The updated RL06.3 Level-2 gravity fields improve the low-degree harmonics time series, and the corresponding Level-3 mass change fields.

The GRACE-FO Science Data System team at JPL, GFZ and CSR has reprocessed the Level-1 ACC data and released a new Level-1B ACX2 data product. ACX2 is an imporved hybrid ACC-transplant that uses observations from both the GF1 and GF2 accelerometers. With this, we can better account for differential non-gravitational forces between GF1 and GF2 – which in turn results in the improved monthly gravity fields.

The ACX2-L1B product requires significantly more validation and verification during its production. These data will be delivered in a delayed mode, together with the corresponding monthly L2/L3 data deliveries (current latency: ~40-60 days).

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The 2024 GRACE-FO Science Team Meeting took place Oct 8-10, 2024 at GFZ (Potsdam, Germany).

Overall, >65 papers were presented and discussed, and can be accessed through the meeting website.

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The updated RL06.1 Level-2 gravity fields improve the low-degree harmonics time series, and the corresponding Level-3 mass change fields (e.g., over Antarctica).

The GRACE-FO Science Data System team at JPL, GFZ and CSR has reprocessed the Level-1 ACC data and released a new Level-1B ACX data product. ACX is an updated hybrid ACC-transplant that uses observations from both the GF1 and GF2 accelerometers. With this, we can better account for differential non-gravitational forces between GF1 and GF2 – which in turn results in the improved monthly gravity fields.

The ACX-L1B product requires significantly more validation and verification during its production. While the SDS team will strive to adhere to the weekly Level-1 delivery schedule, we anticipate that at least initially, ACX-L1B will be delivered in a delayed mode, together with the corresponding monthly L2/L3 data deliveries (current latency: ~40 days).

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The GRACE-FO Science Data System team has published a mission baseline reference paper, characterizing the instrument, flight system and science data performance over the first two years since launch:

Landerer, F. W., Flechtner, F. M., Save, H., Webb, F. H., Bandikova, T., Bertiger, W. I., et al. (2020). Extending the global mass change data record: GRACE Follow‐On instrument and science data performance. Geophysical Research Letters, 47, e2020GL088306. https://doi.org/10.1029/2020GL088306

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JPL has released its latest Level-3 Mascon data products, spanning the entire GRACE mission duration: 04/2002 - 07/2017, as well as GRACE-FO (06/2018 - current). Follow link above for details and download links.

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JPL has released it's latest Mascon data products, spanning the entire GRACE mission duration: 04/2002 - 07/2017. Follow link above for details and download links. less

We are happy to announce our new interactive GRACE Data Analysis Tool. You can now interactively visualize GRACE Level-3 data, including hydrology basin averages, and users can download the corresponding time series. This tool will expand over time - please let us know what additional features and functionalities would help you in your analysis and applications of GRACE and GRACE Follow-On data! less

The GRACE Project's data centers (JPL, CSR, GFZ) have released the first batch of reprocessed RL06 Level-2 data (spanning 04/2002 through 08/2016). The corresponding grids of Level-3 data (terrestrial water storage, ocean bottom pressure), as well as ancillary files (e.g., geocenter, GIA) are currently being assessed and will be released by the end of August, 2018. less

While the GRACE satellites delivered their last (as in: final!) ranging data for gravity field processing in June 2017, the science data system has not been idle. JPL, CSR and GFZ are actively working on reprocessing the entire GRACE data set (04/2002 - 06/2017) with revised data editing and parameterization, updated AOD1B background models, reprocessed Level-1B (KBR & SCA) data, updated tide models, and other improvements in force models. We expect to finish this reprocessing in Spring 2018. In addition to RL06, the processing teams continue to evaluate and improve the so-called 'ACC transplant' data months of 2017, when only a single accelerometer was available. While this patch enabled us to process gravity fields, the noise levels are currently noticeably higher than during nominal months. With some additional analysis, we are cautiously optimistic that we can improve upon this lower S/N ratio - stay tuned for updates! less

Please visit the JPL Mascson data page for more information on the Version-2 data processing changes, and links to the JPL Mascon data grids (via JPL-PO.DAAC). NOTE: make sure to check the Release Notes for important details on data processing and uncertainties since mid-2016! less

Please note there are several missing consecutive weeks due to 'active battery management' starting in 2011. These outages occur approximately every 6 months, and last 4-8 weeks. During those times, science instruments vital to measure the gravity field (e.g., MWA) are switched off, and no Level-2 or Level-3 data is available. Additionally, since 10/2016, GRACE-1 continues to collect nominal science data as before, but the accelerometer on GRACE-2 is turned off. Analysis is underway to evaluate Level-2 and Level-3 data products with these constraints. Please check back for updates. less

Please visit the JPL Mascson data page for more information on the Version-2 data processing changes, and links to the data grids (via JPL-PO.DAAC). less

GRACE Ocean Bottom Pressure grids (JPL, CSR, GFZ) are now available through 03/2016. Please visit the Ocean grid data page for more details and links to the data files. less

GRACE Total Land Water Storage grids (JPL, CSR, GFZ) are now available through 07/2016. Please visit the Land grid data page for more details and links to the data. NOTE: Please look at the GRACE Status updates for important information on data schedule, recent data quality, and mission operations! less

Please visit the JPL Mascson data page for more information on the data processing, and links to the data grids (via JPL-PO.DAAC). less