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On cumulus-scale transport of horizontal momentum in monsoon depression over India

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Abstract

A diagnostie method of cumulus parameterization is suggested in which vertical transport of horizontal momentum by cumulus-scale is derived by making use of large-scale vorticity as well as divergence budget equations. Data for composite monsoon depression over India available from our earlier studies used to test the method. As a first approximation, the results are obtained using only the vorticity budget equation.

The results show that in the southwest sector of the monsoon depression, which is characterized by maximum cloudiness and precipitation, there is an excess of cyclonic vorticity in the lower troposphere and anticyclonic vorticity in the upper troposphere associated with the large-scale motion. The distribution of eddy vertical transport of horizontal momentum is such that anticyclonic vorticity is generated in the lower troposphere and cyclonic vorticity aloft. Cumulus-scale eddies thus work against the large-scale system and tend to off-set the large-scale imbalance in vorticity.

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  1. Department of Meteorology, Florida State University, 32306, Tallahassee, Florida, USA

    Ramesh V. Godbole

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  1. Ramesh V. Godbole
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Godbole, R.V. On cumulus-scale transport of horizontal momentum in monsoon depression over India. PAGEOPH 115, 1373–1381 (1977). https://doi.org/10.1007/BF00874414

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  • DOI: https://doi.org/10.1007/BF00874414

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