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《Acta Meteorologica Sinica》 1979-04
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A PRELIMINARY STUDY ON THE LOW-LEVEL CROSS-EQUATORIAL AIR FLOW AND THE SUMMER MONSOON FROM SOUTH CHINA SEA TO THE WEST PACIFIC

Wang Zuo-shu He Shi-xiu (Institute of Atmospheric Physics,Academia Sinica)  
Based on data of July and August for years 1974-1977,the general circulationin the equatorial regions from south China Sea to the West Pacific is studied.It is found that,so far as the climatological average is concerned,the EastAfrican low-level jet can influence the south parts of India,Bay of Bengal,Indo-China,and South China Sea.In this regions,the interannual changes of monthlymean intensity of southwest monsoon are consistent with each other.There is achannel of cross-equatorial flow Iocated at about 150°E near the east coast of NewGuinea,while in the area of 110-140°E equator there is no strong and consistentsoutherly cross-equatorial flow.To the east of New Guinea,the air from SouthernHemisphere crosses the equator and turns to southwesterly flow blowing in the Ne-rthwestern Pacific.The topographical influence of the high mountains in NewGuinea is the important cause of the existence of this cross-equatorial flow.It isfound that the southwest monsoon in the southern parts of Indo-China and SouthChina Sea mainly comes from southern India and Bay of Bengal,it does not dire-ctly comes from the Southern Hemisphere.But the southwest monsoon in tropicalNerthwestern Pacific comes directly from Southern Hemisphere.The intensity ofthe southerly component of cross-equatorial flow near the east coast of New Gui-nea closely relates to the intensity of the southwest monsoon in the tropicalNerthwestern Pacific.Hence,the southwest monsoon to the south about 15°Nfrom Southern Asia to Nerthwestern Pacific consists of two branches of air flow,one is the East African low-level jet,which flows from southern India to SouthChina Sea,and the other comes from the Southern Hemisphere crossing equatornear 150°E.
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