【摘要】 <正> 一、序言ENSO现象对全球大气环流及其伴随天气的影响,一直是近年来海气相互作用研究的焦点之一,一些有趣的研究表明,ENSO现象对中纬度气候有显著的影响.本文统计了1899-1962年每年发生在20°-40°N,120°-150°E区域(图1)以及主要气旋活动中心(图1阴影更多还原

【Abstract】 Wintertime cyclogenesis over the East China Sea and the surrounding area exerts a profound influence on the climate in this region. In a climatological study of the frequency and position of this cyclogenesis, we have found a significant link to variations of the Southern Oscillation Index (SOI) and E1 Nino events. This appears to be a manifestation of the West Pacific teleconnection pattern discussed by Horel and Wallace on the synoptic scale in which low (high) values of the SOI, associated with high (low) equatorial sea-surface temperature, are also associated with greater than (less than) the average frequency of cyclone formation over the region. We infer the physical basis for this is the preferential formation of an anomalous 500mb low(i.e., strengthening and broadening of the East Asian Trough) during the Southern Oscillation/E1 Nino (ENSO) events via the West Pacific teleconnection.更多还原