Graduate Thesis Or Dissertation
 

Parameterization of shallow convection in the boundary layer

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  • A shallow convection scheme is derived from several data sets (BOMEX, GATE, AMTEX, BLX83) and developed for the OSU 1-D boundary layer model. Results of the model structure and characteristics of the saturation point (SP) profile are compared against the constant cloud diffusivity scheme of Tiedtke (1983) and the ECMWF boundary layer parameterization scheme. The results indicate that the primary mechanism that transports moisture away from the lower boundary layer is the boundary layer turbulent flux and that the boundary turbulent mixing alone is capable of maintaining an apparent moisture source near the inversion. While the sensible heat flux over ocean becomes quite small after a few hours of model simulation, the virtual heat flux remains positive and the boundary layer remains in the unstable regime.
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