冬季北极涛动和华北冬季气温变化关系研究
投稿时间: 2001-12-06  最后修改时间: 2002-04-23  点此下载全文
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作者单位
何春 南京气象学院, 大气科学系, 江苏, 南京, 210044 
何金海 南京气象学院, 大气科学系, 江苏, 南京, 210044 
基金项目:国家重点基础研究发展规划(G1998040900)项目第1部分
中文摘要:利用北极涛动指数(AOI)、NCEP/NCAR40a再分析资料中的海平面气压(SLP)、850、500、200hPa等压面高度场资料及中国160站月平均气温资料,运用小波分析、经验正交函数(EOF)分析等方法,分析了华北冬季气温和冬季北极涛动指数的变化特征及其关系。结果表明它们之间存在着显著相关,特别是在年代际尺度上关系尤其密切。华北在20世纪70年代初以前为持续冷冬,80年代中期之后变为持续暖冬,其间相对正常,而冬季北极涛动指数亦存在类似的3个阶段。冬季北极涛动高(低)指数年,华北地区为暖(冷)冬年。其原因在于,北极涛动在对流层低层和高层都可激发类似EU遥相关型的异常,通过影响西伯利亚高压和东亚大槽影响华北地区气温。强(弱)涛动年大气环流具有弱(强)东亚冬季风特征,西伯利亚高压减弱(增强),亚洲大陆地面东北风减弱(增强),高空东亚大槽减弱(增强)。
中文关键词:北极涛动  持续暖(冷)冬  环流异常
 
Relation between Arctic Oscillation and North China Air Temperature in Winter
Abstract:It is shown in this paper that North China winter air temperature bears a significant relation with Arctic Oscillation(AO),especially on a time scale of decades,by applying the methods such as wavelet analysis,EOF and correlation analysis and by using the AO index,the NCEP/NCAR reanalysis data and monthly mean air temperature at 160 stations in China.The North China winter air temperature was successively cold before 1970s but warm after 1980s,and the years between them were relatively normal.The winter AO index showed similar three-stage variations.When the winter AO index was high/low,North China winter was warm/cold.The reason may be that the AO can excite anomalies like the EU teleconnection pattern from low to high level in the troposphere which affect the Siberian High and East Asian Trough, thus influencing North China air temperature.High/low AO index years are characterized by weak/strong East Asian Winter Monsoon,weak/strong Siberian High and East Asian Trough and by weakened/strengthened northeast surface wind over Asian continent.
keywords:Arctic Oscillation  successive warm/cold winter  circulation anomaly
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