The Center for Southeast Asian Studies, Kyoto University
抄録(英)
During the northerm summer monsoon period, the cloudiness fluctuation over and around India shows a predominant periodicity of 30 to 40 days as a major active-break cycle of monsoon activity, and this fluctuation appears as a northward phase shift of maximum (or minimum) cloudiness from the equatorial Indian Ocean toward the Himalayas (T. YASUNARI : J. Meteorol. Soc. Jpn, 57,227,1979; ibid., 58,225,1980). It has also been revealed that the northward movement of the cloudiness with this periodicity is triggered by the cold air outbreak toward the equator, associated with the large-scale westerly wave motions such as an index cycle in the Southern Hemisphere mid-latitudes (T. YASUNARI : J. Meteorol. Soc. Jpn, 59,336,1981). In addition, the analysis of the temperature fluctuation at 500mb over Syowa Station, East Antarctica, showed the dominant periodicity of the same period range (30-40 days) especially in the winter season. These results lead to a tentative idea that the major active-break cycle of Asian summer monsoon is closely linked with the hemispheric-scale wave motions in the Southern Hemisphere including the circumpolar vortex over Antarctica.
雑誌書誌ID
AA00733561
雑誌名
Memoirs of National Institute of Polar Research. Special issue
Influence of the Southern Hemisphere Circulations on the Active-Break Cycle of the Indian Summer Monsoon
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KJ00000011710
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概要
