Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016.

Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016.
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DOI:
10.1098/rsta.2022.0183
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发表时间:
2023-12-11
影响因子:
5
通讯作者:
Jackson, Laura C.
Jackson, Laura C.
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Chafik, Leon;Holliday, N. Penny;Bacon, Sheldon;Baker, Jonathan A.;Desbruyeres, Damien;Frajka-Williams, Eleanor;Jackson, Laura C.

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副极地北大西洋的翻转环流在地球气候变率和变化中起着重要作用。在这里,我们从观测结果中发现,自2016年以来,SPNA东部的最近变暖期涉及到涡旋边界处的西部边界密度增加,这可能是由于浮力强迫增强,这是对自2010年代初以来北大西洋涛动强烈增加的响应。由于这些深正密度异常沿沿着西部边界向南传播,它们增强了北大西洋海流和相关的涡旋间区域的纬向热输送,导致亚热带热量流入SPNA东部。根据这一系列事件的发生时间,我们得出结论,自2016年以来的最近变暖阶段主要与观察到的深层西部边界密度变化机制有关,这是这些相互作用中的一个重要因素。这篇文章是一个讨论会议的问题“大西洋翻转:新的观察和挑战”的一部分。
The overturning circulation of the subpolar North Atlantic (SPNA) plays a fundamental role in Earth’s climate variability and change. Here, we show from observations that the recent warming period since about 2016 in the eastern SPNA involves increased western boundary density at the intergyre boundary, likely due to enhanced buoyancy forcing as a response to the strong increase in the North Atlantic Oscillation since the early 2010s. As these deep positive density anomalies spread southward along the western boundary, they enhance the North Atlantic Current and associated meridional heat transport at the intergyre region, leading to increased influx of subtropical heat into the eastern SPNA. Based on the timing of this chain of events, we conclude that this recent warming phase since about 2016 is primarily associated with this observed mechanism of changes in deep western boundary density, an essential element in these interactions. This article is part of a discussion meeting issue ‘Atlantic overturning: new observations and challenges’.
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