Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 14 1 2010 10.5194/hess-14-59-2010 http://www.hydrol-earth-syst-sci.net/14/59/2010/ http://www.hydrol-earth-syst-sci.net/14/59/2010/hess-14-59-2010.html http://www.hydrol-earth-syst-sci.net/14/59/2010/hess-14-59-2010.pdf 59 78 2010-01-11 Calibration analysis for water storage variability of the global hydrological model WGHM S. Werth A. Güntner Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany The aim of this study is to provide an improved global simulation of continental water storage variations by calibrating the WaterGAP Global Hydrology Model (WGHM) for 28 of the largest river basins worldwide. Five years (January 2003–December 2007) of satellite-based estimates of the total water storage changes from the GRACE mission were combined with river discharge data in a multi-objective calibration framework that uses the most sensitive WGHM model parameters. The uncertainty and significance of the calibration results were analysed with respect to errors in the observation data. An independent simulation period (January 2008–December 2008) was used for validation. The contribution of single storage compartments to the total water budget before and after calibration was analysed in detail. A multi-objective improvement of the model states was obtained for most of the river basins, with mean error reductions of up to 110 km³/month for discharge and up to 24 mm of a water mass equivalent column for total water storage changes, such as for the Amazon basin. Errors in the phase and signal variability of seasonal water mass changes were reduced. The calibration is shown to primarily affect soil water storage in most river basins. The variability of groundwater storage variations was reduced on a global scale after calibration. 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