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

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.