The Interannual Wintertime Climate Modes Over Mid‐High Latitude Eurasia and Their Climate Impacts

遥相关 气候学 位势高度 经验正交函数 北大西洋涛动 北极涛动 纬度 气候模式 北方的 中纬度 大西洋年代际振荡 环境科学 罗斯比波 地质学 气候变化 地理 降水 海洋学 北半球 厄尔尼诺南方涛动 气象学 古生物学 大地测量学
作者
Xinyou Zhang,Xuguang Sun,Shuai Yuan,Zhiqi Zhang,Xiu‐Qun Yang,Jiabei Fang
出处
期刊:Journal Of Geophysical Research: Atmospheres [Wiley]
卷期号:129 (2)
标识
DOI:10.1029/2023jd039764
摘要

Abstract Eurasian teleconnection pattern (EU) and its two variants (EU1 and EU2) are the representative wintertime atmospheric teleconnections over Eurasian continent. They are mainly indicative of the local features and closely related to other teleconnection patterns. What are the major interannual climate modes over mid‐high latitude Eurasia in boreal winter is still an open question. With the ERA5 reanalysis data sets after removing the linear impact of El Niño‐Southern Oscillation (ENSO), three wintertime climate modes over mid‐high latitude Eurasia are identified by the first three empirical orthogonal function (EOF) modes of the anomalous relative tendency (ART) of 500 hPa geopotential height. They approximately explain 75% of the interannual variance in total. The three climate modes have combined features of EU‐like patterns with Arctic Oscillation (AO), North Atlantic Oscillation (NAO) and West Atlantic (WA) teleconnections, respectively, and they are named EU‐AO, EU‐NAO and EU‐WA climate modes accordingly. All the three climate modes originate mainly from the North Atlantic and demonstrate clear Rossby wave trains downstream to East Asia along the great circle route, and they can be primarily stimulated and maintained by positive air‐sea feedback over North Atlantic regarding to the obvious North Atlantic tripole‐like sea surface temperature patterns. Interannual climate variations over the most Eurasian continent are strongly linked to and well reproduced by the three ENSO‐independent climate modes, which can be applied as the important signals for monitoring and predicting winter interannual climate variabilities over mid‐high latitude Eurasia.
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