember to register as soon as you know you can make it to the meeting. Information on Housing is available as well. As before, this remains the responsibility of the attendee.

SDS Newsletter for May 2011

Highlights this month: * CSR and GFZ have generated and delivered RL04 Level-2 products for May 2011, JPL for April and May 2011. * The Scientific Sessions and Abstracts link on the GSTM2011 page http://www.csr.utexas.edu/grace/GSTM/ is now available for you to submit your abstracts. The format is very similar to the past meetings. Please remember to register as soon as you know you can make it to the meeting. Information on Housing is available as well - as before, this remains the responsibility of the attendee.

SDS Newsletter for April 2011

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for March and April 2011. * GFZ has generated and delivered RL04 Level-2 products for February till April 2011. * JPL has generated and delivered RL04 Level-2 products for February and March 2011. * The registration for the 2011 GRACE Science Team Meeting in Austin, Texas (August 8-10, 2011) is now open. Prompt registration is requested that the organizing committee can get ahead on the necessary arrangements! The GRACE SDS also invites thoughts on any thematic discussions you would like to see during the GSTM2011 program. Please email to Srinivas Bettadpur. Further information on the scientific program will become available shortly.

SDS Newsletter for March 2011

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for February 2011. * Since January 1, 2011, satellite related events have delayed the release of the GRACE data. To accommodate the requests for access to the GRACE data for studies related to the M9 earthquake off the coast of Sendai, Japan, the project has prepared a limited set of early release Level-1B data covering the earthquake epoch. Therefore, the GRACE L1B data from 01 March, 2011 till 14 April, 2011 are now available at PODAAC and also at ISDC. As for past events, the project would appreciate being informed of any conclusions reached using this data. * The GRACE satellite operations status depends on the health of the battery and the duration within each orbit when the battery is in use. A new info page has been set up at CSR where the conditions are from now on updated on a weekly basis: http://www.csr.utexas.edu/grace/operations/mission_status/ * The next GRACE Science Team Meeting will be held in Austin, Texas, from August 8-10, 2011. Please visit http://www.csr.utexas.edu/grace/GSTM/ site regularly for further details.

SDS Newsletter for February 2011

Highlights this month: ? Due to non-availability of GRACE-B accelerometer data throughout the month the SDS has not generated RL04 Level-2 products for January 2011. ? The next GRACE Science Team Meeting will be held in Austin, Texas, from August 8-10, 2011. Please visit http://www.csr.utexas.edu/grace/GSTM/ site regularly for further details.

SDS Newsletter for January 2011

Highlights this month: * JPL has generated and delivered RL04 Level-2 products for November 2010. * CSR, GFZ and JPL have generated and delivered RL04 Level-2 products for December 2010. Data up to and including December 27, 2010 was used for these solutions. Please see Level-1 Data Processing Notes for further details. * The next GRACE Science Team Meeting will be held in Austin, Texas, from August 8-10, 2011. Please visit http://www.csr.utexas.edu/grace/GSTM/ site regularly for further details.

SDS Newsletter for December 2010

Highlights this month * CSR has generated and delivered RL04 Level-2 products for November 2010. * GFZ has generated and delivered RL04 Level-2 products for October and November 2010.

SDS Newsletter for November 2010

Highlights this month: * JPL has generated and delivered RL04 Level-2 products for October 2010. This is their 100th RL04 monthly gravity field! * GFZ has generated and delivered RL04 Level-2 products for September 2010. * The Proceedings of the Grace Science Team Meeting at GFZ in Potsdam on 11/12 November 2010 are now online available at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2010-Conferences/GSTM-2010/proceedings * The list of GRACE related publications online available at http://www-app2.gfz-potsdam.de/pb1/op/grace/ under item "Publications" has been significantly updated to 696 papers.

SDS Newsletter for October 2010

Highlights: * CSR and JPL have generated and delivered RL04 Level-2 products for September 2010. * GFZ has generated and delivered RL04 Level-2 products for August 2010. * The Grace Science Team Meeting took place at GFZ in Potsdam on 11/12 November 2010 with more than 140 registrants! Meeting proceedings will be made available shortly.

SDS Newsletter for September 2010

Highlights this month: * CSR and JPL have generated and delivered RL04 Level-2 products for July and August 2010. * GFZ has generated and delivered RL04 Level-2 products for July 2010. * *Abstract submission deadline for the next Grace Science Team Meeting at GFZ in Potsdam on 11/12 November 2010 is Sunday, Oct 24th, 2010, 2359 UTC! Please don?t forget to provide the session number at begin of your abstract title!* * Further information can be found in the August newsletter as well as at the meeting web side http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2010-Conferences/GSTM-2010.

