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首页> 外文期刊>Journal of Physical Oceanography >A New Model of Current Retroflection Applied to the Westward Protrusion of the Agulhas Current
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A New Model of Current Retroflection Applied to the Westward Protrusion of the Agulhas Current

机译：一种新的电流反演模型应用于Agulhas流向西突出

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摘要

The dynamics of current retroflection and rings shedding are not yet fully understood. In this paper, the authors develop an analytical model of the Agulhas Current retroflection dynamics using three simple laws: conservation of volume, momentum balance, and Bernoulli's principle. This study shows that, for a retroflecting current with a small Rossby number, this theoretical model is in good agreement with numerical simulations of a reduced-gravity isopycnal model. Otherwise, the retroflection position becomes unstable and quickly propagates upstream, leaving a chain of eddies in its path. On the basis of these findings, the authors hypothesize that the westward protrusion of the Agulhas retroflection and the local "zonalization" of the Agulhas Current after it passes the Agulhas Bank are stable only for small Rossby numbers. Otherwise, the retroflection shifts toward the eastern slope of the Agulhas Bank, where its position stabilizes due to the slanted configuration of the slope. This study shows that this scenario is in good agreement with several high-resolution numerical models.
机译：当前逆向反射和环脱落的动力学尚未完全了解。在本文中，作者使用三个简单定律开发了Agulhas Current逆向动力学的分析模型：体积守恒，动量平衡和Bernoulli原理。这项研究表明，对于具有小Rossby数的逆流电流，该理论模型与重力减小的等渗模型的数值模拟非常吻合。否则，后退位置将变得不稳定，并迅速向上游传播，从而在其路径中留下涡流链。基于这些发现，作者假设Agulhas逆行的向西突出和经过Agulhas Bank之后的Agulhas Current的局部“区域化”仅对于较小的Rossby数是稳定的。否则，后退将转向Agulhas银行的东坡，由于坡的倾斜构造，其位置稳定。这项研究表明，这种情况与几个高分辨率数值模型非常吻合。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第12期|3118-3138|共21页
  • 作者

    Wilton Arruda; Volodymyr Zharkov; Bruno Deremble; Doron Nof; Eric Chassignet;

  • 作者单位

    Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida, and Instituto de Matematica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil;

    Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, Florida;

    Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida;

    Department of Earth, Ocean and Atmospheric Science, and Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, Florida Department of Earth, Ocean and Atmospheric Science, 419, 117 N. Woodward Ave., Florida State University, Tallahassee, FL 32306;

    Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, Florida;

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