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《Chinese Journal of Atmospheric Sciences》 2014-04
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Circulation Differences in Anomalous Rainfall over the Yangtze River and Huaihe River Valleys in Summer

ZHANG Qingyun;GUO Heng;International Center for Climate and Environment Sciences,Institute of Atmospheric Physics,Chinese Academy of Sciences;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Both the Yangtze River and the Huaihe River lie in mid-latitudes in East Asia,and so the large-scale circulation and climatic background of weather events in the Yangtze River valley and the Huaihe River valley are similar.However,there are different interannual variations between anomalous rainfall events in the Yangtze River valley and in the Huaihe River valley in summer.This study focuses on differences in circulation in middle to high latitudes in Asia and middle to low latitudes in the southern hemisphere,and the associated mechanisms.Both physical and statistical methods were used in this study.We looked at the differences in Asian circulation for anomalous rainfall events in the Yangtze River basin and the Huaihe River valley in summer.East Asian subtropical westerly winds at 200 hPa strengthened(weakened) and a longitudinal(zonal) pattern with anomalous geopotential height at 500 hPa occurred in middle to high latitudes over East Asia.Meanwhile,the locations of both the Australian anticyclone and the Mascarene anticyclone shifted further east(west),respectively,than normal,the cross-equatorial flow strengthened in the areas 150°E to 180° and weakened in the areas 50°E to 60°E(weakened in the areas 150°E to 180° and strengthened in the areas 50°E to 60°E),and anomalous rainfall in summer occurred in the Yangtze River valley(the Huaihe River valley).Thus,the intensity of East Asian subtropical westerly winds as well as the locations of both the Australian anticyclone and the Mascarene anticyclone played an important role in the occurrence of anomalous rainfall events in the Yangtze River valley and the Huaihe River valley in summer.
【Fund】: 国家自然科学基金项目41375055;; 全球变化研究国家重大科学研究计划项目2012CB957803;; 国家重点基础研究发展计划项目2013CB430201
【CateGory Index】: P434
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