A Cross-Seasonal Linkage between Arctic Sea Ice and Eurasian Summertime Temperature Fluctuations

查看全文 作　　者：Yanting [1]LIU;Yang [1]ZHANG;Sen [2]GU;Xiu-Qun [1]YANG;Lujun [1]ZHANG

机构地区：[1]School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China;[2]College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073,China

出　　处：《Advances in Atmospheric Sciences》索引2023年第40卷第12期,共16页

基　　金：the National Key Research and Development Program under Grant 2022YFE0106900;the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant XDA2010030804;the National Natural Science Foundation of China under Grant No.41621005. 摘　　要：This study explores the linkage between summertime temperature fluctuations over midlatitude Eurasia and the preceding Arctic sea ice concentration (SIC) by utilizing the squared norm of the temperature anomaly, the essential part of local eddy available potential energy, as a metric to quantify the temperature fluctuations with weather patterns on various timescales. By comparing groups of singular value decomposition (SVD) analysis, we suggest a significant linkage between strong (weak) August 10-to-30-day temperature fluctuations over mid-west Asia and enhanced (decreased) Barents-Kara Sea ice in the previous February. We find that when the February SIC increases in the Barents-Kara Sea, a zonal dipolar pattern of SST anomalies appears in the Atlantic subpolar region and lasts from February into the summer months. Evidence suggests that in such a background state, the atmospheric circulation changes evidently from July to August, so that the August is characterized by an amplified meridional circulation over Eurasia, weakened westerlies, and high- pressure anomalies along the Arctic coast. Moreover, the 10-to-30-day wave becomes more active in the North Atlantic-Barents-Kara Sea-Central Asia regions and manifests a more evident southward propagation from the Barents- Kara Sea into the Ural region, which is responsible for the enhanced 10-to-30-day wave activity and temperature fluctuations in the region. 关键词：Arctic sea ice midlatitude atmospheric circulation summertime temperature fluctuations wave train North Atlantic SST

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A Cross-Seasonal Linkage between Arctic Sea Ice and Eurasian Summertime Temperature Fluctuations

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