Diagnosis and extratropical precipitation in the MM5 model

Authors: Ivanov, S.V., and J.O. Palamarchuk

Year: 2008

Issue: 05

Pages: 100-111


Quantitative precipitation forecasts are diagnosed and systematic model errors of precipitation over the North Atlantic and European continent are eval ated in he MM5v3.7 model.  Quantitative estim tes are based on a u t a comparison of model fields against ERA40 reanalysis data. It is shown that the model redistributes water vapor from the middle and upper atmosphere toward the boundary layer. The maximum of the systematic humidity error in the vertical direction is located at the 850 hPa. The model overestimates precipitation, particularly convective form, over the warm ocean surface. Also, the model redistributes water from large scale to convective precipitation within a stationary or slow depression in the high latitudes over the ocean. The phase error is a typical phenomenon in the regions of the heavy and moderate precipitation rates. The set of parameterization schemes earlier defined as an optimal for major forecast variables in extratropics during the winter season has found a conformation for precipitation forecasts as well.

Tags: convective and large scale precipitations; the set of parameterization schemes; the systematic model error


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