Formulation of a bulk boundary layer model with partial mixing and cloudiness
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The classical cloud-topped mixed-layer model is generalized to allow for arbitrary fractional cloudiness and incomplete mixing. The boundary-layer depth and turbulence kinetic energy (TKE) are prognostically determined. The large turbulent eddies that contain most of the TKE and are primarily responsible for the fluxes are modeled as convective circulations, with ascending and descending branches. By assuming that the ventilation and entrainment layers at the lower and upper edges of the PBL are dominated by small-scale turbulence in quasicquilibrium, boundary conditions are developed for the ...