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The Indian Summer Monsoon

Jen-Hu Chang
Geographical Review
Vol. 57, No. 3 (Jul., 1967), pp. 373-396
DOI: 10.2307/212640
Stable URL: http://www.jstor.org/stable/212640
Page Count: 24
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The Indian Summer Monsoon
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Abstract

The burst of the monsoon in India is accompanied by an abrupt and complicated change in the upper-air circulation. The monsoon cell is characterized by easterly jets aloft and south-westerlies near the surface; it is separated from the circulation in middle latitudes by the monsoon trough at the surface and by the Tibetan anticyclone above the mid-troposphere. The easterly jets fluctuate in accordance with the release of latent heat in regions of heavy rainfall. The release of latent heat also plays a significant role in accentuating the low pressure over the Thar Desert. The structure of the monsoon depressions differs markedly from that of the Caribbean type of easterly waves. During periods of breaks in the monsoon, the Tibetan anticyclone disappears, the monsoon trough moves northward, and heavy rainfall is concentrated along and near the foot of Himalayas.

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