Combined impact of in-phase and out-of-phase variation between the northern East Asian low and western North Pacific subtropical high on East Asian summer rainfall  

作　　者：DU Meng-Xing LIN Zhong-Da LU Ri-Yu 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences [2]College of Earth Science, University of Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2017年第4期284-290,共7页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China[grant number 41375086]

摘　　要：East Asian summer rainfall is affected by both the continental northern East Asian low （NEAL） and the western North Pacific subtropical high （WNPSH） in the lower troposphere. This study investigates the joint effect of the two circulation factors on East Asian summer rainfall. It is found that the rainfall in East Asia behaves differently in the years with in-phase and out-of-phase variation between the NEAL and WNPSH. When the NEAL and WNPSH vary in phase, i.e. when they are both stronger, the rainfall anomaly shows a dipole pattern in East Asia and displays opposite changes between north and south of 30°N. When the two circulation factors vary out of phase, the rainfall anomaly is concentrated in the Yangtze River valley.东亚夏季降水受到对流层低层的东北亚陆地低压和西北太平洋副热带高压(西太副高)的影响。本文采用NCEP/NCAR再分析资料,考察了东北亚低压和西太副高同位相变化及反位相变化对东亚夏季降水的影响。研究发现与环流系统同位相和反位相对应,东亚夏季降水呈现不同的变化特征。当东北亚低压和西太副高同位相变化时,东亚地区降水异常为偶极子型,表现为长江南北降水变化相反;而当两环流系统处于反位相变化时,降水异常主要集中在长江流域。

关 键 词：Northern East Asian low western North Pacificsubtropical high East Asiansummer rainfall interannualvariation 

分 类 号：P426.6[天文地球—大气科学及气象学]