The PO.DAAC is pleased to announce the public release of the JPL TELLUS GRACE/GRACE-FO Level-3 Glacial Isostatic Adjustment (GIA) v1.0 datasets. The GRACE mission, a joint partnership between NASA (USA) and the DLR (Germany), launched on 17 March 2002, and operated through June 2017. On 22 May, 2018, NASA and the German Research Centre for Geosciences (GFZ) launched the GRACE Follow-On mission to continue the global data record of mass change. Both missions use twin satellites to accurately map month-to-month variations in the Earth's gravity field and surface mass distribution. Detailed information regarding the GRACE and GRACE-FO mission is available from the project GRACE / GRACE-FO websites and also the PO.DAAC GRACE / GRACE-FO mission webpages.
The glacial isostatic adjustment (GIA) is an ongoing geophysical process and is measured by gravimetry satellites like GRACE and GRACE-FO. To isolate signals of contemporary surface mass loss in the cumulative satellite gravimetry measurements, contemporary GIA rates are computed and subtracted from the satellite gravimetry observations. The TELLUS GIA v1.0 datasets, first version in NetCDf format has replaced the retired ASCII Post Glacial Rebound (PGR) datasets (DOI: 10.5067/TELND-PGTX1). This release includes GRACE/GRACE-FO compatible products derived from three different GIA models (CARON_M5L-LIJ, WAHR_ICE5G, and PELTIER_ICE6G-D). The provided global data products are mapped into feature resolutions that are compatible with currently provided JPL TELLUS Level-3 GRACE and GRACE-FO fields (i.e., JPL Mascon, OCN 500km, LND 300km). With these grids, users can effectively ‘undo’ the applied TELLUS GIA corrections and swap in GIA models of their choice (e.g., to assess the sensitivity of a regional mass change to the applied GIA correction).
The datasets are described and discoverable via the PO.DAAC dataset information pages. The dataset information pages also provide access to the technical documentation, and guidance on how to cite the data.
1. A, G., J. Wahr, and S. Zhong (2013), Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica and Canada, Geophys. J. Int., 192, 557–572, doi:10.1093/gji/ggs030
2. Caron, L., E.R. Ivins, E. Larour, S. Adhikari, J. Nilsson, and G. Blewitt, (2018), GIA model statistics for GRACE hydrology, cryosphere and ocean science, Geophys. Res. Lett., 45, doi:10.1002/2017GL076644
3. Peltier, W. R., D. F. Argus, and R. Drummond (2018), Comment on the paper by Purcell et al. 2016 entitled An assessment of ICE-6G_C (VM5a) glacial isostatic adjustment model, J. Geophys. Res. Solid Earth, 122, doi:10.1002/2016JB013844