Advective timescales and pathways of Agulhas leakage

Advective timescales and pathways of Agulhas leakage
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厄加勒斯泄漏的平流时间尺度和路径

DOI:
10.1002/grl.50782
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发表时间:
2013
影响因子:
5.2
通讯作者:
A. Biastoch
A. Biastoch
中科院分区:
地球科学1区
文献类型:
--
作者:
S. Rühs;Jonathan V. Durgadoo;E. Behrens;A. Biastoch

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目前的研究表明,在过去和未来几十年里,阿古拉斯的泄漏量有所增加。这种变化可能会改变大西洋经向翻转环流的强度,特别是通过正密度异常平流进入北大西洋。为了探索Agulhas泄漏的命运,我们对拉格朗日分析的结果进行了评估,在允许涡流的海洋模型(ORCA025)中使用了虚拟浮子平流。相当一部分阿古拉斯泄漏到达副热带北大西洋:在平均15.3 Sv的阿古拉斯泄漏输送中,在6°S、6°N和26°N分别有9.7、7.7和6.1 Sv横断面进入南大西洋。泄漏到达相应纬度的最可能的传输时间是一到二十年。我们认为,阿古拉斯泄漏的变化最有可能在20年内体现在墨西哥湾流状态中。这些结果得到了海洋模式涡解析实现(INALT01)的支持。
Current research indicates an increase in Agulhas leakage for the past and coming decades. This change potentially alters the strength of the Atlantic meridional overturning circulation, in particular, through advection of positive density anomalies into the North Atlantic. To explore the fate of Agulhas leakage, results from a Lagrangian analysis were evaluated, with virtual floats advected within an eddy‐permitting ocean model (ORCA025). A considerable fraction of Agulhas leakage reached the subtropical North Atlantic: of a mean Agulhas leakage transport of 15.3 Sv entering the South Atlantic, 9.7, 7.7, and 6.1 Sv crossed sections at 6°S, 6°N, and 26°N, respectively. The most probable transit time of leakage to reach the respective latitudes is one to two decades. We suggest that changes in Agulhas leakage could manifest in the Gulf Stream regime most probably within two decades. These results were supported by an eddy‐resolving implementation of the ocean model (INALT01).
DOI: 10.1038/nature08519
发表时间: 2009-11-26
期刊: NATURE
影响因子: 64.8
作者:
Biastoch, A.;Boening, C. W.;Lutjeharms, J. R. E.
通讯作者: Lutjeharms, J. R. E.
DOI: 10.1038/nature07426
发表时间: 2008-11-27
期刊: NATURE
影响因子: 64.8
作者:
Biastoch, A.;Boening, C. W.;Lutjeharms, J. R. E.
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