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Cloud Fraction and Relative Humidity in a Prognostic Cloud Fraction Scheme

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  • 1 European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
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Abstract

The relationship between relative humidity and low cloud cover produced by a prognostic cloud fraction formulation is compared with observations. From a steady-state version of the prognostic cloud fraction equation, a diagnostic relation for cloud fraction can be derived for subtropical boundary layer clouds. The results are quite realistic when compared with observations illustrating the relevance of the coupling with parameterized convection.

UCAR visiting scientist, Naval Research Laboratory, Monterey, California

Corresponding author address: Dr. João Teixeira, Naval Research Laboratory, 7 Grace Hopper Ave., Monterey, CA 93943. Email: teixeira@nrlmry.navy.mil

Abstract

The relationship between relative humidity and low cloud cover produced by a prognostic cloud fraction formulation is compared with observations. From a steady-state version of the prognostic cloud fraction equation, a diagnostic relation for cloud fraction can be derived for subtropical boundary layer clouds. The results are quite realistic when compared with observations illustrating the relevance of the coupling with parameterized convection.

UCAR visiting scientist, Naval Research Laboratory, Monterey, California

Corresponding author address: Dr. João Teixeira, Naval Research Laboratory, 7 Grace Hopper Ave., Monterey, CA 93943. Email: teixeira@nrlmry.navy.mil

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