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《Chinese Journal of Geophysics》 2013-08
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Relationship between the first rainy season precipitation anomaly in South China and the sea surface temperature anomaly in the Pacific

QIANG Xue-Min1,2,YANG Xiu-Qun1* 1 School of Atmospheric Sciences,Nanjing University,Nanjing 210093,China 2 Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101,China  
This study investigates the variability of precipitation during the First Rainy Season(FRS) in South China and its relationship with the Sea Surface Temperature Anomaly(SSTA) in the Pacific,by using daily records of precipitation in South China and global analysis data of ocean and atmosphere for 1957—2004.The variability of the FRS precipitation over the past 50 years is characterized by a descending trend.There is a significant correlation between the SSTA in the Pacific and the FRS precipitation anomaly in South China.The dominant mode of the Pacific SSTA that can affect the FRS precipitation is characterized by an ENSO-like pattern with a significant SSTA center in the western Pacific warm pool region during the preceding winter.The preceding winter SSTA in such a key region bounded by 120°E—180°E and 20°S—20°N is identified as a precursor of the FRS precipitation anomaly.A possible mechanism by which the SSTA in the key region affects the FRS precipitation in South China is proposed.A positive SSTA in the key region of western Pacific warm pool but negative SSTA in the central and eastern equatorial Pacific in the preceding winter can cause anomalous convective activities around the Philippines and its surrounding areas which strengthen the equatorial Walker cell and the regional Hadley cell in mid and lower latitudes along the East Asia-Pacific sector and induce an East Asia-Pacific teleconnection wavetrain.Thus,the Western Pacific Subtropical High(WPSH) is strengthened and extends westward with its ridge line shifting northward during FRS,and the subtropical westerly jet stream is weakened and withdraws northward.As the ascending branch of the Hadley cell is reinforced,the descending movement in the subtropical East Asia is also intensified.Moreover,the water vapor transport to South China around the northern edge of WPSH is weakened.As a result,the convective activities over South China are suppressed and accordingly the precipitation during FRS is decreased.A negative SSTA in the key region of western Pacific warm pool can cause an opposite situation.The decreasing trend of the FRS precipitation in South China is associated with the warming trend of the preceding winter SSTA in the western Pacific warm pool.
【Fund】: 973项目(2010CB428504);; 江苏省自然科学基金创新学者攀登项目(BK2008027)联合资助
【CateGory Index】: P426.615
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