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A Simple Parameterization Scheme of Evapotranspiration over Land for the NMC Medium-Range Forecast Model

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  • 1 National Meteorological Center, Washington, D.C.
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Abstract

The use of a simple bucket method to parameterize the evapotranspiration over land has been found to overestimate the latent heat flux in the global spectral model at the National Meteorological Center. A new parameterization package based on the Penman-Monteith potential evapotranspiration concept is reported here. This package has been implemented to reduce the over-moistening problem. Results indicate improvements in the near surface moisture field over land.

Abstract

The use of a simple bucket method to parameterize the evapotranspiration over land has been found to overestimate the latent heat flux in the global spectral model at the National Meteorological Center. A new parameterization package based on the Penman-Monteith potential evapotranspiration concept is reported here. This package has been implemented to reduce the over-moistening problem. Results indicate improvements in the near surface moisture field over land.

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