亚非季风区夏季降水与热带东风急流的关系

Relationship between the Precipitation in the Monsoon Prevail Regions of Asia and Africa Continent in Summer and TEJ

利用1948～2007年资料,对夏季热带东风急流(TEJ)的结构、亚非季风区夏季降水分布以及TEJ变化与亚非季风区夏季降水的关系进行了研究。结果表明,热带东风急流主要覆盖了热带地区从日界线向西延伸到非洲西海岸的大片地区,其核心位于150～100hPa印度半岛南部10°～15°N,中心风速超过35 m/s;急流中线大致位于70°E,以东是急流的入口区,以西是出口区;在急流的入口区和出口区存在2个近于相反的垂直环流。多年亚非季风区夏季降水分布与热带东风急流的位置和强度有密切关系,在急流不同部位降水特征不同,多雨区主要出现在急流入口区右侧和出口区左侧。热带东风急流与降水分布的关系可以用急流不同部位的垂直速度不同来解释。

By using data during 1948-2007,the structure of TEJ,summer precipitation distribution in monsoon prevail regions of Asia and Africa continent and their relationship were studied.TEJ mainly covered large region from dateline west-toward to west-coastal of Africa continent,the core was located 150-100 hPa southern of India Peninsula 10°-15°N,the wind speed over 35 m/s;the midline was in 70°E;there were two inverse vertical circulation in entrance and exit of rushing.Summer precipitation in the monsoon prevail regions of Asia and Africa continent had losed relationship with location and intensity of TEJ,the characters was various in different parts of rushing.The relationship between TEJ and precipitation distribution could be explained by vertical speed at different parts of rushing.