A spurious positive Indian Ocean Dipole in 2017

作     者：Lianyi Zhang Yan Du Wenju Cai 

作者机构：South China Sea Institute of Oceanology Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences Physical Oceanography Laboratory/CIMSST Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Centre for Southern Hemisphere Oceans Research CSIRO Marine and Atmospheric Research 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2018年第63卷第18期

页      面：1170-1172页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the State Oceanic Administration of China (GASI-IPOVAI-02) the National Natural Science Foundation of China (41525019, 41521005) the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA11010103) the National Basic Research Program of China (2018YFA0605704) supported by a joint research Centre for Southern Hemisphere Ocean Research (CSHOR) between QNLM and CSIRO sponsored by NASA Earth Science funding, available at www.remss.com 

主　　题：印度洋偶极子 热带印度洋 海表面温度 SST 子模式 DMI 海洋 

摘      要：The Indian Ocean Dipole (IOD) is an intrinsic ocean-atmosphere coupled mode in the tropical Indian Ocean (IO)[1,2]. It features a sea surface temperature (SST) anomaly gradient, defined by the dipole mode index (DMI), the difference of area-averaged SST anomaly between the western tropical IO (50°–70°E, 10°N–10°S)and the southeastern tropical IO (90°–110°E, Eq.-10°S). The IOD event tends to develop and mature in the boreal summer and fall seasons. When a positive IOD (p IOD) occurs, SST warms up in the west and cools down in the east, which sets up an east-west pressure gradient. The atmosphere hence responds to the