GRACE-FO Mission Documentation

General Documentation

F. Landerer, et al.

Monthly newsletter provided by the GRACE-FO Science Data System (SDS) describing science relevant events on the GRACE-FO space crafts and statistics on L0, L1 and L2 product generation.

GRACE-GRACE-FO Months RL06.cvs

NASA/JPL

Actual monthly-range of the valid data used to compute the GRACE and GRACE-FO Level-2 and -3 monthly products.

NASA Approved YAML encoding technical note

NASA/JPL

Document that describes the "YAML Ain't Markup Language" (YAML) encoding as the standard format for NASA GRACE/GRACE-FO mission ASCII data.

Level 1 Documentation

AOD1B Product Description Document GRACE H. Dobslaw, et al. Date: October 19, 2017	Describes the atmospheric and ocean de-aliasing product (AOD1B) and the barotropic ocean model output (OCN1B).
GRACE-FO Level 1 Data Product User Handbook Hui Ying Wen, et al. Date: Sept. 11, 2019	Provides a comprehensive description of the content and format of the GRACE-FO SDS Level-1A and 1B data products.
Release Notes for GRACE-FO L1B products Hui Ying Wen Date: Sept. 23, 2019	Gives additional information on GRACE-FO L1B products (not contained in other L1 documents).
GRACE-FO Accelerometer Data Products Christopher M. M. Date: May 20, 2019	Provides the accelerometer data, which is calibrated to enable more optimal gravity field recovery.

Level-2 Documentation

GRACE-FO Level-2 Gravity Field Product User Handbook Dah-Ning Yuan Date: May 22, 2019	The GRACE Follow-On Level-2 Gravity Field Product User Handbook provides a description of the Earth gravity field estimates provided by the Level-2 processing. In particular, the relationship of the abstract concept of the geopotential, its instantaneous and mean values, and the specific set of GRACE Follow-On gravity estimates is described in this document.
CSR GRACE-FO L2 Processing Standards Document RL06 H. Save Date: June 6 2019	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 FollowOn (GRACE-FO) Science Data System component at The University of Texas Center for Space Research (UTCSR).
GFZ GRACE-FO L2 Processing Standards Document RL06 C. Dahle et al. Date: June 3 2019	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-FO Science Data System component at the GFZ German Research Centre for Geosciences.
JPL GRACE-FO L2 Processing Standards Document RL06 D.-N. Yuan Date: May 28 2019	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 Follow-On Science Data System component at NASA Jet Propulsion Laboratory of the California Institute of Technology (JPL).
Release Notes for JPL GRACE-FO L2 RL06.3 products	Information on JPL GRACE-FO Level-2 RL06.3 products
Release Notes for CSR GRACE-FO L2 RL06.3 products	Information on CSR GRACE-FO Level-2 RL06.3 products
Release Notes for GFZ GRACE-FO L2 RL06.3 products	Information on GFZ GRACE-FO Level-2 RL06.3 products

Level-3 Documentation

GRACE-FO Level-3 Data Product User Handbook

Savannah S. Cooley and Felix W. Landerer
Date: July 10, 2020

This Handbook is designed to guide both experienced and beginner users in understanding and using Level-3 GRACE and GRACE-FO data products.The three main objectives of this document are to, 1) provide an overview of the GRACE-FO mission including the instrument design, science data processing, and calibration and validation procedures, 2) provide a description of the available Level-3 GRACE-FO data products and featured science and applications of Level-3 GRACE and GRACE-FO data, and 3) provide a set of step by step, reproducible use cases intended to serve as a reference for users who are interested in GRACE-FO Level-3 data products.

Release Notes for JPL GRACE-FO L3 MASCON RL06.3 products

David Wiese
Date: September 10, 2024

Information on Release 06.3 of the Level-3 MASCON data sets.

Technical Notes

GRACE-FO Technical Note #01: Sequence of Events (SOE) File Updated Daily	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.
GRACE-FO Technical Note #01a: SPACECRAFT_EVENTS (SCE) File NASA/JPL	This file contains GRACE-FO SPACECRAFT_EVENTS, manually written by Level-1 Science Data System operators at NASA JPL, and updated with each weekly incremental data release. The contents of this file augment the machine-readable Sequence of Events file
GRACE-FO Technical Note #01b: KBR_GPS_Stats NASA/JPL	KBR_GPS Status Report
GRACE-FO Technical Note #11E: Monthly estimates of C20 and C30 from 6/7 satellites based on GRACE RL06 models Authors: M. Cheng and J. Ries Date: January 25, 2023	Use these estimates to replace the C20 values (and C30 values starting March 2012) from the GSM files of the GRACE(-FO) RL06.X products only. These estimates are not intended to be used with the GRACE RL05 or earlier products.
GRACE-FO Technical Note #12: Convert Global Mean OBP -> Global Mean Ocean Mass Date: July, 2020	This calculation uses AOD1B 'GAC' fields, and integrates over the ocean-area only; due to the definition of 'GAC' (see AOD1B handbook for further details), the resulting mean value effectively represents 'mean atmospheric mass over the global ocean' for each time step.
GRACE-FO Technical Note #13a: degree-1 (geocenter) gravity coefficients from CSR RL06.3	This file contains monthly estimates of degree-1 gravity coefficients for the GRACE/GRACE-FO Release-06.3 data by CSR, based on ocean and atmospheric models and GRACE/GRACE-FO coefficients for degrees 2 and higher.
GRACE-FO Technical Note #13b: degree-1 (geocenter) gravity coefficients from GFZ RL06.3	This file contains monthly estimates of degree-1 gravity coefficients for the GRACE/GRACE-FO Release-06.3 data by GFZ, based on ocean and atmospheric models and GRACE/GRACE-FO coefficients for degrees 2 and higher.
GRACE-FO Technical Note #13c: degree-1 (geocenter) gravity coefficients from JPL RL06.3	This file contains monthly estimates of degree-1 gravity coefficients for the GRACE/GRACE-FO Release-06.3 data by JPL, based on ocean and atmospheric models and GRACE/GRACE-FO coefficients for degrees 2 and higher.
GRACE-FO Technical Note #14: NASA GSFC SLR C20 and C30 solutions B.D. Loomis and K.E. Rachlin	This file contains SLR-derived C20 and C30 values for replacing GRACE/GRACE-FO GSM Values prior to MJD 56006 use 5 satellites: LAGEOS-1/2, Stella, Starlette, AJISAI Values beginning on MJD 56006 use 7 atellites: LARES and Larets added C30 values are not provided prior to MJD 56006 Estimated parameters for both 5 and 7-satellite configurations: 5x5+C61,S61
Missing and and Unused Days Table	CSV table of missing days for GRACE and GRACE-FO processing. Includes monthly information on missing days as well as unused days by each of the processing centers.

DATA ALERT: Anomaly affecting the OPERA DSWx-S1 product: OPERA has discovered a processing error affecting DSWx-S1 data products generated from May 2025 onwards. This error is causing Sentinel-1A (S1A) and Sentinel-1C (S1C) data to be incorrectly mixed into a single product.

This issue is currently under investigation by the OPERA team. As a precaution, the OPERA team has temporarily stopped the production of DSWx-S1 while they resolve this matter. We will provide more information as soon as it becomes available. We apologize for any inconvenience this may cause.

PO.DAAC

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