Decadal Variation of the Impact of La Nina on the Winter Arctic Stratosphere  

作　　者：Shuangyan YANG Tim LI Jinggao HU Xi SHEN 

机构地区：[1]Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environmental Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of lnformation Science and Technology, Nanjing 210044, China [2]International Pacific Research Center and Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA

出　　处：《Advances in Atmospheric Sciences》2017年第5期679-684,共6页大气科学进展（英文版）

基　　金：jointly supported by an NSFC project (Grant Nos.41505034,41630423);the China National 973 project (Grant No.2015CB453200);NSF (AGS1565653);NSFC project (Grant No.41475084);NRL (Grant No.N00173-161G906);Jiangsu NSF key project (Grant No.BK20150062);the Startup Foundation for Introducing Talent of NUIST (Grant No.2014R010);a project funded by the Jiangsu Shuang-Chuang Team (Grant No.R2014SCT001);the Startup Foundation for Introducing Talent of NUIST (Grant No.2014R010);the Priority Academic Program Development of Jiangsu Higher Education Institutions;the China Scholarship Council for funding and travel support

摘　　要：The impact of La Ni?a on the winter Arctic stratosphere has thus far been an ambiguous topic of research. Contradictory results have been reported depending on the La Ni?a events considered. This study shows that this is mainly due to the decadal variation of La Ni?a’s impact on the winter Arctic stratosphere since the late 1970 s. Specifically,during the period1951–78,the tropospheric La Ni?a teleconnection exhibits a typical negative Pacific–North America pattern,which strongly inhibits the propagation of the planetary waves from the extratropical troposphere to the stratosphere,and leads to a significantly strengthened stratospheric polar vortex. In contrast,during 1979–2015,the La Ni?a teleconnection shifts eastwards,with an anomalous high concentrated in the northeastern Pacific. The destructive interference of the La Ni?a teleconnection with climatological stationary waves seen in the earlier period reduces greatly,which prevents the drastic reduction of planetary wave activities in the extratropical stratosphere. Correspondingly,the stratospheric response shows a less disturbed stratospheric polar vortex in winter.The impact of La Ni?a on the winter Arctic stratosphere has thus far been an ambiguous topic of research. Contradictory results have been reported depending on the La Ni?a events considered. This study shows that this is mainly due to the decadal variation of La Ni?a's impact on the winter Arctic stratosphere since the late 1970 s. Specifically,during the period1951–78,the tropospheric La Ni?a teleconnection exhibits a typical negative Pacific–North America pattern,which strongly inhibits the propagation of the planetary waves from the extratropical troposphere to the stratosphere,and leads to a significantly strengthened stratospheric polar vortex. In contrast,during 1979–2015,the La Ni?a teleconnection shifts eastwards,with an anomalous high concentrated in the northeastern Pacific. The destructive interference of the La Ni?a teleconnection with climatological stationary waves seen in the earlier period reduces greatly,which prevents the drastic reduction of planetary wave activities in the extratropical stratosphere. Correspondingly,the stratospheric response shows a less disturbed stratospheric polar vortex in winter.

关 键 词：La Nina stratospheric polar vortex decadal variation planetary waves 

分 类 号：P732[天文地球—海洋科学]