A comparison of coincident GRACE and ICESat data over Antarctica |
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| Authors: | Brian Gunter T Urban R Riva M Helsen R Harpold S Poole P Nagel B Schutz B Tapley |
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| Institution: | (1) Delft Institute of Earth Observation and Space Systems (DEOS), Delft University of Technology, Delft, 2629HS, The Netherlands;(2) Center for Space Research (CSR), The University of Texas at Austin, Austin, TX 78759, USA;(3) Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Utrecht, 3584CC, The Netherlands |
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| Abstract: | In this study, we present a comparison of coincident GRACE and ICESat data over Antarctica. The analysis focused on the secular
changes over a 4-year period spanning from 2003 to 2007, using the recently reprocessed and publicly available data sets for
both missions. The results show that the two independent data sets possess strong spatial correlations, but that there are
several factors that can significantly impact the total derived ice mass variability from both missions. For GRACE, the primary
source of uncertainty comes from the modelling of glacial isostatic adjustment, along with the estimates of C
2,0 and the degree one terms. For ICESat, it is shown that assumptions about firn density, rate biases, and the sampling interval
of the various laser campaigns can have large effects on the results. Despite these uncertainties, the similarities that do
exist indicate a strong potential for the future refinement of both GIA and mass balance estimates of Antarctica. |
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