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首页> 外文期刊>Journal of Physical Oceanography >Volume and Potential Vorticity Budgets of Eighteen Degree Water
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Volume and Potential Vorticity Budgets of Eighteen Degree Water

机译：十八度水的体积和潜在涡度预算

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摘要

Mode waters are a distinctive baroclinic feature of the World Ocean characterized by relatively weak vertical stratification. They correspond dynamically to low potential vorticity (PV). In the North Atlantic subtropical gyre, the mode waters have become known as Eighteen Degree Water. Their dynamics involves air-sea interaction, diapycnal and isopycnal mixing, and subduction. Understanding mode water dynamics is therefore both challenging and important since it connects several aspects of the ocean circulation. Mass and PV budget of the mode water's core, evaluated in a realistic primitive equation North Atlantic model, are used to characterize mode water maintenance. It is shown that the surface PV flux has very little impact on mode water; the surface buoyancy flux in combination with eddy mass flux is the most important control on mode water structure. A mean PV formalism is used to show that the PV and water-mass formation budgets are intrinsically linked. A decomposition of the budget demonstrates the role of the mean PV field in permitting the eddy mass flux to discharge the net formation to the surrounding fluid.
机译：模式水是世界海洋的一个独特的斜压特征，其垂直分层相对较弱。它们动态对应于低电位涡度（PV）。在北大西洋亚热带环流中，模式水已被称为十八度水。它们的动力学涉及海-气相互作用，二面体和二面体混合以及俯冲。因此，了解模式水动力学既具有挑战性也很重要，因为它联系了海洋环流的多个方面。在实际的原始方程式北大西洋模型中评估的模式水核心的质量和PV预算用于表征模式水维护。结果表明，表面光伏通量对模式水的影响很小。表面浮力通量与涡流质量通量相结合是模式水结构最重要的控制方法。均值PV形式主义用来表明PV和水质形成预算是内在联系的。预算的分解证明了平均PV场在允许涡流通量将净地层排放到周围流体中的作用。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第11期|2309-2321|共13页
  • 作者

    Bruno Deremble; W. K. Dewar;

  • 作者单位

    Department of Earth, Ocean and Atmospheric Science, The Florida State University, Tallahassee, Florida,The Florida State University, 117 N. Woodward Ave., Tallahassee, FL 32306- 4320;

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

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