北极海冰与欧亚夏季温度波动之间的跨季节联系，这一成果由南京大学张洋及其课题组成员经过不懈努力而取得。2023年12月10日出版的《大气科学进展》杂志发表了这项成果。

通过比较多组奇异值分解(SVD)分析，该课题组人员认为亚洲中西部8月10-30天的强(弱)温度波动与前一年2月巴伦支海—喀拉海冰的增强(减少)之间存在显著联系。研究发现，当巴伦支海—喀拉海地区2月份SIC升高时，大西洋亚极区出现一个纬向偶极子的SST异常，并从2月持续到夏季。

有证据表明，在这种背景状态下，7-8月大气环流变化明显，因此，8月的特点是欧亚大陆上空的经向环流增强，西风带减弱，北极沿岸高压异常。此外，10-30天的波在北大西洋—巴伦支海—喀拉海—中亚地区变得更加活跃，并在巴伦支海—喀拉海向乌拉尔地区表现出更明显的向南传播，这是造成该地区10-30天波活动和温度波动增强的原因。

据了解，本研究利用温度异常的平方范数(局地涡旋有效势能的基本部分)，作为在不同时间尺度上用气候模式量化温度波动的度量，来探讨欧亚中纬度地区夏季温度波动与北极海冰浓度(SIC)之间的联系。

附：英文原文

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

Author: Yanting LIU, Yang ZHANG, Sen GU, Xiu-Qun YANG, Lujun ZHANG

Issue&Volume: 2023-12-10

Abstract: 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.

DOI: 10.1007/s00376-023-2313-5

Source: http://www.iapjournals.ac.cn/aas/en/article/doi/10.1007/s00376-023-2313-5viewType=HTML