Effects of air-sea coupling on the eastward propagating boreal winter intraseasonal oscillation over the tropical Indian Ocean

作     者：LI Chun-Hui LIN Ai-Lan Tim Ll LI Chun-Hui;LIN Ai-Lan;Tim Ll

作者机构：Key Laboratory of Regional Numerical Weather PredictionInstitute of Tropical and Marine MeteorologyChina Meteorological AdministrationDepartment of MeteorologyUniversity of HawaiiInternational Laboratory on Climate and Environment Change and Key Laboratory of Meteorological DisasterNanjing University of Information Science and Technolog 

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

年 卷 期：2017年第10卷第1期

页      面：51-57页

核心收录：

学科分类：0710[理学-生物学] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 070601[理学-气象学] 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[grant number 2014CB953901],support from the National Basic Research Program of China[grant number 2015CB453200] the National Natural Science Foundation of China[grant numbers 41675096,41575043,41375095,and 41505067],the National Natural Science Foundation of China[grant numbers 41475084 and 41630423] 

主　　题：Air-sea coupling boreal winter intraseasonal oscillations tropical Indian Ocean interannual variation 

摘      要：The effects of air-sea coupling over the tropical Indian Ocean（TIO） on the eastward propagating boreal winter intraseasonal oscillation（MJO） are investigated by comparing a fully coupled and a partially decoupled Indian Ocean experiment using the SINTEX-F coupled ***-sea coupling over the TIO significantly enhances the intensity of the eastward propagations of the MJO along the5°-10°S zonal *** zonal asymmetry of the SST anomaly（SSTA） is responsible for the enhanced eastward propagation.A positive SSTA appears to the east of the MJO convection,which results in the boundary layer moisture convergence and positively feeds back to the MJO *** addition,the air-sea interaction effect on the eastward propagation of the MJO is related to the interannual variations of the ***-sea coupling enhances（reduces） the eastward-propagating spectrum during the negative Indian Ocean dipole mode and positive Indian Ocean basin *** phase dependence is attributed to the role of the background mean westerly in affecting the wind-evaporation-SST ***-sea coupling（decoupling） enhances（reduces） the zonal asymmetry of the low-level specific humidity,and thus the eastward propagation spectrum of the MJO.