Mon Aug 24, F. Flechtner
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Choubey, Saurabh, Chander, Shard, and Kumari, Rina, 2026. GRACE and GRACE Follow On: On Accurate estimation of Groundwater Storage Change from Satellite Gravimetry and Beyond. ISPRS – International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 49B3:783–788, doi:10.5194/isprs-archives-XLIX-B3-2026-783-2026.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026ISPAr49B3..783C,
author = {{Choubey}, Saurabh and {Chander}, Shard and {Kumari}, Rina},
title = "{GRACE and GRACE Follow On: On Accurate estimation of Groundwater Storage Change from Satellite Gravimetry and Beyond}",
journal = {ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences},
year = 2026,
month = jul,
volume = {49B3},
pages = {783-788},
abstract = "{The present work focused on the synergistic utilization of Gravity
Recovery and Climate Experiment (GRACE) and GRACE-Follow On (FO)
derived Ensemble Terrestrial Water Storage Anomaly (TWSA) from
Jet Propulsion Lab (JPL), Centre for Space Research (CSR) and
Goddard Space Flight Centre (GSFC), downscaled (GOU) TWSA and a
gap filled JPL TWSA data and other hydrological variables to
assess variability in groundwater storage (GWS) change in the
last two decades (2002-2022) over Indus and Ganga river basins.
The Indus basin witnessed a significant decline with a rate of
change between -2.11 to -3.0 cm/yr and Ganga basin witnessed a
significant decline of -1.27 cm/yr to -1.88 cm/yr after removing
soil moisture estimates respectively. GWSA obtained from
downscaled TWSA also indicated a significant negative trend.
However, the magnitude of trend was considerably lower (0.9
cm/yr) than the ensemble (-1.27 cm/yr) and gap filled (-1.88
cm/yr) datasets. Ground observations also indicated a decline in
GWSA in the Ganga basin with a rate of change -0.26 cm/yr.
Validation of results with in-situ well data showed highest
positive correlation (R = 0.78) and least Root Mean Squared
Error (RMSE = 17.5 cm) with in-situ GWSA in the Indus basin
during 2002-2022. Downscaling of GRACE TWSA employing self-
supervised data assimilation can significantly reduce the
general overestimation of trends in GWSA computed from GRACE and
GRACE FO observations.}",
doi = {10.5194/isprs-archives-XLIX-B3-2026-783-2026},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026ISPAr49B3..783C},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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