中国海洋大学学报（自然科学版）2026，Vol.56Issue(2)：13-24,12.DOI:10.16441/j.cnki.hdxb.20250086
极端北极反气旋环流的频发加强及其与"暖北极-冷大陆"模态的联系
Increasing and Intensifying of Extreme Arctic Anticyclonic Circulation and Its Linkage with the Warm Arctic-Cold Continents Pattern
摘要
Abstract
This paper defines the positive anomaly of 500 hPa geopotential height north of 65°N as Arc-tic anticyclonic circulation(AAC).Using the percentile threshold(95th)method,641 days of extreme AAC(EAAC)events are identified.EAAC occurs most frequently and intensely in winter(December to March),showing a significant upward trend,with occurrence days decreasing in the Pacific sector,the Atlantic sector,and the Eurasian sector of the Arctic.The strengthening of EAAC in these sectors and its linkage with the"warm Arctic-cold continents"(WACC)pattern are associated with abnormal upper-level jet stream changes modulating Rossby wave development at middle-high latitudes.In the Pacific sector,weakened zonal winds at the East Asian-North Pacific jet exit enhance the Alaska ridges,leading to"warm Arctic"conditions;cold advection from cut-off lows forms"cold continents".In the North Atlantic,asymmetric zonal wind changes at the jet exit increase cyclonic vorticity,strengthening the Greenland ridges and inducing EAAC and WACC.In Eurasia,a northward-shifted westerly jet and anomalous easterlies promote Rossby wave propagation,enhancing cyclonic vorticity and shifting the polar vortex,thus strengthening EAAC and forming WACC.This study offers a new perspective on Arctic-midlatitude climate linkages.关键词
极端北极反气旋环流/太平洋扇区/大西洋扇区/欧亚扇区/"暖北极-冷大陆"模态/罗斯贝长波脊Key words
extreme Arctic anticyclonic circulation/the Pacific sector/the Atlantic sector/the Eura-sian sector/warm Arctic-cold continent pattern/Rossby wave ridges分类
天文与地球科学引用本文复制引用
张涵,赵传湖,杨宇星,黄菲..极端北极反气旋环流的频发加强及其与"暖北极-冷大陆"模态的联系[J].中国海洋大学学报（自然科学版）,2026,56(2):13-24,12.基金项目
国家自然科学基金项目(42430411,42075024) （42430411,42075024）
中央高校基本科研业务费专项(202561001)资助Supported by the National Natural Science Foundation of China(42430411,42075024) （202561001）
the Fundamental Research Funds for the Cen-tral Universities(202561001) （202561001）
