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Monthly Land Water Solutions by Least-Square Inversion of GRACE Geoid Data (2002-2006)
Ramillien, G1; Grousset, I2; Llovel, W3; Cazenave, A2; Flechtner, F4; Schmidt, R4
1CNRS; 2CNES; 3LEGOS; 4GFZ

A least-square inversion procedure is used to derive the Land Water (LW) variations at the resolution of about 400 km by combining: (1) the monthly GRACE solutions recently made available by GFZ, and (2) a priori information from global hydrology models, from August 2002 to February 2007. This approach proves to be an efficient strategy to separate different hydrological components (i.e., water storage and snow) from other geophysical phenomena, residuals errors and high-frequency noise. Time-series of continental water storage for large drainage basins can be derived from these monthly LW solutions, and proved to be consistent in comparison with sparse in situ measurements of water levels and hydrological model outputs. A posteriori uncertainties on the estimated LW coefficients and errors from truncation of spectrum and leakage are also computed.

 

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