THE WORK DONE ON THE SURROUNDING ATMOSPHERE BY SUBSIDING COLD AIR MASSES

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  • 1 University of Chicago
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Abstract

The flux of energy due to the pressure force acting across the boundary of a subsiding mass of cold air is investigated. It is shown that for mean values of the subsiding motion of the order of −1 cm sec−1 or larger, energy is transferred from the cold air to the surrounding atmosphere. A method is developed whereby this flux across a portion of a frontal surface can be calculated from a three-dimensional frontal analysis, and this technique is then applied to a specific example. The importance of the addition of this energy to the current flowing around the cold air is discussed, and it is suggested that at least a portion of the energy for the indirect circulations which are often observed downstream is supplied by the direct circulation involving the subsiding cold air mass.

Abstract

The flux of energy due to the pressure force acting across the boundary of a subsiding mass of cold air is investigated. It is shown that for mean values of the subsiding motion of the order of −1 cm sec−1 or larger, energy is transferred from the cold air to the surrounding atmosphere. A method is developed whereby this flux across a portion of a frontal surface can be calculated from a three-dimensional frontal analysis, and this technique is then applied to a specific example. The importance of the addition of this energy to the current flowing around the cold air is discussed, and it is suggested that at least a portion of the energy for the indirect circulations which are often observed downstream is supplied by the direct circulation involving the subsiding cold air mass.

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