东北冷涡的时空分布特征及其与东亚大型环流系统之间的关系

THE CLIMATOLOGICAL CHARACTERISTICS OF NORTHEAST COLD VORTEX IN CHINA

文章用３５年（１９５６－１９９０）资料，对东北冷涡的时空分布特征，及其与东亚大型环流系统之间的关系做了研究，发现东北冷涡的出现不仅在时间上有相对的集中期，在地理分布上有着明显的密集性，并且东亚地区阻塞高压的异常发展及位置变化、西太平洋副高的强度及位置变化等对东北冷涡的形成和发展均具有至关重要的影响。

A climatological andlysis of spatial and temporal distfribution of the nortHeast coldvortex in China during the period 1956-1990 and their relationship with the generalcirculation over East Asia is presented based on Beijing Meteorological Center’shistorical weather map. The results show: The frequency of northeast cold vortex hassignificant continuity , interannual variability, inter-monthly change and the low-frequency variation. And they trend to appear in the regions of low-lying landgenerally, such as Northeast Plain and Three-River Plain,especially the developingnortheast cold vortex also relates to the contrast of ocean-land distribution. Thevariations of the frequency and location of the northeast cold vortex are characterized byateleconnection structure at 500 hPa in East Asia. The effective factors are mainlyconcerned with the location and intensity of the blocking over East Asia and subtropicalhigh.