Thermodynamic effect dictates influence of the Atlantic Multidecadal Oscillation on Eurasia winter temperature

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2024年6月27日

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Huan Wang,
Zhiyan Zuo,
Renhe Zhang,
Li Peng,
Kaiwen Zhang,
Deliang Chen,
Dong Xiao,
Qinglong You,
Guokun Dai,
Ruonan Zhang,
Haijun Yang,
Xiaodan Chen,
Zouxing Lin,
Peiqiang Xu,
Liang Qiao

摘要

The Atlantic Multidecadal Oscillation (AMO) has garnered attention for its important role in shaping surface air temperature (SAT) patterns over Eurasia. While Eurasian winter SAT was traditionally attributed to changes in large-scale atmospheric circulations associated with the AMO, a careful examination of the latest unforced CMIP6 simulations in this study unveils a significant contribution of the AMO’s thermodynamic effects. Specifically, the heat released from the North Atlantic Ocean and transported to northern Eurasia through westerlies takes precedence over the effect of dynamic Rossby waves, resulting in warm (cold) phases during positive (negative) AMO cycles, along with increased (decreased) warm extremes and reduced (enhanced) cold extremes. This study contributes to an improved understanding of the dominating mechanism of the AMO’s impact on Eurasian SAT.