Modulation of Madden-Julian Oscillation Activity by the Tropical Pacific-Indian Ocean Associated Mode

作     者：Lifeng LI Xin LI Xiong CHEN Chongyin LI Jianqi ZHANG Yulong SHAN Lifeng LI;Xin LI;Xiong CHEN;Chongyin LI;Jianqi ZHANG;Yulong SHAN

作者机构：College of Meteorology and OceanographyNational University of Defense TechnologyNanjing 211101China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2020年第37卷第12期

页      面：1375-1388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] 0816[工学-测绘科学与技术] 0825[工学-航空宇航科学与技术] 

基　　金：We thank the anonymous reviewers for their careful comments and suggestions.This work was supported by the National Key Research and Development Program of China(Grant No.2018YFC1505901) the National Natural Science Foundation of China(Grant Nos.41605051,41520104008,41475070 and 41575062) 

主　　题：tropical Pacific-Indian Ocean associated mode MJO moisture budget analysis anomalous circulation 

摘      要：In this study,the impacts of the tropical Pacific–Indian Ocean associated mode(PIOAM)on Madden–Julian Oscillation(MJO)activity were investigated using reanalysis *** the positive(negative)phase of the PIOAM,the amplitudes of MJO zonal wind and outgoing longwave radiation are significantly weakened(enhanced)over the Indian Ocean,while they are enhanced(weakened)over the central and eastern *** eastward propagation of the MJO can extend to the central Pacific in the positive phase of the PIOAM,whereas it is mainly confined to west of 160°E in the negative *** PIOAM impacts MJO activity by modifying the atmospheric circulation and moisture *** ascending(descending)motion and positive(negative)moisture anomalies occur over the western Indian Ocean and central-eastern Pacific(Maritime Continent and western Pacific)during the positive phase of the *** anomalous circulation is almost the opposite in the negative phases of the *** anomalous circulation and moisture can modulate the activity of the *** stronger moistening over the Indian Ocean induced by zonal and vertical moisture advection leads to the stronger MJO activity over the Indian Ocean in the negative phase of the *** the positive phase of the PIOAM,the MJO propagates farther east over the central Pacific owing to the stronger moistening there,which is mainly attributable to the meridional and vertical moisture advection,especially low-frequency background state moisture advection by the MJO’s meridional and vertical velocities.