1998年大气环流异常及其对中国气候异常的影响  

General Atmospheric Circulation Anomaly in 1998 and Their Impact on Climate Anomaly in China

作　　者：李维京[1] 

机构地区：[1]国家气候中心

出　　处：《气象》1999年第4期20-25,57,共7页Meteorological Monthly

摘　　要：１９９８年受ＥＮＳＯ事件和青藏高原冬春季积雪多等因素的影响，北半球大气环流的主要特征是：５００ｈＰａ西太平洋副高强大，夏季副高脊线位置偏南；冬、夏季风均较弱；赤道辐合带异常偏弱，在西太平洋生成和登陆影响我国的台风和热带风暴异常偏少；夏季亚洲中高纬度经向环流发展，其它季节则以纬向环流为主；Because of influence of the ENSO and more snow cover over Tibetan Plateau in winter and spring on general circulation over the Northern Hemisphere in 1998,the dominant anomaly has been charaterized by the subtropical high over the west Pacific and it is very stronger,and at the same time moves southward in summer.Monsoon over China Sea is weaker and begins later one week than normal.ITCZ over the west Pacific is also weaker than normal so that outgrowth and landing typhoon and tropical storms are so less than normal.At 500hPa,zonal circulation is dominant in the middle latitude of Asia in spring,autumn and winter,but the meridinal circulation is strengthened in summer.These may be the main reasons that influence climate anomaly in China in 1998.

关 键 词：厄尔尼诺 环流异常 气候异常 大气环流 中国 

分 类 号：P434[天文地球—大气科学及气象学] P461