HR: 1340h
AN: G33B-0033    [Abstracts]
TI: Global hydrology by GRACE geoid inversion: liquid water storage, snow mass and evapotranspiration changes over large drainage basins
AU: * Ramillien, G
EM: ramillien@notos.cst.cnes.fr
AF: LEGOS-CNES, 18 avenue Edouard Belin, Toulouse, cedex 9, 31401 France
AU: Frappart, F
EM: frappart@notos.cst.cnes.fr
AF: LEGOS-CNES, 18 avenue Edouard Belin, Toulouse, cedex 9, 31401 France
AU: Cazenave, A
EM: anny.cazenave@cnes.fr
AF: LEGOS-CNES, 18 avenue Edouard Belin, Toulouse, cedex 9, 31401 France
AB: Multi year time series of monthly GRACE solutions are inverted, using an iterative approach, to estimate changes in total soil water storage as well as snow mass change, globally. Land water solutions are used to compute time-series of water mass and snow mass in selected river basins and in high-latitude boreal regions. Comparisons with four different global land surface models are performed at global and basin scales. By resolution of the water mass balance equation, global maps of the evapotranspiration rate and associated uncertainties are also derived by combining the land water solutions from GRACE with precipitation observations and runoff data from models. Estimated basin scale evapotranspiration rates are compared to outputs of the four global land surface models. Seasonal cycle and Orthogonal Empirical Function (EOF) analyses of the GRACE derived evapotranspiration maps were performed to characterize the global evolution of this hydrological parameter.
DE: 1214 Geopotential theory and determination (0903)
DE: 1243 Space geodetic surveys
DE: 1640 Remote sensing (1855)
SC: Geodesy [G]
MN: Fall Meeting 2005