Cloud-Environment Interface Instability. Part III: Direct Influence of Environmental Shear

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  • 1 National Center for Atmospheric Research, Boulder, Colorado
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Abstract

The direct effect of vertical shear of the horizontal wind for the unperturbed environment on the cloud-environment interface instability is investigated. Results indicate that the direct influence of environmental shear typical of atmospheric magnitudes is negligible. This is explained as a result of the large difference between typical magnitudes of environmental shear (usually smaller than 10−2 s−1) and the magnitude of baroclinically generated interfacial shear (typically around 10−1 s−1 for small cumuli).

Abstract

The direct effect of vertical shear of the horizontal wind for the unperturbed environment on the cloud-environment interface instability is investigated. Results indicate that the direct influence of environmental shear typical of atmospheric magnitudes is negligible. This is explained as a result of the large difference between typical magnitudes of environmental shear (usually smaller than 10−2 s−1) and the magnitude of baroclinically generated interfacial shear (typically around 10−1 s−1 for small cumuli).

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