HR: 13:55h
AN: G23A-02 INVITED     [Abstracts]
TI: Assessment of GRACE Time-Variable Gravity over the Ocean
AU: * Chambers, D P
EM: chambers@csr.utexas.edu
AF: Center for Space Research, The University of Texas at Austin 3925 W. Braker Lane, Suite 200, Austin, TX 78759 United States
AB: Monthly time-varying gravity coefficients from the GRACE project are converted into equivalent water level over the ocean using various smoothing radii ranging from 300 km to 1500 km. The resulting maps are assessed both qualitatively by examining Empirical Orthogonal Functions (EOFs), and quantitatively by comparing the maps to an expected signal derived from steric-corrected altimetry. Although larger smoothing radii reduce the error in the GRACE maps, they also smooth out the signal more. We find that the largest signal-to-noise ratio occurs with a smoothing radius of 1000 km. At this level of smoothing, the GRACE maps have an error of 2 cm RMS or less.
DE: 1217 Time variable gravity (7223, 7230)
DE: 1222 Ocean monitoring with geodetic techniques (1225, 1641, 3010, 4532, 4556, 4560, 6959)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 4556 Sea level: variations and mean (1222, 1225, 1641)
SC: Geodesy [G]
MN: Fall Meeting 2005