冬季西太平洋遥相关型的环流结构特征及其与我国冬季气温和降水的关系  

CIRCULATION STRUCTURE FEATURES OF WESTERN PACIFIC TELECONNECTION PATTERN IN WINTER AND THEIR RELATION WITH CHINA'S TEMPERATURE AND PRECIPITATION IN WINTER

作　　者：李勇[1] 何金海[1] 姜爱军[1] 周兵[2] 

机构地区：[1]南京信息工程大学大气科学系,江苏210044 [2]中国气象局气象中心,北京100081

出　　处：《气象科学》2007年第2期119-125,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金(编号:90211011);江苏省气象科学研究所研究基金共同资助

摘　　要：用近55 a资料研究了冬季西太平洋遥相关型(WP)异常环流特征及其与我国冬季天气气候的关系。结果表明:冬季西太平洋遥相关型与我国冬季天气气候关系密切。高指数年500 hPa高度场亚洲大陆上空中高纬为负高度异常,中纬度西风偏强,环流呈纬向型,对应海平面气压场上西伯利亚高压偏弱,东亚冬季风偏弱;低指数年情况相反。冬季西太平洋遥相关指数与我国冬季气温和降水存在显著的大范围正相关,与气温的高相关区为我国东部、南部沿海及西南地区所形成的U型区域,而与降水的高相关区则主要分布在我国东部地区。Based on recent 55-year data,analysis is done of the circulations anomalies features associated with the western Pacific teleconnection pattern （WP） in winter and the relation to China＇s winter weather-climate. Results show that the winter climate of China is closely related to the WP teleconnection pattern. In the higher （lower） index years,negative （positive） anomalies appear in the middle-high latitude at 500 hPa height field,the middle-latitude west wind is strengthened （weakened）, the circulation is zonal （meridional） pattern. Accordingly, the Siberian High and the East Asian winter monsoon are weaker （stronger） than normal. Moreover, the WP index positively correlates to the winter temperature and precipitation in China. In temperature aspect, significant correlations are concentrated in a region shaped like U capital,which begins from the eastern coast, goes to the south, then turns to the southwest region, while only eastern region of China is significant with respect to precipitation.

关 键 词：西太平洋遥相关型 环流异常 冬季气温降水 

分 类 号：P462[天文地球—大气科学及气象学]