Journal of Geodesy

, Volume 83, Issue 11, pp 1051–1060

A comparison of coincident GRACE and ICESat data over Antarctica

  • Brian Gunter
  • T. Urban
  • R. Riva
  • M. Helsen
  • R. Harpold
  • S. Poole
  • P. Nagel
  • B. Schutz
  • B. Tapley
Open AccessOriginal Article

DOI: 10.1007/s00190-009-0323-4

Cite this article as:
Gunter, B., Urban, T., Riva, R. et al. J Geod (2009) 83: 1051. doi:10.1007/s00190-009-0323-4

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 C2,0 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.

Keywords

GRACEICESatAntarcticaIce mass changeGlacial isostatic adjustment (GIA)
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Copyright information

© The Author(s) 2009

Authors and Affiliations

  • Brian Gunter
    • 1
  • T. Urban
    • 2
  • R. Riva
    • 1
  • M. Helsen
    • 3
  • R. Harpold
    • 2
  • S. Poole
    • 2
  • P. Nagel
    • 2
  • B. Schutz
    • 2
  • B. Tapley
    • 2
  1. 1.Delft Institute of Earth Observation and Space Systems (DEOS)Delft University of TechnologyDelftThe Netherlands
  2. 2.Center for Space ResearchThe University of Texas at AustinAustinUSA
  3. 3.Institute for Marine and Atmospheric Research Utrecht (IMAU)Utrecht UniversityUtrechtThe Netherlands