Sea surface temperature anomaly in the tropical North Atlantic during El Nino decaying years

作     者：Xinyu Duan Feng Xue Fei Zheng Xinyu Duan;Feng Xue;Fei Zheng

作者机构：International Center for Climate and Environment SciencesInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Climate Center of Meteorological Bureau of Gansu ProvinceLanzhouChina 

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

年 卷 期：2021年第14卷第6期

页      面：14-19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 Founda-tion of China[grant numbers 41630530 and 41861144015] the National Key Scientific and Technological Infrastructure project“Earth System Science Numerical Simulator Facility” 

主　　题：Tropical North Atlantic Sea surface temperature anomaly North Atlantic Oscillation El Nino 

摘      要：Based on reanalysis data from 1979 to 2016,this study focuses on the sea surface temperature(SST)anomaly of the tropical North Atlantic(TNA)in El Nino decaying *** TNA SST exhibits a clear warm trend during this *** composite result for 10 El Nino events shows that the TNA SST anomaly reaches its maximum in spring after the peak of an El Nino event and persists until *** general,the anomaly is associated with three factors-namely,El Nino,the North Atlantic Oscillation(NAO),and a long-term trend,leading to an increase in local SST up to 0.4℃,0.3℃,and 0.35℃,respectively.A comparison between 1983 and 2005 indicates that the TNA SST in spring is affected by El Niño,as well as the local SST in the preceding winter,which may involve a long-term trend *** addition,the lead-lag correlation shows that the NAO leads the TNA SST by 2-3 *** comparing two years with an opposite phase of the NAO in winter(i.e.,1992 and 2010),the authors further demonstrate that the NAO is another important factor in regulating the TNA SST anomaly.A negative phase of the NAO in winter will reinforce the El Nino forcing substantially,and vise *** other words,the TNA SST anomaly in the decaying years is more evident if the NAO is negative with El ***,the combined effects of El Nino and the NAO must be considered in order to fully understand the TNA SST variability along with a long-term trend.