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首页> 外文期刊>Journal of Physical Oceanography >Variability and Coherence of the Agulhas Undercurrent in a High-Resolution Ocean General Circulation Model
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Variability and Coherence of the Agulhas Undercurrent in a High-Resolution Ocean General Circulation Model

机译：高分辨率海洋总环流模型中Agulhas暗流的变异性和相干性

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摘要

The Agulhas Current system has been analyzed in a nested high-resolution ocean model and compared to observations. The model shows good performance in the western boundary current structure and the transports off the South African coast. This includes the simulation of the northward-flowing Agulhas Undercurrent. It is demonstrated that fluctuations of the Agulhas Current and Undercurrent around 50-70 days are due to Natal pulses and Mozambique eddies propagating downstream. A sensitivity experiment that excludes those upstream perturbations significantly reduces the variability as well as the mean transport of the undercurrent. Although the model simulates undercurrents in the Mozambique Channel and east of Madagascar, there is no direct connection between those and the Agulhas Undercurrent. Virtual float releases demonstrate that topography is effectively blocking the flow toward the north.
机译：已在嵌套的高分辨率海洋模型中对Agulhas Current系统进行了分析，并与观测值进行了比较。该模型在西部边界流结构和南非海岸外的输运中显示出良好的性能。这包括对北向流动的Agulhas暗流的模拟。事实证明，Agulhas洋流和暗流在50-70天左右的波动是由于纳塔尔脉动和莫桑比克涡流向下游传播所致。排除那些上游扰动的灵敏度实验可以显着降低波动性以及暗流的平均传输。尽管该模型模拟了莫桑比克海峡和马达加斯加东部的暗流，但是这些与阿古拉斯暗流之间没有直接联系。虚拟浮标释放表明地形有效地阻止了向北的水流。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第10期|2417-2435|共19页
  • 作者

    A. Biastoch; L. M. Beal; J. R. E. Lutjeharms; T. G. D. Casal;

  • 作者单位

    Leibniz-Institut fuer Meereswissenschaften (IFM-GEOMAR), Duesternbrooker Weg 20, 24105 Kiel, Germany;

    Rosenstiel School of Marine and Atmospheric Science, Miami, Florida;

    University of Cape Town, Rondebosch, South Africa;

    Rosenstiel School of Marine and Atmospheric Science, Miami, Florida;

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