Further Studies on a Transient Cumulus Cloud Ensemble and Its Large–Scale Interaction

Klaus Fraedrich Institut für Meteorologie, Freie Universität Berlin, 1 Berlin 33, Germany

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Abstract

A parametric model of a transient cumulus cloud with the related cloud population is introduced. A closure condition is presented which couples the statistical, physical and geometrical parameters of the cloud ensemble with the large-scale circulation. The large-scale sources of latent and sensible heat, as well as the vorticity due to the convective activity of the transient cloud ensemble, can be deduced either with the aid of direct cloud observations or by using the closure condition. The latter approach is applied to undisturbed ATEX 1969 data.

Abstract

A parametric model of a transient cumulus cloud with the related cloud population is introduced. A closure condition is presented which couples the statistical, physical and geometrical parameters of the cloud ensemble with the large-scale circulation. The large-scale sources of latent and sensible heat, as well as the vorticity due to the convective activity of the transient cloud ensemble, can be deduced either with the aid of direct cloud observations or by using the closure condition. The latter approach is applied to undisturbed ATEX 1969 data.

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