Extratropical Cyclones Act as a “Bridge” to the Concurrent Impact of ENSO on the Arctic Oscillation During Boreal Winter

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-10-16 DOI:10.1029/2025GL116719

Shengyi Qian, Haibo Hu, Kevin I. Hodges, Yimin Zhu, Xiu-Qun Yang, Yuanheng Wang

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Abstract

This study investigates that the concurrent influence of El Niño-Southern Oscillation (ENSO) on the Arctic Oscillation (AO) mediated through the poleward translation of extra-tropical cyclones (ECs) over the North Atlantic is more significant than the one-year-lagged impact of ENSO through poleward propagating atmospheric angular momentum. Specific results show that during El Niño (La Niña) winter, the anomalous atmospheric horizontal heat advection from the Pacific to the Atlantic, which is caused by the southward (northward) displacement of the westerly jet stream, enhances (weakens) the atmospheric baroclinicity over the subtropical North Atlantic. Subsequently, the changed baroclinicity drives intensified (reduced) baroclinic energy conversion from the eddy available potential energy to the eddy kinetic energy, which shifts the genesis locations of ECs southward (northward) and suppresses (enhances) their poleward translation into the Arctic. Ultimately, through the combined thermodynamic and dynamical forcing associated with EC activity, the negative (positive) AO pattern is generated in the concurrent winter.

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温带气旋充当了ENSO对北极冬季涛动同步影响的“桥梁”

本文研究了厄尔尼诺Niño -南方涛动（ENSO）通过北大西洋热带外气旋（ECs）的极向平移介导的北极涛动（AO）的同步影响比ENSO通过极向传播大气角动量介导的一年滞后影响更为显著。结果表明：El Niño （La Niña）冬季，西风急流南移（北移）引起的太平洋向大西洋的异常大气水平热平流增强（减弱）了副热带北大西洋上空的大气斜压性。随后，斜压性的变化驱动斜压能从涡有效势能向涡动能转换的增强（减弱），使ec的发生位置南移（北移），抑制（增强）其向北极的迁移。最终，通过与EC活动相关的热力和动力联合强迫，在同期冬季产生负（正）AO型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.