Consistent estimation of water mass variations in different continental storage compartments by the com-bined inversion of a global hydrological model with time-variable gravity and complementary observation data

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This project aims at the consistent assimilation of satellite-based and in-situ observations into the global hydrological model WGHM. The main goals of this proposal are (1) the spatio-temporal partitioning of continental water mass variations among different storage compartments, (2) the set-up of an appropriate mathematical formulation (including stochastics) for the joint estimation of improved model parameters from multi-sensor and (3) the production of improved time series of continental water mass variations from simulation with WGHM after integration of the observation data using enhanced process formulations and parameters for selected regions (case studies). The assimilation will be based on total water storage variations from GRACE and the atmospheric-terrestrial water balance as well as an temporal variations of water mass in the compartments surface water, soil moisture and snow that are contributed by an external project. The proposed project corresponds to the goals of the SPP theme Understanding the satellite signals and Short-term processes.