Accounting for GIA signal in GRACE products

Vishwakarma, BD and Horwath, M and Groh, A and Bamber, JL (2022) Accounting for GIA signal in GRACE products. In: Geophysical Journal International, 228 (3). pp. 2056-2060.

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Abstract

The Gravity Recovery and Climate Experiment (GRACE) observes gravitational potential anomalies that include the effects of present-day surface mass change (PDSMC)-and glacial isostatic adjustment (GIA)-driven solid Earth mass redistribution. Therefore, GIA estimates from a forward model are commonly removed from GRACE to estimate PDSMC. There are several GIA models and to facilitate users in using a GIA model of their choice, both GRACE and GIA products are made available in terms of global gridded fields representing mass anomaly. GRACE-observed gravitational potential anomalies are represented in terms of equivalent water height (EWH) with a relation that accounts for an elastic solid Earth deformation due to PDSMC. However, for obtaining GIA EWH fields from GIA gravitational potential fields, two relations are being used: one that is similar to that being used for GRACE EWH and the other that does not include an elastic deformation effect. This leaves users with the possibility of obtaining different values for PDSMC with a given GRACE and GIA field. In this paper, we discuss the impact of this problem on regional mass change estimates and highlight the need for consistent treatment of GIA signals in GRACE observations. © 2021 The Author(s) 2021. Published by Oxford University Press.

Item Type:	Journal Article
Publication:	Geophysical Journal International
Publisher:	Oxford University Press
Additional Information:	The copyright for this article belongs to Oxford University Press
Keywords:	Climate change; Earth (planet); Geodesy; Gravitation, Glacial isostatic adjustment models; Glacial Isostatic Adjustments; Global change from geodesies; Gravitational potential; Gravity recovery and climate experiments; Mass change; Satellite geodesy; Surface mass; Time-variable gravity; Water heights, Geodetic satellites
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research
Date Deposited:	20 Jan 2022 06:35
Last Modified:	20 Jan 2022 06:35
URI:	http://eprints.iisc.ac.in/id/eprint/70966

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