中文摘要：

东北寒冷旋涡(NECV ) 是在在东亚的中间、高的纬度的一个重要天气系统。它的时间规模是摘要的，还 NECVhave 的经常的活动“向东北在更低的对流层影响每月的温度在的重要气候效果”不仅在东亚的中国而且 Meiyu 降雨。根据 ECMWF 提供的 ERA-40reanalysis 数据，“有在东亚的 Meiyu 的 NECV 和它的关系的气候效果”被学习。在 theMeiyu 时期和降雨数量期间在 NECV 之间有重要关联，这被显示出：强壮的 NECV 对应于更多的 Meiyu 降雨和弱 NECVcorresponds 到更少的降雨。在强壮的 NECV 年里，从北方的干燥、冷的空气被导致由 NECV 的南方，收敛与降低水平温暖、湿在北方边缘 ofMeiyu 区域上西南，因此形成“上面的干”和更低的湿的不稳定的层化。Triggeredby 上升运动， Meiyu 降雨数量是非常平常的。它是相反在 weakNECV 年里。在在上一年的北方太平洋的异常 SST 可以是在 Meiyu 时期导致异常 NECV 的一个因素。陆地海在夏天的热对比便于 NECV，当那在冬季禁止 NECV 时。上述所有为 NECV 和 Meiyu 的 short-termclimate 预言提供有意义的结果。

英文摘要：

The Northeast Cold Vortex （NECV） is an important weather system in the middle and high latitudes in East Asia. Its time scale is synoptic, yet the frequent activities of NECV have significant ＂climate effect＂ which Influences not only the monthly temperature in the lower troposphere in Northeast China but also the Melyu rainfall in East Asia. On the basis of ERA-40 reanalysis data provided by ECMWF, the ＂climate effect＂ of NECV and its relationship with Melyu in East Asia are studied. It is shown that there is significant correlation between NECV during the Melyu period and rainfall amount： strong NECV corresponds to more Melyu rainfall and weak NECV corresponds to less rainfall, in strong NECV years, the dry and cold air from the north is led to the south by NECV, converges with the lower-level warm and wet southwesterly on the north verge of Meiyu region, thus forms an unstable stratification of ＂upper dryness and lower wetness＂. Triggered by ascending motion, the Meiyu rainfall amount is more than usual. It is on the contrary in weak NECV years. The anomalous SST in north Pacific in the previous year may be a factor that results in the anomalous NECV at Melyu period. The land-sea thermal contrast in summer facilitates NECV, while that in winter Inhibits NECV. All of the above provide a meaningful result for the short-term climate prediction of NECV and Meiyu.