CHANGING PRESSURE SYSTEMS AND THE ASCENT OF AIR

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  • 1 University of Cape Town
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Abstract

An equation is derived expressing the vertical velocity of air in terms of the pressure gradient, the development and rate of movement of the pressure system, and the wind velocity.

In the derivation of the equation neither friction nor horizontal acceleration is excluded, but the vertical component of acceleration is assumed to be small. The effect of each of the terms of this equation is estimated numerically for typical values of the quantities involved. Two of the terms are then transformed so that their contribution to ascent can be calculated from the rate of turning of the wind with height. Conditions under which certain of the terms become dominant are briefly discussed.

Abstract

An equation is derived expressing the vertical velocity of air in terms of the pressure gradient, the development and rate of movement of the pressure system, and the wind velocity.

In the derivation of the equation neither friction nor horizontal acceleration is excluded, but the vertical component of acceleration is assumed to be small. The effect of each of the terms of this equation is estimated numerically for typical values of the quantities involved. Two of the terms are then transformed so that their contribution to ascent can be calculated from the rate of turning of the wind with height. Conditions under which certain of the terms become dominant are briefly discussed.

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