Representing model uncertainty using the multiparametrization method

Model error is now recognize as an important source of uncert ainty in Numerical Weather Prediction. Several approaches have been proposed to represent model uncertain ty in Ensemble Prediction Systems. The multiparametrization technique is based on the use of several phy sical parametrization schemes in the same forecast model to account for model errors. After a short description of the multiparametrization approach basis, its implementation and effects on the Météo-France Ensemble Pr ediction System are addressed.

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