Lagrangian Perspective on the Origins of Denmark Strait Overflow

Lagrangian Perspective on the Origins of Denmark Strait Overflow
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丹麦海峡溢流起源的拉格朗日视角

DOI:
10.1175/jpo-d-19-0210.1
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发表时间:
2020
影响因子:
3.5
通讯作者:
Bower, Amy
Bower, Amy
中科院分区:
地球科学2区
文献类型:
--
作者:
Saberi, Atousa;Haine, Thomas W.;Gelderloos, Renske;Femke de Jong, M.;Furey, Heather;Bower, Amy

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丹麦海峡溢流(DSO)是大西洋经向翻转环流(AMOC)下端的重要贡献因子。确定DSO的形成及其路径不仅对当地海洋学具有重要意义,而且对于估计AMOC的状态和变异性也是至关重要的。尽管之前曾试图了解DSO的来源,但由于短期(3-5天)的可变性,其上游路径和环流仍然不确定。这就使得从观测数据研究DSO变得具有挑战性。考虑到这种复杂性,本研究在现实的海洋数值模拟中使用拉格朗日回溯DSO源,绘制了其水性质的上游路径和沿路径的变化。拉格朗日路径证实,有几个分支来自北部,如东格陵兰流(EGC)、分离的EGC(SEGC)和北冰岛急流(NIJ)。此外,模式结果还揭示了来自冰岛南部的其他路径,在2008年冬季,当NAO指数为正时,冰岛南部提供了超过16%的DSO和超过25%的DSO。截至3月底,南方的贡献约为34%。南部路径标志着从近地表亚极地北大西洋到北大西洋深水(NADW)的一条更直接的路线,需要通过现场观测进一步探索。
The Denmark Strait Overflow (DSO) is an important contributor to the lower limb of the Atlantic meridional overturning circulation (AMOC). Determining DSO formation and its pathways is not only important for local oceanography but also critical to estimating the state and variability of the AMOC. Despite prior attempts to understand the DSO sources, its upstream pathways and circulation remain uncertain due to short-term (3–5 days) variability. This makes it challenging to study the DSO from observations. Given this complexity, this study maps the upstream pathways and along-pathway changes in its water properties, using Lagrangian backtracking of the DSO sources in a realistic numerical ocean simulation. The Lagrangian pathways confirm that several branches contribute to the DSO from the north such as the East Greenland Current (EGC), the separated EGC (sEGC), and the North Icelandic Jet (NIJ). Moreover, the model results reveal additional pathways from south of Iceland, which supplied over 16% of the DSO annually and over 25% of the DSO during winter of 2008, when the NAO index was positive. The southern contribution is about 34% by the end of March. The southern pathways mark a more direct route from the near-surface subpolar North Atlantic to the North Atlantic Deep Water (NADW), and needs to be explored further, with in situ observations.
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