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Separating GIA signal from surface mass change using GPS and GRACE data

Vishwakarma, BD and Ziegler, Y and Bamber, JL and Royston, S (2023) Separating GIA signal from surface mass change using GPS and GRACE data. In: Geophysical Journal International, 232 (1). pp. 537-547.

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Official URL: https://doi.org/10.1093/gji/ggac336


The visco-elastic response of the solid Earth to the past glacial cycles and the present-day surface mass change (PDSMC) are detected by the geodetic observation systems such as global navigation satellite system and satellite gravimetry. Majority of the contemporary PDSMC is driven by climate change and in order to better understand them using the aforementioned geodetic observations, glacial isostatic adjustment (GIA) signal should be accounted first. The default approach is to use forward GIA models that use uncertain ice-load history and approximate Earth rheology to predict GIA, yielding large uncertainties. The proliferation of contemporary, global, geodetic observations and their coverage have therefore enabled estimation of data-driven GIA solutions. A novel framework is presented that uses geophysical relations between the vertical land motion (VLM) and geopotential anomaly due to GIA and PDSMC to express GPS VLM trends and GRACE geopotential trends as a function of either GIA or PDSMC, which can be easily solved using least-squares regression. The GIA estimates are data-driven and differ significantly from forward models over Alaska and Greenland. © 2022 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society.

Item Type: Journal Article
Publication: Geophysical Journal International
Publisher: Oxford University Press
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Climate change; Geodesy; Geodetic satellites; Glacial geology; Gravitation, Data driven; Geodetic observation; Geopotential theories; Glacial Isostatic Adjustments; Global change from geodesies; Loading of the earth; Mass change; Satellite gravity; Surface mass; Vertical land motions, Global positioning system
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research
Date Deposited: 27 Jan 2023 08:56
Last Modified: 27 Jan 2023 08:56
URI: https://eprints.iisc.ac.in/id/eprint/79538

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