SDS Newsletter for August 2010

Highlights this month: * JPL has generated and delivered RL04 Level-2 products for July 2010. The corresponding CSR and GFZ products for July 2010 will be available in the very next days. Please check the archives for updates. * Online registration and abstract submission for the next Grace Science Team Meeting at GFZ in Potsdam on 11/12 November 2010 is now possible at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2010-Conferences/GSTM-2010. There you can also find information on the coarse session program and schedule or help on accommodation. Some important information on abstract submission: o Deadline is October 24 as we need time to prepare the final program o You need first to register yourself! o Please note that you have to provide the surname, e-mail and password exactly as provided in the registration confirmation. In case of technical problems please contact Hartmut Pflug (pflug@gfz-potsdam.de). o Please provide the requested Session Number (A.1-A.3 or B.1-B.6, see Session Program) in front of your title, e.g. * A.1 Simulation Study for a Future Gravity Mission or * B.5 Estimating groundwater storage changes in large River basins using GRACE data o Type of presentation is or . The type and the field behind are obsolete. o As the program will be very dense and we have also reserved in each session time for open-floor discussion, it is very likely that we cannot accept each presentation as oral presentation and instead we will have to shift several to posters on day 1. You will be informed on our decision by October 31. Please continue to visit the GSTM2010 site regularly for updated information.

SDS Newsletter for July 2010

*Highlights this month: * CSR, GFZ and JPL have generated and delivered RL04 Level-2 products for June 2010. Online registration for the next Grace Science Team Meeting at GFZ in Potsdam on 11/12 November 2010 is now possible at http://www.gfz-potsdam.de/portal/gfz/Neuestes/Veranstaltungen/Tagungen+und+Konferenzen/2010-Conferences/GSTM-2010. There you can also find information on the coarse session program or accommodation. Abstract submission will be possible early September (deadline October 24!). Please continue to visit this site regularly for updated information.

SDS Newsletter for June 2010

Highlights this month: * CSR and GFZ have generated and delivered RL04 Level-2 products for May 2010. * A web page for the next Grace Science Team Meeting taking place at GFZ in Potsdam on 11/12 November 2010 including the coarse Session Program as well as information on accommodation and registration is now available at http://www.gfz-potsdam.de/portal/gfz/Struktur/Departments/Department+1/sec12/highlights. Please continue to visit this site regularly for updated information.

SDS Newsletter for May 2010

Highlights this month: * CSR and JPL have generated and delivered RL04 Level-2 products for April 2010. * GFZ has generated and delivered RL04 Level-2 products for February, March and April 2010.

SDS Newsletter for April 2010

Highlights this month: * CSR and JPL have generated and delivered RL04 Level-2 products for March 2010 * *Currently the L1B Read software has been updated to accommodate 64-bit machines but the software will also work on 32 bit machines. Please change RELEASE_2008-03-20 to RELEASE_2010-03-31.

SDS Newsletter for March 2010

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for February 2010. * GFZ has generated unconstrained degree 60 and degree 120 solutions for January 2010. Further information can be found in the GFZ L2 Release Notes and in the February 2010 Newsletter.

GRACE Monthly Report from January 2010 is available

Highlights this month: * CSR has generated and delivered RL04 Level-2 products for December 2009. * GFZ and JPL are experimenting with degree 60 solutions to overcome notable monthly model degradations caused by the current 7 day repeat cycle. Results will be made available with the next newsletter.

SDS Newsletter February 2010

- CSR has generated and delivered RL04 Level-2 products for January 2010. - GFZ has generated unconstrained degree 60 solutions for the period October 2008 till December 2009 to overcome creeping and now notable monthly (degree 120) model degradations caused by the current long lasting 7 day repeat cycle with climax around December 2009/January 2010. These additional L2 products are named *GM60* which is in agreement with GFZ?s unconstrained degree 30 weekly solutions (*GW30*). The unconstrained degree 120 solutions are still provided for comparison (current status is December 2009). According to degree variance plots (see appendix) and results of GFZ?s evaluation chain, it is recommended to use the alternative solutions starting with May 2009 till now. For the months before, a cut-off of the 120x120 solutions at degree 60 delivers approximately the same results as the corresponding 60x60 solutions. Further information can be found in the GFZ L2 Release Notes. - JPL has generated and delivered unconstrained degree 60 solutions for December 2009, January 2010, and February 2010 to overcome the solution degradations caused by the near 7 day repeat cycle. Further information can be found in the JPL L2 Release Notes. - DLR agency, DLR R&D and GFZ have agreed on funding for Mission Operation at DLR/GSOC till GRACE mission end of lifetime. GFZ will contribute with 500KEUR/yr!

SDS Newsletter December 2009

Highlights: CSR and GFZ have generated and delivered RL04 Level-2 products for November 2009, JPL for October and November 2009. For GFZ products see comment below and in the GFZ Release Notes for GRACE L2 Products. The proceedings of the GRACE Science Team Meeting held in Austin on November 2/3 2009 have been made available at http://www.csr.utexas.edu/grace/GSTM/2009/

SDS Newsletter November 2009

Highlights: CSR and GFZ have generated and delivered RL04 Level-2 products for October 2009. Next GRACE Science Team Meeting will take place at GFZ in Potsdam on 11/12 November 2010!

