THE DEVELOPMENT AND DECAY OF THE 100-MB. SUMMERTIME ANTICYCLONE OVER SOUTHERN ASIA

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Abstract
The south Asian summer anticyclone is discussed with the aid of constant pressure charts, cross-sections, and graphs. The maximum anticyclonic circulation and the core of the subtropical easterly jet occurs close to the 100-mb. surface. Occasionally, this High migrates from its favored position over the Tibetan Plateau westward to the Caspian Sea. A Fourier analysis of the 100-mb. heights at 30° N. indicates that the longitudinal positioning of wave number one is a manifestation of the Asian anticyclone. An attempt to relate the appearance and variations in the surface southwest monsoon with the development of the high-level summertime circulation suggests that a direct vertical relationship is not straightforward and further study is needed to determine the exact nature of the linkage. Abstract The south Asian summer anticyclone is discussed with the aid of constant pressure charts, cross-sections, and graphs. The maximum anticyclonic circulation and the core of the subtropical easterly jet occurs close to the 100-mb. surface. Occasionally, this High migrates from its favored position over the Tibetan Plateau westward to the Caspian Sea. A Fourier analysis of the 100-mb. heights at 30° N. indicates that the longitudinal positioning of wave number one is a manifestation of the Asian anticyclone. An attempt to relate the appearance and variations in the surface southwest monsoon with the development of the high-level summertime circulation suggests that a direct vertical relationship is not straightforward and further study is needed to determine the exact nature of the linkage.

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