东亚冬季风三维环流的低频振荡特征  

THREE-DIMENSION VERTICAL CIRCULATION LFO FEATURES OF EASTERN ASIAN WINTER MONSOON

作　　者：唐东升[1] 王建德[1] 

机构地区：[1]南京气象学院气象系

出　　处：《南京气象学院学报》1994年第3期351-355,共5页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金

摘　　要：利用ＥＣＭＷＦ／ＷＭＯ逐日客观分析格点资料，采用带通滤波分析了冬季风环流的低频振荡特征，结果表明冬季风水平环流和垂直环流都表现出显著的准４０天振荡特征，高低层水平环流的低频变化主要受热带西太平洋和澳大利亚附近的低频涡旋系统的影响，纬向环流的低频变化表现为Ｗａｌｋｅｒ环流的加强和减弱。经向环流则在现为局地振荡特征，它的低频振荡起着联接南北半球和高低层季风环流低频振荡的作用。The low-frequency oscillation(LFO)features of East Asian winter monscon circulation are investigated in terms of ECMWF/WMO daily gridded data subjected to objective analysisand with a bandpass filter,Results show that both the horizontal and vertical circulations of themonscon have marked quasi-40-day LFO features. The low-frequency variations of the upper-andlower-level horizontal circulations are influenced largely by the low-frequency vortex systems nearAustralia and in the western tropical Pacific,The low-frequency variation in the zonal circulationis the manifestation of the strengthening and weakening of Walker circulation,with the meridional circulation shown by the localized LFO characteristics,which links the LFO’s of bihemisphericcirculations and those of the monsoon circulations at tipper and lower levels。

关 键 词：冬季风 低频振荡 三维环流 季风 

分 类 号：P434[天文地球—大气科学及气象学]