Strengthened Relationship between the Antarctic Oscillation and ENSO After the Mid-1990s during Austral Spring

作     者：Tingting HAN Huijun WANG Jianqi SUN 

作者机构：Nansen-Zhu International Research CentreInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Climate Change Research CenterChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological DisasterMinistry of EducationNanjing University for Information Science and TechnologyNanjing 210044China University of Chinese Academy of SciencesBeijing 100049China 

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

年 卷 期：2017年第34卷第1期

页      面：54-65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：jointly supported by the National Natural Science Foundation of China(Grant Nos.41421004 and 41210007) the Special Fund for Public Welfare Industry(Meteorology)(Grant No.GYHY201306026) 

主　　题：ENSO Antarctic Oscillation South Pacific SST austral spring decadal change 

摘      要：This paper documents a decadal strengthened co-variability of the Antarctic Oscillation （AAO） and ENSO in austral spring after the mid-1990s. During the period 1979-93, the ENSO （AAO） spatial signatures are restricted to the tropicsmidlatitudes （Antarctic-midlatitudes） of the Southern Hemisphere （SH）, with a weak connection between the two oscillations. Comparatively, after the mid-1990s, the E1 Nifio-related atmospheric anomalies project on a negative AAO pattern with a barotropic structure in the mid-high latitudes of the SH. The expansion of E1 Nifio-related air temperature anomalies have a heightened impact on the meridional thermal structure of the SH, contributing to a weakened circumpolar westerly and strengthened subtropical jet. Meanwhile, the ENSO-related southern three-cell circulations expand poleward and then strongly couple the Antarctic and the tropics. Numerical simulation results suggest that the intensified connection between ENSO and SST in the South Pacific since the mid-1990s is responsible for the strengthened AAO-ENSO relationship.