Present-day West Antarctic ice-mass change estimate by the constrained 
inversion of GRACE and InSAR data

Sasgen, Ingo; Martinec, Z.; Bamber, J.; 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

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Present-day West Antarctic ice-mass change estimate by the constrained inversion of GRACE and InSAR data

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Sasgen, Ingo
Deutsches GeoForschungsZentrum;

Martinec, Z.
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Bamber, J.
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Sasgen, I., Martinec, Z., Bamber, J. (2008): Present-day West Antarctic ice-mass change estimate by the constrained inversion of GRACE and InSAR data, (Eos, Transactions, American Geophysical Union, Suppl.; 89, 53), AGU 2008 Fall Meeting. (San Francisco, USA 2008).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_238006

Abstract

We estimate the ice-mass loss in West Antarctica from the Gravity Recovery and Climate Experiment (GRACE) using an inverse gravimetric approach. The inversion is constrained by the InSAR data to minimize the ambiguity of the resulting mass estimates. We determine the spatial resolution of GRACE over Antarctica and use it to calculate unconstrained (GRACE only) mass balance estimates for a reduced number of drainage basins. We compare InSAR, constrained and unconstrained mass change rates, estimate their uncertainties and discuss the influence of glacial-isostatic adjustment on our results.