Parametrization of area cloud fraction

Data-driven stochastic parametrization for subgrid-scale tropical convective area fraction

Cloud parametrization - Progress, Problems and Prospects

Processes that occur in clouds cover a wide range of spatial scales, from micrometers in the condensation and evaporation of individual cloud droplets through a few hundred meters in the case of fair weather cumulus clouds up to several hundred kilometers for the cloud systems associated with extratropical baroclinic systems. In order to describe the main effects clouds have on the atmosphere a...

Physically based two-moment bulkwater parametrization for warm-cloud microphysics

A two-moment bulkwater parametrization scheme for warm-cloud microphysics is developed via statistical analyses of results from a detailed parcel model. This computationally efŽ cient scheme is quite accurate and produces bulkwater properties which resemble the results from a fully explicit microphysical model. It responds sensitively to the effect of aerosol types on the cloud drop number conc...

Constraining the aerosol influence on cloud fraction

Aerosol-cloud interactions have the potential to modify many different cloud properties. There is significant uncertainty in the strength of these aerosol-cloud interactions in analyses of observational data, partly due to the difficulty in separating aerosol effects on clouds from correlations generated by local meteorology. The relationship between aerosol and cloud fraction (CF) is particula...

Geometrically effective cloud fraction for solar radiation

It has been suggested in the past that an AeffectiveB cloud fraction can be used to take into account cloud geometry effects in solar radiation parameterizations. All such models have been based on the reflected flux from non-plane-parallel cloud fields. In this study, it is shown that the Ž . AeffectiveB cloud fraction based on absorption or transmission could differ considerably from that bas...