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首页> 外文期刊>Journal of Physical Oceanography >Eddy-Driven Buoyancy Gradients on Eastern Boundaries and Their Role in the Thermocline
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Eddy-Driven Buoyancy Gradients on Eastern Boundaries and Their Role in the Thermocline

机译：涡流在东部边界上的浮力梯度及其在温跃层中的作用

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摘要

It is demonstrated that eddy fluxes of buoyancy at the eastern and western boundaries maintain alongshore buoyancy gradients along the coast. Eddy fluxes arise near the eastern and western boundaries because on both coasts buoyancy gradients normal to the boundary are strong. The eddy fluxes are accompanied by mean vertical flows that take place in narrow boundary layers next to the coast where the geostrophic constraint is broken. These ageostrophic cells have a velocity component normal to the coast that balances the geostrophic mean velocity. It is shown that the dynamics in these thin ageostrophic boundary layers can be replaced by effective boundary conditions for the interior flow, relating the eddy flux of buoyancy at the seaward edge of the boundary layers to the buoyancy gradient along the coast. These effective boundary conditions are applied to a model of the thermocline linearized around a mean stratification and a state of rest. The linear model parameterizes the eddy fluxes of buoyancy as isopycnal diffusion. The linear model produces horizontal gradients of buoyancy along the eastern coast on a vertical scale that depends on both the vertical diffusivity and the eddy diffusivity. The buoyancy field of the linear model agrees very well with the mean state of an eddy-resolving computation. Because the east-west difference in buoyancy is related to the zonally integrated meridional velocity, the linear model successfully predicts the meridional overturning circulation.
机译：结果表明，东部和西部边界的浮力涡流在沿海地区保持了沿岸的浮力梯度。涡流在东西边界附近产生，因为在这两个海岸上垂直于边界的浮力梯度都很大。涡流伴随着平均垂直流，平均垂直流发生在地转约束被打破的海岸附近的狭窄边界层中。这些变营养细胞具有垂直于海岸的速度分量，该速度分量平衡了地转平均速度。结果表明，这些薄变质边界层中的动力学可以被内部流的有效边界条件所代替，从而使边界层向海边缘的浮力涡流与沿海岸的浮力梯度相关。将这些有效边界条件应用于围绕平均分层和静止状态线性化的温跃层模型。线性模型将浮力的涡流参数化为等渗扩散。线性模型在垂直尺度上沿东海岸产生浮力的水平梯度，该梯度取决于垂直扩散率和涡流扩散率。线性模型的浮力场与涡旋解析计算的平均状态非常吻合。由于浮力的东西方向差异与纬向积分的纬向速度有关，因此线性模型成功地预测了纬向翻转环流。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第7期|1595-1614|共20页
  • 作者

    Paola Cessi; Christopher L. Wolfe;

  • 作者单位

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 9500 Gilman Drive, UCSD-0213, La Jolla, CA 92093-0213;

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 9500 Gilman Drive, UCSD-0213, La Jolla, CA 92093-0213;

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