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Decoupling of the Agulhas Leakage from the Agulhas Current

机译：Agulhas泄漏与Agulhas电流的解耦

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摘要

The relationship between the Agulhas Current and the Agulhas leakage is not well understood. Here, this is investigated using two basin-scale and two global ocean models of incrementally increasing resolution. The response of the Agulhas Current is evaluated under a series of sensitivity experiments, in which idealized anomalies, designed to geometrically modulate zonal trade wind stress, are applied across the Indian Ocean Basin. The imposed wind stress changes exceed plus or minus two standard deviations from the annual-mean trade winds and, in the case of intensification, are partially representative of recently observed trends. The Agulhas leakage is quantified using complimentary techniques based on Lagrangian virtual floats and Eulerian passive tracer flux. As resolution increases, model behavior converges and the sensitivity of the leakage to Agulhas Current transport anomalies is reduced. In the two eddy-resolving configurations tested, the leakage is insensitive to changes in Agulhas Current transport at 32°S, though substantial eddy kinetic energy anomalies are evident. Consistent with observations, the position of the retroflection remains stable. The decoupling of Agulhas Current variability from the Agulhas leakage suggests that while correlations between the two may exist, they may not have a clear dynamical basis. It is suggested that present and future Agulhas leakage proxies should be considered in the context of potentially transient forcing regimes.
机译：关于Agulhas电流与Agulhas泄漏之间的关系，人们还不太了解。在这里，使用分辨率逐步提高的两个盆地规模和两个全球海洋模型对此进行了研究。 Agulhas Current的响应在一系列敏感性实验中得到了评估，其中理想化的异常（旨在几何地调节区域性贸易风应力）被应用到整个印度洋海盆。施加的风应力变化与年平均贸易风相差超过或减去两个标准偏差，并且在加剧的情况下，可以部分代表最近观察到的趋势。 Agulhas泄漏使用基于拉格朗日虚拟浮子和欧拉被动示踪剂通量的互补技术进行量化。随着分辨率的提高，模型行为收敛，泄漏对Agulhas Current传输异常的敏感性降低。在测试的两种涡旋解析配置中，尽管明显涡流动能异常明显，但泄漏对Agulhas电流在32°S下的变化不敏感。与观察结果一致，后退的位置保持稳定。 Agulhas电流变异性与Agulhas泄漏的解耦表明，尽管两者之间可能存在关联，但它们可能没有明确的动力学基础。建议在潜在的瞬态强迫机制的背景下考虑当前和未来的Agulhas泄漏代理。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第7期|1776-1797|共22页
  • 作者

    Benjamin R. Loveday; Jonathan V. Durgadoo; Chris J. C. Reason; Arne Biastoch; Pierrick Penven;

  • 作者单位

    Department of Oceanography, University of Cape Town, Cape Town, South Africa Room 123, RW James Building, Residence Road, University of Cape Town, Cape Town 7700, South Africa;

    GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany;

    Department of Oceanography, University of Cape Town, Cape Town, South Africa;

    GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany;

    LMI ICEMASA, Laboratoire de Physique des Oceans, UMR 6523 (CNRS, IFREMER, IRD, UBO), Brest, France;

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