Tuesday 23 August 2005

G2
1000-1225 hours

120
Characterization of moving-window GRACE global gravity field solutions
Bettadpur, Srinivas¹, Bonin, Jennifer¹, Gunter, Brian¹, Poole, Steven¹, Ries, John¹
1 Center for Space Research, The University of Texas at Austin, USA
Author email: srinivas@csr.utexas.edu
The Gravity Recovery And Climate Experiment was launched on Mar 17, 2002 in order to measure mass flux within the Earth system through its effects on Earth's gravity field. Since that time, using the inter-satellite tracking data between the twin GRACE satellites, piecewise constant monthly global gravity field estimates have been delivered to the user community, and these fields have shown clear evidence of hydrological, oceanographic & glaciological phenomena. This paper discusses the results of early experiments to improve the time resolution of the GRACE global gravity field product. We discuss the signals evident in solutions generated using a sliding window of GRACE data. In particular, we disucss the statistical error characteristics of such sliding window solutions with changing window width and window shift. These results form the basis for design of GRACE data processing schemes and for the interpretation of future GRACE results.

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