Abstract
Abstract The present study introduces a parameterization for the mixing in the surface-generated free convection regime (including dry and moist convection cases). The parameterization explicitly represents the plumes that drive the convective turbulence. Ascending parcels that have similar properties in the surface layer are grouped into updrafts, with a determined fractional area. The updrafts ascend according to an entraining plume model, and may eventually overturn. The plume model can either use a time or a length scale for the lateral entrainment closure. The plumes' environment is assumed to be horizontally uniform. A one-dimensional framework is used to evaluate the parameterization in the case of a dry convective boundary layer (CBL). The predicted variances are underestimated (presumably due to the uniform environment assumption). The contrast between the strong upward motions and the compensating subsidence is simulated, and the skewness of w increases realistically with height. The plumes' dyn...
Published Version
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