SDS Newsletter October 2009

Highlights: *CSR, GFZ & JPL have generated and delivered RL04 Level-2 products for September 2009. *The following acknowledgement shall be added to any new GRACE related publication (paper, poster etc.): Acknowledgement: We would like to thank the German Space Operations Center (GSOC) of the German Aerospace Center (DLR) for providing continuously and nearly 100% of the raw telemetry data of the twin GRACE satellites.

SDS Newsletter September 2009

Highlights this month: * CSR, GFZ and JPL have generated and delivered RL04 Level-2 products for August 2009. * The 2nd GRACE Hydrology Workshop and the GRACE Science Team Meeting will be held in Austin on November 4 and November 5/6, respectively. More information (such as the detailed program for the GSTM) is available at http://www.csr.utexas.edu/grace/GSTM/ or http://neptune.gsfc.nasa.gov/hsb/index.php?section=188.

SDS Newsletter August 2009

Highlights this months were: * CSR has generated and delivered RL04 Level-2 products for July 2009, GFZ and JPL for June and July 2009. * The GFZ RL04 Level-2 gravity field for December 2008 (GSM-2_2008336-2009001_0029_EIGEN_G---_0004) has been updated at PODAAC on September 22 as the product due to unknown reasons did not contain C21/S21 drift rates. The product at ISDC was (and is) correct. * The 2nd GRACE Hydrology Workshop will be held the day before the science team meeting in August. More info is available at http://neptune.gsfc.nasa.gov/hsb/index.php?section=188

SDS Newsletter July 2009

Highlights: CSR has generated and delivered RL04 Level-2 products for June 2009, GFZ for May 2009.

SDS Newsletter June 2009

Highlights: * CSR has generated and delivered RL04 Level-2 products for May 2009, GFZ for April 2009 and JPL for April and May 2009. * GRACE Technical Note #02 which provides recommendations for a-priori bias and scale parameters for Level-1B accelerometer data has been updated. * Registration is now open for the next GRACE Science Team Meeting, to be held on November 5-6, 2009, in Austin (see http://www.csr.utexas.edu/grace/GSTM/). Attendees are urged to register as soon as they know they will be attending. The registration fee is US $125, payable as before with either checks or credit cards. Please note carefully the modes of payment in advance, and on site.

SDS monthly newsletter May 2009

CSR has generated and delivered RL04 Level-2 products for April 2009, GFZ for March 2009. * New GGM03S and GGM03C mean gravity fields are available. These fields being based on four years of data from CSR's RL04 processing and have the following filenames: GSM-2_2003001-2006365_1461_UTCSR_0180_0004 (GGM03S) GCM-2_2003001-2006365_1461_UTCSR_0360_0004 (GGM03C) * GRACE Technical Note #02 which provides recommendations for a-priori bias and scale parameters for Level-1B accelerometer data will be updated soon. Please visit the documentation pages at the archives regularly. * The next GRACE Science Team Meeting will take place on November 5/6 at CSR in Austin. Please continue to visit http://www.csr.utexas.edu/grace/GSTM/ for further details

SDS monthly newsletter April 2009

Highlights: * CSR has generated and delivered RL04 Level-2 products for March 2009, GFZ for February 2009. * The next GRACE Science Team Meeting will take place on November 5/6 at CSR in Austin. The meeting website with some information on scientific meetings relevant to GRACE, has been updated. Please continue to visit http://www.csr.utexas.edu/grace/GSTM/ for further details.

SDS monthly newsletter March 2009

SDS monthly newsletter March 2009 * CSR has generated and delivered RL04 Level-2 products for February 2009, JPL for January till March 2009. * The next GRACE Science Team Meeting will take place on November 5/6 at CSR in Austin. Please continue to visit http://www.csr.utexas.edu/grace/GSTM/ for further details.

SDS monthly newsletter February 2009

SDS monthly newsletter February 2009 Highlights this month: CSR and GFZ have generated and delivered RL04 Level-2 products for February 2009.

SDS monthly newsletter January 2009

SDS monthly newsletter January 2009 Highlights this month: * The GRACE Science Team Meeting proceedings (collection of presentations, PDF, 98 MB) are now available online, at: http://www.csr.utexas.edu/grace/GSTM/proceedings.html. * CSR has generated and delivered RL04 Level-2 products for December 2008, GFZ and JPL for November and December 2008.

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Frequently Updated Documents: Technical Notes

GRACE Technical Note #07 May 2016

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created May 2, 2016 - last month reported is March 2016. !!! PLEASE NOTE NEW COMMENT IN ITEM #6 !!! SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months. 5) The GRACE gravity solution from CSR for 'May 2015' actually spans April 12, 2015 to May 11, 2015, due to the lack of useful data in the latter half of May. A replacement value is provided for this special solution (denoted by *). 6) The 'monthly' RL05 solutions from December 2015 onward will not necessarily be based on GRACE data from just one month. The epoch of the C20 replacement will be indicated by the same epoch of the data in the RL05 solution. As before, these special cases will by denoted by *.

