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Title of Journal: Clim Dyn

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Abbravation: Climate Dynamics

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Springer-Verlag

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DOI

10.1016/0002-9394(81)90675-9

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1432-0894

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Uncertainties in the GSWP2 precipitation forcing

Authors: B Decharme H Douville
Publish Date: 2006/06/21
Volume: 27, Issue: 7-8, Pages: 695-713
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Abstract

The Global Soil Wetness Project GSWP is an international initiative aimed at producing global data sets of soil wetness and energy and water fluxes by driving land surface models with stateoftheart 1° by 1° atmospheric forcing and land surface parameters It also provides a unique opportunity to develop and test land surface parameterizations at the global scale using multiyear offline simulations that are not affected by the systematic errors found in atmospheric models Nevertheless the accuracy and reliability of the 10−year GSWP2 atmospheric forcing remain questionable A first comparison using the highresolution RhôneAGGregation RhôneAGG database reveals that the baseline GSWP2 precipitation forcing is drastically overestimated over the Rhône river basin Hydrological simulations driven with each dataset and using the ISBA land surface model and the MODCOU river routing model are also compared The simulated river discharges are validated against a dense network of river gauges and are generally less realistic when using the GSWP2 instead of the RhôneAGG precipitation forcing Secondly the GSWP2 precipitation forcing is compared with three alternative data sets GPCP2 CRU2 CMAP at the global scale Moreover the results of a global sensitivity study to the precipitation forcing conducted with six land surface models are shown The TRIP river routing model is used to convert daily runoff from all models into river discharges which are compared at 80 gauging stations distributed over the globe In agreement with the regional evaluation the results reveal that the baseline GSWP2 precipitation forcing is generally overestimated over the mid and high latitudes which implies systematic errors in the simulated discharges This study reveals that the empirical wind corrections applied to the GSWP2 precipitation forcing are exaggerated whereas the GPCP satellite adjustments seem to be useful for simulating realistic annual mean river discharges over the East Siberian river basinsThe authors would like to thank all their colleagues at the many French laboratories that have participated in the development of the Rhône modeling system as well as Paul Dirmeyer and his team at the Center for Ocean Land Atmosphere studies COLA that have participated in the development of the Global Soil Wetness Project Finally we also wish to thank A Boone and F Habets for their useful comments on the RhôneAGG project Thanks are also due to the anonymous reviewers for their very constructive comments This work was supported by MétéoFrance/CNRM and by the ACI “Observation de la Terre” of the French Research Ministry

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