Les biais systématiques des indicateurs globaux de précipitations en zones arides et montagneuses: un essai d'analyse régionale.

Jean-Claude Bergès (1) , Gérard Beltrando (1)

1 PRODIG - Pôle de recherche pour l'organisation et la diffusion de l'information géographique

Satellite observation system of rain events is quickly expanding with the new microwave sensors. And several global rainfall products are broadcasted on the Web. This paper focuses on two products: the GSMAP- MVK+ and the GPCP-1DD. It performs a bias regional analysis and relates the estimation errors to the algorithm design. The main results is, whereas the most advanced microwave estimator performs better for local scale rainfall retrieval, the orographic phenomena are deeply underestimated. This conclusion raises the issue of adapting the downscaling method in front of significant orographic effects.

Domaines: Sciences de l'environnement

Jean-Claude Bergès, Gérard Beltrando. Les biais systématiques des indicateurs globaux de précipitations en zones arides et montagneuses: un essai d'analyse régionale.. XXVème Colloque de l’Association Internationale de Climatologie, Sep 2012, Grenoble, France. p.125-130. ⟨hal-01021007⟩