HR: 0800h
AN: G31C-0802    [Abstracts]
TI: Estimating mass balances of the global water reservoirs by GRACE satellite gravimetry
AU: * RAMILLIEN, G
EM: ramillie@notos.cst.cnes.fr
AF: LEGOS CNRS UMR5566 / CNES, Observatoire Midi-Pyrenees 18, Avenue Edouard Belin, Toulouse, 31400 France
AU: LOMBARD, A
EM: lombard@notos.cst.cnes.fr
AF: LEGOS CNRS UMR5566 / CNES, Observatoire Midi-Pyrenees 18, Avenue Edouard Belin, Toulouse, 31400 France
AU: CAZENAVE, A
EM: Anny.Cazenave@cnes.fr
AF: LEGOS CNRS UMR5566 / CNES, Observatoire Midi-Pyrenees 18, Avenue Edouard Belin, Toulouse, 31400 France
AB: According to global hydrology models, the total water storage on the continents continuously decreases with time. In order to verify this scenario of a global and progressive transfer of water mass between the atmosphere, the oceans and the continents, we estimated and analysed the time-variations of the water mass in these water mass reservoirs for a recent period of time by space gravimetry. For this purpose, we used the monthly GRACE geoids recently released by CSR and GFZ (04/2002-05/2004). The spatial resolution of the GRACE solutions was unfortunately limited to degree 10-15 (around 2000 km) by the presence of noise for the higher harmonic degrees. The water mass changes were also analysed using Empirical Othogonal Functions (EOFs) decompositions for characterizing the main modes of mass variability for each water reservoirs at seasonal and inter-annual time scales.
DE: 1899 General or miscellaneous
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 1299 General or miscellaneous
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting