【摘要】 根据1950—1956年6—8月日本馆野站上空200毫巴的每天测风材料,定出在东亚梅雨结束期的风向、风速转变的奇异性.我们发现馆野上空西风急流的消失和东风的出现,是东亚梅雨结束和盛夏开始时期的一个良好的标记.另外,又作了1954—1956年东经140度各年6—7月每5天平均东西风风速剖面图.我们发现在东亚梅雨结束时期,日本上空的高空西风北撤,太平洋副热带高压脊显著北伸,并且西南太平洋上的颱风便一个接一个侵入东海黄海.这种特徵各年都是相似的,因此可能有一定的预告价值.更多还原

【Abstract】 Based on wind data at 200 mb over Tateno,Japan,for June—august,1950—1956.We discussed the variation of wind field during the last stageof Mai-yü in eastern Asia.It is found that the northward displacement ofwesterly Jet stream and the appearrance of easterly wind is a good indexof the end of Mai-yü period and the beginning of prevailing summer sea-son.Besides,the 5-days mean cross sections of zonal wind along 140°Efor the period of June and July,1954—1956 are constructed.From themwe further found that during the last stage of Mai-yü,with the northwardretreat of the upper westerlies over Japan,the subtropical ridge apparantlyshifts northward and the typhoons which were limited to the south westernpart of the Paciffic now begin to invade East sea and Yellow sea one byone.These facts are probably helpful to predication.更多还原