GRACE Technical Note #10 December 2015

GRACE Technical Note 10 TITLE: GAG model to correct discontinuities in atmospheric pressure data in May 2015. UPDATE HISTORY: Created September 14, 2015 – initial version. SPECIAL NOTES: Please use these coefficients to correct discontinuities in atmospheric pressure data on May 12, 2015 as described in chapter 3.7 of the AOD1B Product Description Document Version 4.4.

GRACE Technical Note #09 April 2014

GRACE Technical Note 09 TITLE: GAF model to correct discontinuities in atmospheric pressure data in January 2010. UPDATE HISTORY: Created April 7, 2014 – initial version. SPECIAL NOTES: Please use these coefficients to correct discontinuities in atmospheric pressure data on January 26, 2010 as described in chapter 3.7 of the AOD1B Product Description Document Version 4.1.

GRACE Technical Note #08 April 2014

GRACE Technical Note 08 TITLE: GAE model to correct discontinuities in atmospheric pressure data in January 2006. UPDATE HISTORY: Created April 7, 2014 – initial version. SPECIAL NOTES: Please use these coefficients to correct discontinuities in atmospheric pressure data on January 29, 2006 as described in chapter 3.7 of the AOD1B Product Description Document Version 4.1.

GRACE Technical Note #05 June 2012

TITLE: Monthly estimates of C20 from 5 SLR satellites UPDATE HISTORY: Updated June 12, 2012 - last month reported is April 2012. An error in the year assigned to the last value was corrected. The MJD, corresponding to March 20, 2012, was correct. April 2012 will be the last update to TN05; all future updates will be based on the Release-05 models and provided in GRACE Technical Note 07.

GRACE Technical Note #02: ACC biases (pdf-Format)

Recommendation for a-priori Bias & Scale Parameters for Level-1B ACC Data (Version 2)

GRACE Technical Note 06

Impact of change in AOD1B on RL04

GRACE Technical Note #04: Usage guidelines for GFZ RL03 and JPL RL02 GRACE

gravity fields & atmosphere/ocean background models Provides detailed guidelines for usage on GFZ RL03 and JPL RL02 GRACE models.

GRACE Technical Note #03: Sequence of Events (SOE) format description

Provides a detailed description and format information on how the SOE file is organized.

GRACE Technical Note #01: Sequence of Events (SOE) File

Provides a record of changes of the state of a specific satellite sensor or satellite event, which may alter the processing parameters used for the L1B processing. This file is updated on a daily basis.

Frequently Updated Documents: L1, L2 Release Notes

Release notes for JPL RL05 GRACE L2 products

Gives additional information on JPL RL05 GRACE L2 products

Release notes for GFZ RL05 GRACE L2 products

Gives additional information on GFZ Potsdam RL05 GRACE L2 products. New file available. Last update: 16.06.2016.

Release notes for GFZ RL04 GRACE L2 products

Gives additional information on GFZ Potsdam RL04 GRACE L2 products. New file available. Uploaded on 05 July 2012.

Release notes for GRACE L-2 calibration products - version JPL RL04.1

Gives additional information on JPL RL04 GRACE L2 products (not contained in JPL RL04 processing standards document). Includes notes from: 2007-11-30

Release notes for GFZ RL03 GRACE L2 products (08.2007)

Gives additional information on GFZ Potsdam RL03 GRACE L2 products. Includes notes from: 2007-08-23 2007-06-26 2007-05-15 2007-04-13

Release notes for CSR RL04 GRACE L2 products (06.2007)

Gives additional information on CSR RL04 GRACE L2 products. Includes notes from: 2007-06-07

Release Notes for GRACE L-2 products - version UTCSR RL-04

Release Notes for GRACE L-2 products - version UTCSR RL-04 Last Product List Update: 2007-04-11 - Products for 2002, 2004 & 2006, 10 fields, added Includes notes from: 2007-04-11

Release Notes for JPL RL04 GRACE L2 products

Gives additional information on JPL RL04 GRACE L2 products (not contained in JPL RL04 processing standards document). Includes notes from: 2007-02-20

Release Notes for GRACE L1B products

Gives additional information on GRACE L1B products (not contained in other L1 documents). Includes notes from: 2006-05-02 2004-08-19 2004-08-06 2004-08-06 2004-08-04 2004-03-03 2004-01-26

General Documents

GRACE Product Specification Document

Provides a detailed description of data products at all levels for the GRACE mission.

GRACE public documentation

A list of available GRACE Documents.

GRACE Science Data System Development Plan

Defines the GRACE Science Data System (SDS) and describes the data flow and roles and responsibilities of each SDS component.

Level-1 Documentation

AOD1B Product Description Document for Product Release 05

Describes the atmospheric and oceanic de-aliasing product (AOD1B) for Release 05

GRACE Level 1B Data Product User Handbook

Provides a comprehensive description of the content and format of the Level 1B data.

