Redrawing the Iceland−Scotland Overflow Water pathways in the North Atlantic

Redrawing the Iceland−Scotland Overflow Water pathways in the North Atlantic
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重新绘制北大西洋冰岛和苏格兰溢流水道

DOI:
10.1038/s41467-020-15513-4
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发表时间:
2020
影响因子:
16.6
通讯作者:
Xu, Xiaobiao
Xu, Xiaobiao
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zou, Sijia;Bower, Amy;Furey, Heather;Susan Lozier, M.;Xu, Xiaobiao

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冰岛-苏格兰溢流水(ISOW)是从挪威海流入北大西洋的主要深水团,是全球经向翻转环流的一部分。 ISOW 历来被描述为在北大西洋副极地周围的深层边界流中逆时针流动,但这种单边界跟踪路径正受到新的拉格朗日观测和模型模拟的挑战。我们在这里显示,ISOW 在流过查理-吉布斯断裂带后离开边界,向拉布拉多盆地和伊明格盆地中部扩散到内部。我们还描述了新观察到的 ISOW 沿大西洋中脊西侧向南的路径。这些路径的划分被证明受到北大西洋洋流的深层涡流和曲流的影响。我们的结果与之前的研究相结合,要求对整个北大西洋 ISOW 路径的历史描述进行修订。
Iceland-Scotland Overflow Water (ISOW) is a primary deep water mass exported from the Norwegian Sea into the North Atlantic as part of the global Meridional Overturning Circulation. ISOW has historically been depicted as flowing counter-clockwise in a deep boundary current around the subpolar North Atlantic, but this single-boundary-following pathway is being challenged by new Lagrangian observations and model simulations. We show here that ISOW leaves the boundary and spreads into the interior towards the central Labrador and Irminger basins after flowing through the Charlie-Gibbs Fracture Zone. We also describe a newly observed southward pathway of ISOW along the western flank of the Mid-Atlantic Ridge. The partitioning of these pathways is shown to be influenced by deep-reaching eddies and meanders of the North Atlantic Current. Our results, in tandem with previous studies, call for a revision in the historical depiction of ISOW pathways throughout the North Atlantic.
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发表时间: 2017-04
影响因子: 4.1
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