Mountain-Induced Convection under Fair Weather Conditions

David Raymond Department of Physics and Geophysical Research Center, R & D Division, New Mexico Institute of Mining and Technology, Socorro 87801

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Marvin Wilkening Department of Physics and Geophysical Research Center, R & D Division, New Mexico Institute of Mining and Technology, Socorro 87801

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Abstract

Measurements of the structure of dry convection over an isolated mountain range heated by the sun are presented. Filter techniques are used to deduce those scales of motion of significance to the circulation. A two-scale process is observed in which a toroidal, heat island circulation ∼20 km in diameter is driven by 3–4 km convective eddies. Large negative heat fluxes are found in the upper part of the convective core over the mountains.

Abstract

Measurements of the structure of dry convection over an isolated mountain range heated by the sun are presented. Filter techniques are used to deduce those scales of motion of significance to the circulation. A two-scale process is observed in which a toroidal, heat island circulation ∼20 km in diameter is driven by 3–4 km convective eddies. Large negative heat fluxes are found in the upper part of the convective core over the mountains.

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