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The Influence of Meridional Variation in North Pacific Sea Surface Temperature Anomalies on the Arctic Stratospheric Polar Vortex

查看全文 作　　者：Tao [1,2]WANG;Qiang [3]FU;Wenshou [1]TIAN;Hongwen [1]LIU;Yifeng [1]PENG;Fei [4]XIE;Hongying [1]TIAN;Jiali [1]LUO 高影响力作者 机构地区：[1]College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;[2]Key Laboratory of Western China's Environmental Systems of the Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;[3]Department of Atmospheric Sciences,University of Washington,Seattle 98101,USA;[4]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China高影响力机构 出　　处：《Advances in Atmospheric Sciences》索引2023年第40卷第12期,共17页高影响力期刊 基　　金：the National Natural Science Foundation of China(Grant Nos.42130601,42075060,and 41875046). 摘　　要：This study examines the dependence of Arctic stratospheric polar vortex(SPV)variations on the meridional positions of the sea surface temperature(SST)anomalies associated with the first leading mode of North Pacific SST.The principal component 1(PC1)of the first leading mode is obtained by empirical orthogonal function decomposition.Reanalysis data,numerical experiments,and CMIP5 model outputs all suggest that the PC1 events(positive-minus-negative PC1 events),located relatively northward(i.e.,North PC1 events),more easily weaken the Arctic SPV compared to the PC1 events located relatively southward(i.e.,South PC1 events).The analysis indicates that the North PC1-related Aleutian low anomaly is located over the northern North Pacific and thus enhances the climatological trough,which strengthens the planetary-scale wave 1 at mid-to-high latitudes and thereby weakens the SPV.The weakened stratospheric circulation further extends into the troposphere and favors negative surface temperature anomalies over Eurasia.By contrast,the South PC1-related Aleutian low anomaly is located relatively southward,and its constructive interference with the climatological trough is less efficient at high latitudes.Thus,the South PC1 events could not induce an evident enhancement of the planetary-scale waves at high latitudes and thereby a weakening of the SPV on average.The Eurasian cooling associated with South PC1 events(positive-minus-negative PC1 events)is also not prominent.The results of this study suggest that the meridional positions of the PC1 events may be useful for predicting the Arctic SPV and Eurasian surface temperature variations. 关 键 词：Arctic stratospheric polar vortex stratosphere-troposphere interactions North Pacific sea surface temperature Aleutian low
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