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首页> 外文期刊>Journal of Physical Oceanography >Reevaluating the Roles of Eddies in Multiple Barotropic Wind-Driven Gyres
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Reevaluating the Roles of Eddies in Multiple Barotropic Wind-Driven Gyres

机译：重新评估涡流在多个正压风动涡旋中的作用

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摘要

Multiple-gyre ocean models have a weaker mean subtropical circulation than single-gyre calculations with the same viscosity and subtropical forcing. Traditionally, this reduction in circulation is attributed to an intergyre eddy vorticity flux that cancels some of the wind input, part of which does not require a Lagrangian mass exchange (theory of dissipative meandering). Herein the intergyre eddy vorticity flux is shown to be a controlling factor in barotropic models at high Reynolds number only with exactly antisymmetric gyres and slip boundary conditions. Almost no intergyre flux occurs when no-slip boundary conditions are used, yet the subtropical gyre is still significantly weaker in multiple-gyre calculations. Sinuous modes of instability present only in multiple gyres are shown here to vastly increase the eddy vorticity transport efficiency. This increase in efficiency reduces the mean circulation necessary for equilibrium. With slip boundary conditions, the intergyre eddy transport is possibly much larger. However, with wind forcing relevant for the ocean—two unequal gyres—a mean flow flux of vorticity rather than an eddy flux between the regions of opposing wind forcing is increasingly important with increasing Reynolds number. A physical rationalization of the differing results is provided by diagnosis of the equilibrium vorticity budget and eddy transport efficiency. Calculations varying 1) boundary conditions, 2) sources and sinks of vorticity, 3) eddy transport efficiency, and 4) the degree of symmetry of the gyres are discussed.
机译：与具有相同粘度和副热带强迫的单回旋计算相比，多回旋海洋模型的平均亚热带环流较弱。传统上，这种循环的减少归因于旋涡涡流消除了一些风输入，其中一部分不需要拉格朗日质量交换（耗散曲折理论）。在本文中，仅在精确地存在反对称旋涡和滑移边界条件的情况下，在高雷诺数的正压模型中，旋涡间涡流被显示为控制因素。当使用无滑移边界条件时，几乎没有旋回通量发生，但是在多旋回计算中，亚热带旋回仍然明显较弱。此处显示仅在多个回旋中存在的不稳定性的弯曲模式极大地提高了涡旋涡的传输效率。效率的提高减少了平衡所需的平均循环。在滑移边界条件下，旋涡的涡流传输可能会更大。但是，随着与海洋相关的强迫风（两个不相等的回旋角），随着雷诺数的增加，相对于强迫风的区域之间的平均涡流而不是涡流变得越来越重要。通过平衡涡度预算和涡流传输效率的诊断，可以对不同结果进行物理合理化。讨论了以下计算的变化：1）边界条件，2）涡旋的源和汇，3）涡流传输效率和4）回转的对称度。

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  • 来源
    《Journal of Physical Oceanography》 |2005年第7期|p.1263-1278|共16页
  • 作者

    BAYLOR FOX-KEMPER;

  • 作者单位

    Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 01239;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
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