HR: 0800h
AN: H21D-1368    [Abstracts]
TI: Terrestrial Water Storage Changes from GRACE
AU: * Seo, K
EM: kiweon@geo.utexas.edu
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, 91108
AU: Wilson, C R
EM: crwilson@maestro.geo.utexas.edu
AF: Department of Geological Sciences, University of Texas at Austin, Austin, 78705
AU: Wilson, C R
EM: crwilson@maestro.geo.utexas.edu
AF: Center for Space Research, University of Texas at Austin, Austin, 78759
AU: Famiglietti, J
EM: jfamigli@uci.edu
AF: Department of Earth System Science, University of California at Irvine, Irvine, 92697
AU: Chen, J
EM: chen@csr.utexas.edu
AF: Center for Space Research, University of Texas at Austin, Austin, 78759
AU: Rodell, M
EM: matthew.rodell@nasa.gov
AF: Goddard Space Flight Center, Hydrological Science Branch, Greenbelt, 20771
AB: Thirteen monthly GRACE gravity solutions from August 2002 to December 2004 are examined to recover terrestrial water storage changes, and to investigate likely errors in the estimates. To understand limitations in GRACE results, simulated monthly GRACE solutions are generated using numerical climate models, GRACE error levels, and the GRACE Atmospheric and Ocean Dealiasing (AOD) model. The simulated data are compared with real GRACE data and used to estimate possible errors from measurement noise, leakage associated with a finite range of spherical harmonics, and AOD model error. Two different filters are used to estimate basin-scale storage changes from spherical harmonics, and each is applied to both real and synthetic GRACE data. Twelve river basins are selected for detailed estimates of water storage changes. Over those basins, real and synthetic GRACE data predict similar amplitudes of water storage fluctuations. In addition GRACE errors are estimated over 53 river basins, representing nearly all Earth­_s surface except Antarctica and Greenland. Water storage errors are generally dependent upon basin size, location, and shape
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1876 Water budgets
SC: Hydrology [H]
MN: Fall Meeting 2005