Parameterization of the Dynamics of Stable Boundary Layers and Nocturnal Jets

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  • 1 Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Boulder 80309
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Abstract

In this paper a slab model for horizontally homogeneous, stable boundary layers is developed, where variations in mean quantities at the boundary-layer top and in mean shear are accounted for. A rate equation for the boundary-layer depth is derived from the integral conservation equation for mean kinetic energy. The stab model compares favorably with a second-order closure model in simulating evolution of a nocturnal boundary layer. The model is applied to the prediction of nocturnal jets over the Great Plains; it is shown that the jet intensity depends primarily on the surface cooling rate at sunset and on baroclinity.

Abstract

In this paper a slab model for horizontally homogeneous, stable boundary layers is developed, where variations in mean quantities at the boundary-layer top and in mean shear are accounted for. A rate equation for the boundary-layer depth is derived from the integral conservation equation for mean kinetic energy. The stab model compares favorably with a second-order closure model in simulating evolution of a nocturnal boundary layer. The model is applied to the prediction of nocturnal jets over the Great Plains; it is shown that the jet intensity depends primarily on the surface cooling rate at sunset and on baroclinity.

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