A Simple Parameterization of Cloud Water Related Variables for Use in Boundary Layer Models

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  • 1 Laboratoire d' Aérologie, Université, Paul Sabatier, Toulouse, France
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Abstract

A simple parameterization of cloud water related variables has been developed which can be used in meteorological models that use a prognostic equation for the turbulent kinetic energy. Based on the results of large-eddy simulations (LES), expressions are derived for the liquid water flux, the partial cloudiness, and the cloud water content as a function of the normalized saturation deficit. With these relations, which are based on LESs ranging from situations with small to moderate amount of cumulus clouds to a stratocumulus case, no further knowledge about distribution functions or skewness is needed.

Abstract

A simple parameterization of cloud water related variables has been developed which can be used in meteorological models that use a prognostic equation for the turbulent kinetic energy. Based on the results of large-eddy simulations (LES), expressions are derived for the liquid water flux, the partial cloudiness, and the cloud water content as a function of the normalized saturation deficit. With these relations, which are based on LESs ranging from situations with small to moderate amount of cumulus clouds to a stratocumulus case, no further knowledge about distribution functions or skewness is needed.

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