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Main / GRACE / Frequently Updated Documents: Technical Notes

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  GRACE Technical Note #07 May 2016 
Description: 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 *.
Filesize: 14.36 KB
Added on: 11-May-2016
Author: M. Cheng & J. Ries
Downloads: 507
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #10 December 2015 
Description: 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.
Filesize: 83.17 KB
Added on: 15-Dec-2015
Author: F. Flechtner, H. Dobslaw, E. Fagiolini
Downloads: 548
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #09 April 2014 
Description: 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.
Filesize: 558.94 KB
Added on: 14-Apr-2014
Author: F. Flechtner, H. Dobslaw, E. Fagiolini
Downloads: 906
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #08 April 2014 
Description: 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.
Filesize: 558.95 KB
Added on: 14-Apr-2014
Author: F. Flechtner, H. Dobslaw, E. Fagiolini
Downloads: 814
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

   GRACE Technical Note #05 June 2012 
Description: 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.
Filesize: 10.05 KB
Added on: 25-Jun-2012
Author: M. Cheng& J. Ries
Downloads: 1054
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #02: ACC biases (pdf-Format) 
Description: Recommendation for a-priori Bias & Scale Parameters for Level-1B ACC Data (Version 2)
Filesize: 116.28 KB
Added on: 19-Jun-2009
Author: S. Bettadpur
Downloads: 1959
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note 06 
Description: Impact of change in AOD1B on RL04
Filesize: 1.08 MB
Added on: 04-Mar-2008
Author: Srinivas Bettadpur
Downloads: 6297
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #04: Usage guidelines for GFZ RL03 and JPL RL02 GRACE 
Description: gravity fields & atmosphere/ocean background models

Provides detailed guidelines for usage on GFZ RL03 and JPL RL02 GRACE models.
Filesize: 583.19 KB
Added on: 15-May-2007
Author: S. Bettadpur, F. Flechtner, R. Schmidt
Downloads: 1827
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #03: Sequence of Events (SOE) format description 
Description: Provides a detailed description and format information on how the SOE file is organized.
Version: N.A.
Filesize: 15.13 KB
Added on: 28-Apr-2006
Author: G. Kruizinga
Downloads: 1842
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

  GRACE Technical Note #01: Sequence of Events (SOE) File 
Description: 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.
Version: N.A.
Filesize: 353.53 KB
Added on: 15-Sep-2005
Author:
Downloads: 2599
Category: GRACE / Frequently Updated Documents: Technical Notes
Details

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