Energetic processes regulating the strength of MJO circulation over the Maritime Continent during two types of El Ni?o

作     者：HSU Pang-Chi FU Zhen XIAO Ting HSU Pang-Chi;FU Zhen;XIAO Ting

作者机构：Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Nanjing China Joint International Research Laboratory of Climate and Environment Change Nanjing University of information Science &Technology Nanjing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of information Science & Technology Nanjing China Guangzhou Meteorological Observatory GuangzhouChina 

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

年 卷 期：2018年第11卷第2期

页      面：112-119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 National Natural Science Foundation of China[grant number 41375100] the National Basic Research Program of China[973 Program,grant number2015CB453200] the Natural Science Foundation of Jiangsu Province[grant number BK20140046] 

主　　题：MJO kinetic energy budget central Pacific and eastern Pacific El Ni(n)oscale interaction 

摘      要：The zonal shift of SST warming patterns associated with the eastern Pacific （EP） and central Pacific （CP） El Ni（n）o leads to a significant contrast in MJO strength over the Maritime *** MJO circulation tends to be stronger over the Maritime Continent during the mature phase （autumnwinter） of CP El Ni（n）o than of EP El Ni（n）*** on a new MJO kinetic energy （KE） budget equation,in which the effects of mean flow and high-frequency disturbances on the MJO are separated,we found that the low-level MJO gains more KE from the background mean flow during CP El Ni（n）o events,although at the same time the enhanced MJO transfers more KE to high-frequency *** the three-dimensional circulation anomalies,the low-level convergence and cyclonic anomalies associated with upward anomalies of the Walker circulation over the Maritime Continent play leading roles in inducing the enhanced barotropic energy conversion from mean flow to MJO during CP El Ni（n）o events relative to EP El Ni（n）o *** more vigorous MJO with strengthened vertical motion and heating anomalies at the upper troposphere can maintain its amplitude through the baroclinic energy conversion from the MJO available potential energy to *** the low-tomid tropospheric barotropic energy conversion from mean flow to MJO and upper-level baroclinic energy conversion contribute positively to the enhanced MJO over the Maritime Continent during CP El Ni（n）o years compared to during EP El Ni（n）o years.