Asymmetric Features for Two Types of ENSO  

作　　者：李智玉 徐海明 张文君 

机构地区：[1]Key Laboratory of Meteorological Disaster of Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology [2]College of Atmospheric Sciences,Nanjing University of Information Science & Technology

出　　处：《Journal of Meteorological Research》2015年第6期896-916,共21页气象学报（英文版）

基　　金：Supported by the National(Key)Basic Research and Development(973)Program of China(2012CB955602);National Natural Science Foundation of China(41275094,41490643,and 41575077);Priority Academic Development Program of Jiangsu Higher Education Institutions;Qing-Lan Project of Jiangsu Province

摘　　要：There are two types of ENSO,namely,the eastern Pacific（EP） ENSO that is characterized by the warmest（coldest） SST anomalies in the eastern equatorial Pacific,and the central Pacific（CP） ENSO whose maximum（minimum） SST anomalies are over the central equatorial Pacific.Asymmetric features of SST anomalies for the EP and CP types of ENSO events and their possible mechanisms were analyzed by using a variety of data during the period 1961-2010.The responses of atmospheric circulation to the two types of ENSO were also discussed.The results showed asymmetric features of SST anomalies in terms of spatial and temporal distributions and intensity.Although the dominant mechanisms differed at both development and decay stages,the oceanic vertical advection played a key role in the asymmetric intensity of the two ENSO events.In addition,both local and remote atmospheric responses showed strong asymmetric signals,which were consistent with the asymmetric distribution of SST anomalies.The asymmetric atmospheric responses in EP-ENSO（CP-ENSO） were similar to those associated with EP-El Nino（CP-La Nina）.The intensity of asymmetric responses related to the EP-ENSO was much stronger than that related to the CP-ENSO.There are two types of ENSO,namely,the eastern Pacific（EP） ENSO that is characterized by the warmest（coldest） SST anomalies in the eastern equatorial Pacific,and the central Pacific（CP） ENSO whose maximum（minimum） SST anomalies are over the central equatorial Pacific.Asymmetric features of SST anomalies for the EP and CP types of ENSO events and their possible mechanisms were analyzed by using a variety of data during the period 1961-2010.The responses of atmospheric circulation to the two types of ENSO were also discussed.The results showed asymmetric features of SST anomalies in terms of spatial and temporal distributions and intensity.Although the dominant mechanisms differed at both development and decay stages,the oceanic vertical advection played a key role in the asymmetric intensity of the two ENSO events.In addition,both local and remote atmospheric responses showed strong asymmetric signals,which were consistent with the asymmetric distribution of SST anomalies.The asymmetric atmospheric responses in EP-ENSO（CP-ENSO） were similar to those associated with EP-El Nino（CP-La Nina）.The intensity of asymmetric responses related to the EP-ENSO was much stronger than that related to the CP-ENSO.

关 键 词：EP-ENSO CP-ENSO air-sea coupled features asymmetry 

分 类 号：P732[天文地球—海洋科学] TG806[金属学及工艺—公差测量技术]