AOD1B Product Description Document for Product Releases 01 to 04

Describes the atmospheric and oceanic de-aliasing product (AOD1B) and the barotropic or baroclinic ocean model output (OCN1B) for Releases 01 to 04.

Algorithm Theoretical Basis Document for GRACE Level-1B Data Processing

Describes the algorithms producing the main quantities on the Level 1B data.

Level-2 Documentation

JPL Level-2 Processing Standards Document for Product Release 05

This document serves as a record of the processing standards, models & parameters adopted for the generation of the Level-2 gravity field data products by the GRACE Science Data System component at NASA The Jet Propulsion Laboratory of the California Institute of Technology (JPL).

GFZ Level-2 Processing Standards Document for Product Release 05

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 05 generated at GFZ.

CSR Level-2 Processing Standards Document for Product Release 05

This document serves as a record of the processing standards, models & parameters adopted for the creation of the Level-2 gravity field data products by the GRACE Science Data System component at The University of Texas Center for Space Research (UTCSR).

GRACE Level-2 Gravity Field Product User Handbook

Provides a description of the Earth gravity field estimates provided by the Level 2 processing.

GRACE Gravity Field Solution Data Format

Describes the Level-2 GRACE gravity data formats.

CSR Level-2 Processing Standards Document for Product Release 04

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 04 generated at CSR.

GFZ Level-2 Processing Standards Document for Product Release 04

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 04 generated at GFZ.

JPL Level-2 Processing Standards Document for Product Release 04

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 04 generated at JPL.

Old Documents

GRACE Technical Note #07 March 2016

TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created March 3, 2016 - last month reported is January 2016.  !!!      PLEASE NOTE NEW COMMENT IN ITEM #6     !!! SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM         files of the GRACE RL05 products only. These estimates should not         be used with the GRACE RL04 or earlier products. In particular, a         rate for C20 has not been modeled for RL05, whereas a rate was         modeled for RL04.         1) The GRACE gravity solution from CSR for 'November 2011' actually         spans October 17, 2011 to November 16, 2011, due to the lack of         useful accelerometer data in the latter half of November. A         replacement value of C20 is provided for this special solution         (denoted by *) as well as for the full calendar month of November 2011.          2) The GRACE gravity solution from CSR for 'December 2011' actually         spans December 12, 2011 to January 11, 2012, due to the lack of         useful accelerometer data in the first half of December. A         replacement value of C20 is provided for this special solution         (denoted by *) as well as for the full calendar month of December 2011.          3) The GRACE gravity solution from CSR for 'April 2012' actually         spans March 20, 2012 to April 19, 2012, due to the lack of         useful accelerometer data in the latter half of April. A         replacement value of C20 is provided for this special solution          (denoted by *).         4) The estimates from June 2013 through June 2014 have been updated.         The previous values were biased due to an error in the AOD1B model, which         has been corrected. The updated values are consistent with the re-released          RL05 solutions for these months.         5) The GRACE gravity solution from CSR for 'May 2015' actually         spans April 12, 2015 to May 11, 2015, due to the lack of         useful data in the latter half of May. A replacement value is          provided for this special solution (denoted by *).         6) The 'monthly' RL05 solutions from December 2015 onward will not necessarily          be based on GRACE data from just one month. The epoch of the C20 replacement will         be indicated by the same epoch of the data in the RL05 solution. As before, these          special cases will by denoted by *

GRACE Technical Note #07 February 2016

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created February 4, 2016 - last month reported is 'December 2015'. !!! PLEASE NOTE NEW COMMENT IN ITEM #6 !!! SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months. 5) The GRACE gravity solution from CSR for 'May 2015' actually spans April 12, 2015 to May 11, 2015, due to the lack of useful data in the latter half of May. A replacement value is provided for this special solution (denoted by *). 6) The 'monthly' RL05 solutions from December 2015 onward will not necessarily be based on GRACE data from just one month. The epoch of the C20 replacement will be indicated by the same epoch of the data in the RL05 solution. As before, these special cases will by denoted by *.

GRACE Technical Note #07 November_II 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created November 10, 2015 - last month reported is September 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months. 5) The GRACE gravity solution from CSR for 'May 2015' actually spans April 12, 2015 to May 11, 2015, due to the lack of useful data in the latter half of May. A replacement value is provided for this special solution (denoted by *).

GRACE Technical Note #07 November 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created November 4, 2015 - last month reported is September 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 September 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created September 9, 2015 - last month reported is July 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 May 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created May 4, 2015 - last month reported is March 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 April 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created April 10, 2015 - last month reported is February 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 February 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created February 18, 2015 - last month reported is January 2015. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 January 2015

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created January 12, 2015 - last month reported is November 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 December 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created December 4, 2014 - last month reported is October 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 November 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created November 8, 2014 - last month reported is September 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 October 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created September 23, 2014 - last month reported is June 2014. IMPORTANT! Please read Note 5 SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected. 5) The estimates from June 2013 through June 2014 have been updated. The previous values were biased due to an error in the AOD1B model, which has been corrected. The updated values are consistent with the re-released RL05 solutions for these months.

