不同年代际背景下AO与冬季中国东北气温的关系  

Interdecadal Variation of Relationship between AO and Winter Temperature Interannual Variability in Northeast China

作　　者：庞子琴[1] 郭品文[1] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044

出　　处：《大气科学学报》2010年第4期469-476,共8页Transactions of Atmospheric Sciences

基　　金：国家科技支撑计划课题(2007BAC29B03)

摘　　要：采用1951—2006年北极涛动指数序列、NCEP/NCAR再分析资料和我国160站气温资料,利用滑动相关分析研究了不同年代际背景下北极涛动与冬季中国东北气温年际异常关系的变化情况。结果表明,两者的关系在20世纪60年代中后期显著增强,在80年代中后期减弱。不同年代际背景下,与AO相关联的中高纬度大气环流异常发生的明显改变是AO与东北冬季气温关系发生年代际变化的原因。强相关年代,西伯利亚高压与阿留申低压均明显减弱,东亚冬季风偏弱,对流层中下层异常东南风控制东北地区,对流层中层东亚大槽明显减弱,环流的经向性减弱,使该地区冬季气温偏高;相关较弱的年代则以上表现不明显。Interdecadal variation of the relationship between AO and winter temperature interannual variability in Northeast China is investigated by using techniques of sliding correlation analysis with the data of AO index from 1951 to 2006,the NCEP /NCAR reanalysis data and the air temperature obtained from 160 stations in China.The results indicate that their relationship obviously intensified in the late 1960＇s and weakened in the late 1980＇s.Significant differences existing in AO-related atmospheric circulation anomaly during different periods may be the reason for the interdecadal variation of the relationship between AO and surface air temperature in Northeast China.The Siberian high and Aleutian low become weaker during the significantly related period of the two factors,which made the winter monsoon in East Asia become weaker.In low-level troposphere,anomalous southeast air flow controls the Northeast China;in mid-level troposphere,East Asian Trough become weaker and thus the zonal circulation enhances in East Asian.All these factors make it warmer in Northeast China.

关 键 词：北极涛动 东北冬季气温 年际异常 年代际变化 

分 类 号：P467[天文地球—大气科学及气象学]