2002年北半球大气环流特征及其对中国气候异常的影响  

General Circulation over the Northern Hemispherein 2002 and Its Impact on the Climate in China

作　　者：艾秀 

机构地区：[1]国家气象中心,北京100081

出　　处：《气象》2003年第4期24-28,共5页Meteorological Monthly

摘　　要：20 0 2年春末夏初一次新的厄尔尼诺事件形成 ;1～ 12月北半球大气环流的主要特征表现为 :中纬度地区纬向环流盛行 ,西太平洋副热带高压持续偏强偏西 ,我国大部地区气温偏高 ,降水呈南多北少分布 ;欧亚地区夏季 5 0 0hPa位势高度距平场上 ,中高纬从西到东呈现为“ +-+”分布形式 ,贝加尔湖地区为正距平中心 ,7月在贝加尔湖地区出现典型阻高 ;东亚夏季风偏强 ,南亚夏季风及热带对流指数偏弱 ;夏季赤道辐合带偏弱等。在上述大气环流的影响下 。General circulation features over the Northern Hemisphere in 2002 are analyzed. It′s shown that a new El Nino event happened in late spring early summer. The subtropical high at 500hPa over the western Pacific was stronger than normal in 2002. In the summer, the 500hPa geopotential height anomaly was positive in Eurasia, and the positive center was over Lake Baikal, and the blocking high appeared over Lake Baikal in July. The East Asian summer monsoon was stronger than normal, and the South Asian summer monsoon and tropical convection index in summer were weaker than normal. All the features would exert a significant impact on the weather and climate in China in 2002, especially in summer.

关 键 词：2002年 北半球 大气环流 厄尔尼诺事件 中纬度地区 中国 气候变化 降水 

分 类 号：P461[天文地球—大气科学及气象学] P467