GRACE Technical Note #07 July_II 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created July 30, 2014 - last month reported is June 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

GRACE Technical Note #07 June 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created June 19, 2014 - last month reported is April 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

AOD1B Product Description Document for Product Release 05

Describes the atmospheric and oceanic de-aliasing product (AOD1B) for Release 05

GRACE Technical Note #07 May 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created May 7, 2014 - last month reported is March 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

AOD1B Product Description Document for Product Release 05

Describes the atmospheric and oceanic de-aliasing product (AOD1B) for Release 05

GRACE Technical Note #07 March 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created March 26, 2014 - last month reported is January 2014. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

GRACE Technical Note #07 January_2 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created January 28, 2014 - last month reported is December 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

GRACE Technical Note #07 January 2014

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created January 9, 2014 - last month reported is October 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

AOD1B Product Description Document for Product Release 05

Describes the atmospheric and oceanic de-aliasing product (AOD1B) for Release 05

GRACE Technical Note #07 August_2 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created August 27, 2013 - last month reported is July 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

GRACE Technical Note #07 August 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created August 5, 2013 - last month reported is June 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *). 4) A small error which affected some of the solutions for 2013 has been corrected.

GRACE Technical Note #07 July 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created July 16, 2013 - last month reported is May 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 June 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created June 7, 2013 - last month reported is April 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 May 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created May 1, 2013 - last month reported is March 2013. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 April 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created April 3, 2013 - last month reported is February 2013. SPECIAL NOTES:         Please use these estimates to replace the C20 values from the GSM         files of the GRACE RL05 products only. These estimates should not         be used with the GRACE RL04 or earlier products. In particular, a         rate for C20 has not been modeled for RL05, whereas a rate was         modeled for RL04.         1) The GRACE gravity solution from CSR for 'November 2011' actually         spans October 17, 2011 to November 16, 2011, due to the lack of         useful accelerometer data in the latter half of November. A         replacement value of C20 is provided for this special solution         (denoted by *) as well as for the full calendar month of November 2011.          2) The GRACE gravity solution from CSR for 'December 2011' actually         spans December 12, 2011 to January 11, 2012, due to the lack of         useful accelerometer data in the first half of December. A         replacement value of C20 is provided for this special solution         (denoted by *) as well as for the full calendar month of December 2011.          3) The GRACE gravity solution from CSR for 'April 2012' actually         spans March 20, 2012 to April 19, 2012, due to the lack of         useful accelerometer data in the latter half of April. A         replacement value of C20 is provided for this special solution          (denoted by *).

GRACE Technical Note #07 February 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created February 1, 2013 - last month reported is December 2012. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 January 2013

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created January 8, 2013 - last month reported is November 2012. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 October 2012

GRACE Technical Note 07 TITLE: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. UPDATE HISTORY: Created October 29, 2012 - last month reported is September 2012. SPECIAL NOTES: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011.? 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011.? 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution? (denoted by *).

GRACE Technical Note #07 September 2012

GRACE Technical Note 7: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 August 2012

GRACE Technical Note 7: Please use these estimates to replace the C20 values from the GSM files of the GRACE RL05 products only. These estimates should not be used with the GRACE RL04 or earlier products. In particular, a rate for C20 has not been modeled for RL05, whereas a rate was modeled for RL04. 1) The GRACE gravity solution from CSR for 'November 2011' actually spans October 17, 2011 to November 16, 2011, due to the lack of useful accelerometer data in the latter half of November. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of November 2011. 2) The GRACE gravity solution from CSR for 'December 2011' actually spans December 12, 2011 to January 11, 2012, due to the lack of useful accelerometer data in the first half of December. A replacement value of C20 is provided for this special solution (denoted by *) as well as for the full calendar month of December 2011. 3) The GRACE gravity solution from CSR for 'April 2012' actually spans March 20, 2012 to April 19, 2012, due to the lack of useful accelerometer data in the latter half of April. A replacement value of C20 is provided for this special solution (denoted by *).

GRACE Technical Note #07 Mai 2012

GRACE Technical Note 7: Monthly estimates of C20 from 5 SLR satellites based on GRACE RL05 models. Please note that this new TN07_MMDDYY.txt file is based on the new GRACE RL05 models and now supersedes the previous TN05_MMDDYY.txt files which were based on the now old GRACE RL04 models.

GRACE Technical Note #05 May 2012

TITLE: Monthly estimates of C20 from 5 SLR satellites UPDATE HISTORY: Updated May 3, 2012 - last month reported is February 2012.

GFZ Level-2 Processing Standards Document for Product Release 05

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 05 generated at GFZ.

GRACE Technical Note #05 February 2011

Updated February 14, 2011 - last month reported is December 2010.

GRACE Technical Note #05 January 2011

Updated January 10, 2011 - last month reported is October 2010.

