Cloud droplet number will be represented as a prognostic variable that is dependent on aerosol concentrations and vertical motion. Cloud variables will be parameterized for use in GCMs. Verification will be achieved through comparison with observed radiative fluxes, cloud distribution, and vertically integrated cloud liquid water. The moments of the pdfs are related to the first and second moments of the mass concentrations. The second moment of the rain concentration is diagnosed by integrating the autoconversion and collection of cloud water over the joint pdfs of cloud water and rain.
Preliminary simulations are qualitatively realistic.
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