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KMID : 1024519960050050619
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Journal of the Environmental Sciences
1996 Volume.5 No. 5 p.619 ~ p.633
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The 40~50Day Intraseasonal Oscillation of the Geostationary Meteorological Satellite High Cloud Amount
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Ha Kyung-Ja
Suh Ae-Sook
Sugimori Yasuhiro
Moon Ja-Yeon
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Abstract
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Intraseasonal variability of the tropical convection over the Indian/western Pacific is studied using the Geostationary Meteorological Satellite high cloud amount. This study is directed to find the tropical-extratropical interaction in the frequency range of intraseasonal and interannual variabilities of the summer monsoon occured over the domain of 90E-171W and 495-50N. Especially, in order to investigate the intraseasonal interaction of last Asia summer monsoon associated with the tropical convections in the high cloud amounts, the spatial and time structure of the intraseasonal oscillation for the movement-and the evolution of the large-scale connections are studied. To describe the spatial and the time evolution, the extended empirical orthogonal function analysis is applied. The first mode may be considered to a normal structure, indicating that the strong convection band over 90E-120E is extended to sastward but this mode was detected as the intraseasonal variability during summer monsoon. It is found that the dominant intraseasonal mode of the tropical convection consists of the spatial changes over a broad period range centered around 40~50days.
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