[主题报告]Eurasia’s transition from colder winters to hotter summers driven by North Atlantic air–sea interaction and Arctic sea ice anomalies

编号：56 稿件编号：238 访问权限：仅限参会人更新：2026-03-20 13:23:00 浏览：106次主题报告

报告开始：2026年04月26日 13:30 （Asia/Shanghai）

报告时间：20min

所在会议：[S1-14] 专题1.14 极地与中低纬气候系统相互作用 » [F5] 专题1.14 极地与中低纬气候系统相互作用

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Extreme cold winters and hot summers over Eurasia are intensifying under global warming, pos

ing substantial risks to agriculture, ecosystems, and human health. Here, we show that a colder

winter tends to be followed by a hotter summer over Eurasia. This winter-summer extreme tem

perature reversal is linked to the phase switch of the Arctic oscillation (AO) from winter to sum

mer, which is driven by the North Atlantic air–sea interaction and Arctic sea ice-atmosphere coup

ling. Specifically, a negative AO in winter weakens high-latitude westerlies, causing cold extremes

over Eurasia. Negative AO also induces a tripolar sea surface temperature anomaly in the North

Atlantic that persists into the following summer and triggers positive AO-like atmospheric anom

alies, leading to a hotter summer across Eurasia. Moreover, winter atmospheric anomalies reduce

the Barents–Kara sea ice through horizontal moisture transport. This sea ice loss persists into

summer and contributes to the formation of positive AO-like atmospheric anomalies. These pro

cesses establish a cross-seasonal transition from extreme cold winters to extreme hot summers over

Eurasia, offering new insight into the prediction of summer extreme events.

极端事件、北极海冰、北大西洋海气相互作用