Abstract
Abstract Extensive numerical simulations are performed to demonstrate that the landscape-induced mesoscale sensible heat, moisture, and momentum fluxes associated with spatially heterogeneous convective boundary layers can be larger than, and have a different vertical structure from, the turbulent fluxes for a typical general circulation model grid box. The mesoscale fluxes above the convective boundary layer may also provide a natural mechanism for the strong coupling between the boundary layer and the free atmosphere above. The parameterizability of these memoscale and turbulent fluxes is demonstrated based on their predictability. Nine dimensionless parameters are proposed, which combine large-scale quantities with local inhomogeneities and consider both horizontal and vertical variations. Based on these parameters, parameterization schemes for the mesoscale and turbulent sensible heat, moisture, and momentum fluxes in the convective boundary layer, and for the total (i.e., mesoscale plus turbulent) se...
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