GRACE Technical Note #05 July 2010

Updated July 5, 2010 - last month reported is May 2010.

GFZ L2 Processing Standards Document RL03

This document serves as a record of the processing standards, models & parameters adopted for the generation of the Level-2 gravity field data products by the GRACE Science Data System component at GeoForschungsZentrum Potsdam (GFZ).

Technical Note 04

Usage Guidelines for GFZ RL03 and JPL RL02 GRACE Gravity Fields & Atmosphere/Ocean Background Models

Release Notes for JPL RL02 GRACE L2 products

Gives additional information on JPL RL02 GRACE L2 products (not contained in JPL RL02 processing standards document).

Release Notes for CSR RL01 GRACE L2 products

Gives additional information on CSR RL01 GRACE L2 products (not contained in CSR RL01 processing standards document).

JPL Level-2 Processing Standards Document for Product Release 02

Describes the processing standards, models, and parameter adopted for the Level-2 Product Release 02 generated at JPL.

CSR Level-2 Processing Standards Document for Product Release 01

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 01 generated at CSR.

AOD1B Product Description Document

Describes the atmospheric and ocean de-aliasing product (AOD1B) and the barotropic or baroclinic ocean model output (OCN1B).

Product Descriptions

GX-OG-_2-GSM

Static Field Geopotential Coefficients estimated from Satellite Data only Spherical harmonic coefficients and standard deviations of the static gravity field estimated from GRACE satellite instrument data only for a dedicated time font and spatial resolution, (1 file per time font, level-2 format)

GX-OG-_2-GCM

Static Field Geopotential Coefficients estimated from Satellite and Surface Data Information Spherical harmonic coefficients and standard deviations of the static gravity field estimated by combination of GRACE satellite instrument data and other information for a dedicated time font and spatial resolution, (1 file per time font, level-2 format)

GX-OG-_2-GAB

Non-tidal Ocean Geopotential Coefficients averaged over certain Time font Non-tidal ocean spherical harmonic coefficients provided as average over certain time font (see filename) based on level-1 AOD1B/ATMOCN product (1 file per time font, level-2 format)

GX-OG-_2-GAA

Non-tidal Atmosphere Geopotential Coefficients averaged over certain Time font Non-tidal atmosphere spherical harmonic coefficients provided as average over certain time font (see filename) based on level-1 AOD1B/ATMOCN product (1 file per time font, level-2 format)

GX-OG-1B-OCNBAT

Barotropic sea level data (OCN1B) 1-hourly, 1.125? grids of barotropic sea level determined from JPL barotropic ocean model (1 file per day, OCN1B- format)

GX-OG-1B-KBRDAT

GRACE-A or GRACE-B Level-1B k-band ranging data (KBR1B) Preprocessed and calibrated k-band ranging data (range, range-rate and range-acceleration) edited and decimated from instrument high-rate (0.1 s) to low-rate (5 s) samples for science use (1 file per day, level-1 format)

GX-OG-1B-ATMOCN

Atmosphere and ocean de-aliasing coefficients (AOD1B) Spherical harmonic expansion of combined barotropic sea level and vertical integrated pressure at 6 hour sample rate (1 file per day, level-1 format)

GA/B-OG-1B-VOSLRR

GRACE-A or GRACE-B Level-1B SLR reflector vector data (VSL1B) Calibrated GRACE-A or GRACE-B Level-1B vector offset file for SLR reflector in science reference frame

GA/B-OG-1B-VOKBPC

GRACE-A or GRACE-B Level-1B K-band antenna vector data (VKB1B) Calibrated vector offset file for K-band antenna k and ka phase centers in science reference frame

GA/B-OG-1B-VOGPSO

GRACE-A or GRACE-B Level-1B GPS occultation antenna vector data (VGO1B) Calibrated vector offset file for GPS occultation antenna L1 and L2 phase centers in science reference frame

GA/B-OG-1B-VOGPSN

GRACE-A or GRACE-B Level-1B GPS navigation antenna vector data (VGN1B) Calibrated vector offset file for GPS navigation antenna L1 and L2 phase centers in science reference frame

GA/B-OG-1B-VOGPSB

GRACE-A or GRACE-B Level-1B GPS backup antenna vector data (VGB1B) Calibrated vector offset file for GPS backup antenna L1 and L2 phase centers in science reference frame

GA/B-OG-1B-VOCOMS

GRACE-A or GRACE-B Level-1B center of mass vector data (VCM1B) Calibrated vector offset file for satellite center of mass in science reference frame

GA/B-OG-1B-USODAT

GRACE-A or GRACE-B Level-1B oscillator frequency data (USO1B) Oscillator frequency data derived from POD product

GA/B-OG-1B-TNKDAT

GRACE-A or GRACE-B Level-1B tank data (TNK1B) GN2 tank temperature and pressure data

GA/B-OG-1B-THRDAT

GRACE-A or GRACE-B Level-1B thruster activation data (THR1B) GN2 thruster data used for attitude (10 mN) and orbit (40 mN) control

