2000年北半球大气环流特征及其对中国气候的影响

2000年受La Nina结束后冷水事件的影响，北半球大气环充的要主特征表现为：500hPa东亚中纬度呈经，纬向环流交替分布，西太平洋副热带高压偏弱，偏北，偏东，热带对流活动冬季偏强，夏季偏弱，赤道辐合带偏弱，在上述大气环流的影响下，台风偏少，夏季主要多雨带位于黄河与长江之间，黄河以北地区干旱严重。

The Characterstics of the Northern Hemispheric General Circulation and Its Influences upon China Climate in 2000

Because of the cold episold of SST in the east equatorial Pacific, the characteristics of the general circulation in the northern Hemisphere are as follows: the general circulations in the middle and high latitude of the northern Hemisphere are vicissitude of zonal and meridional cell; the west Pacific subtropical high is weaker, northward and eastward; the tropical convections are strong in winter and spring, and weak in summer; both the summer monsoon and the ITCZ are weak Under the influence of the climatic conditions, the typhoon is less than normal; the major rainband is located between the Yellow River and Yangtze River;drought in the north of Yellow River is severe