The Interannual Variations of Summer Precipitation in the Northern Indian Ocean Associated with ENSO

作     者：YANG Ya-Li DU Yan WU Yan-Ling HUANG Gang ZHANG Yong-Sheng 

作者机构：Graduate University of Chinese Academy of Sciences Beijing 100049 China ~tate Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guang-~hou 510301 China Key Laboratory of Regional Climate-Environment Research for Temperate East Asia (RCE-TEA) Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing 100029 China Earth System Science Interdisciplinary Center (ESSIC) University of Maryland USA 

出 版 物：《Atmospheric and Oceanic Science Letters》 (大气和海洋科学快报（英文版）)

年 卷 期：2012年第5卷第4期

页      面：301-305页

学科分类：0710[理学-生物学] 081505[工学-港口、海岸及近海工程] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 070601[理学-气象学] 08[工学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the National Basic Research Program of China(973 Program,2010CB950302&2012 CB955603) the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.XDA05090404) the National Natural Science Foundation of China(41149908) 

主　　题：Indian summer monsoon ENSO interannual variability 

摘      要：Using rainfall data from the Global Precipita- tion Climatology Project （GPCP）, NOAA extended reconstruction sea surface temperature （ERSST）, and NCEP/NCAR reanalysis, this study investigates the interannual variation of summer rainfall southwest of the Indian Peninsula and the northeastern Bay of Bengal associated with ENSO. The composite study indicates a decreased summer rainfall southwest of the Indian Penin- sula and an increase in the northeastern Bay of Bengal during the developing phase, but vice versa during the decay phase of E1 Nifio. Further regression analysis dem- onstrates that abnormal rainfall in the above two regions is controlled by different mechanisms. Southwest of the Indian Peninsula, the precipitation anomaly is related to local convection and water vapor flux in the decay phase of E1 Nifio. The anomalous cyclone circulation at the lower troposphere helps strengthen rainfall. In the northeastern Bay of Bengal, the anomalous rainfall depends on the strength of the Indian southwest summer monsoon （ISSM）. A strong/weak ISSM in the developing/decay phase of E1 Nifio can bring more/less water vapor to strengthen/weaken the local summer precipitation.