GA/B-OG-1B-SCAATT

GRACE-A or GRACE-B Level-1B star camera data (SCA1B) Preprocessed and calibrated star camera quaternion data edited and decimated from instrument high-rate (1 s) to low-rate (5 s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-RSCTSR

GRACE-A or GRACE-B Level-1B rotation from star camera frame to science reference frame (QSA1B) Calibrated GRACE-A or GRACE-B Level-1B rotation from star camera frame to science reference frame provided as quaternion data (1 file per mission, level-1 format)

GA/B-OG-1B-RSCTKB

GRACE-A or GRACE-B Level-1B rotation from star camera frame to k-band frame (QKS1B) Calibrated GRACE-A or GRACE-B Level-1B rotation from star camera frame to k-band frame provided as quaternion data (1 file per mission, level-1 format)

GA/B-OG-1B-RSBTSR

GRACE-A or GRACE-B Level-1B rotation from satellite body frame to science reference frame (QSB1B) Calibrated GRACE-A or GRACE-B Level-1B rotation from satellite body to science reference frame provided as quaternion data (1 file per mission, level-1 format)

GA/B-OG-1B-OBDHTM

GRACE-A or GRACE-B Level-1B OBDH time mapping data (TIM1B) On-board data handling (OBDH) time mapping data (OBDH time to receiver time)

GA/B-OG-1B-NAVSOL

GRACE-A or GRACE-B Level-1B GPS navigation data (GNV1B) GPS navigation data edited and decimated from instrument high-rate (60 s) to low-rate (30 s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-MASDAT

GRACE-A or GRACE-B Level-1B mass estimate data (MAS1B) Mass estimate data based on thruster or tank sensor data edited and decimated from instrument high-rate (TBD s) to low-rate (60 s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-MAGDAT

GRACE-A or GRACE-B Level-1B magnetometer and magnetorquer data (MAG1B) Preprocessed and calibrated magnetometer and magnetorquer data edited and decimated from instrument high-rate (TBD s) to low-rate (60 s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-IPUHKP

GRACE-A or GRACE-B Level-1B IPU housekeeping data (IHK1B) Instrument processing unit (IPU) housekeeping data edited and decimated from high-rate (TBD s) to low-rate (TBD s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-INTCLK

GRACE-A or GRACE-B Level-1B intermediate clock solution (tdP1B) Intermediate clock solution derived with GIPSY POD software (300 s sample rate) (1 file per day, GIPSY format)

GA/B-OG-1B-GPSDAT

GRACE-A or GRACE-B Level-1B GPS tracking data (GPS1B) Preprocessed and calibrated GPS code and phase tracking data edited and decimated from instrument high-rate (10 s (code) or 1 s (phase)) to low-rate (10 s) samples for science use (1 file per day, level-1 format)

GA/B-OG-1B-CLKDAT

GRACE-A or GRACE-B Level-1B clock conversion parameters (CLK1B) Clock conversion parameters from receiver to GPS time at 30 sec sample rate (1 file per day, level-1 format)

GA/B-OG-1B-ACCHKP

GRACE-A or GRACE-B Level-1B accelerometer housekeeping data (AHK1B) Proof-mass bias voltages, capacitive sensor outputs, instrument control unit (ICU) and sensor unit (SU) temperatures, reference voltages, primary and secondary power supply voltages (1 file per day, level-1 format)

GA/B-OG-1B-ACCDAT

GRACE-A or GRACE-B Level-1B accelerometer data (ACC1B) Preprocessed and calibrated accelerometer data edited and decimated from instrument high-rate (0.1 s) to low-rate (1s) samples for science use (1 file per day, level-1 format)

Reference Documents

Simulation Study of a Low-Low Satellite-to-Satellite Tracking Mission

Simulation Study of a Low-Low Satellite-to-Satellite Tracking Mission

Software

GraceReadSW_L1_2010-03-31

GraceReadSW_L1_2010-03-31 This software replaces the old "GraceReadSW_L1_2008-03-20" software. Currently the Read software has been updated to accommodate 64-bit machines but the software will also work on 32 bit machines.

GraceReadSW_L1_2008-03-20

GraceReadSW_L1_2008-03-20 This software replaces the old "GraceReadSW_L1_2004-01-22" software. SPECIAL NOTE ON GPS-PRN32 and LEVEL-1 READ SOFTWARE The GPS satellite PRN32 (SVN23) was set "healthy" as of Feb 26, 2008. Tracking of this satellite was therefore enabled on GRACE. The Level-1B data since Feb 26, 2008 contains GPS tracking data from PRN32. The software to convert from GRACE GPS1x format to Rinex format has been updated to handle the presence of data from PRN32. Users should download and re-install the entire Level-1 Read software suite (RELEASE_2008-03-20) from the GRACE archives. This software is backwards compatible and can process all mission data.

read_sw_for_OCN1B_20040415

read_sw_for_OCN1B_20040415
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(update: 2018-06-20 04:30:01)