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A New Look at Richardson Number Mixing Schemes for Equatorial Ocean Modeling

机译：赤道海洋建模的理查森数混合方案的新发现

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摘要

A reexamination of turbulence dissipation measurements from the equatorial Pacific shows that the turbulence diffusivities are not a simple function of the gradient Richardson number. A widely used mixing scheme, the K-profile parameterization, overpredicts the turbulent vertical heat flux by roughly a factor of 4 in the stably stratified region between the surface mixed layer and the Equatorial Undercurrent (EUC). Additionally, the heat flux divergence is of the incorrect sign in the upper 80 m. An alternative class of pa-rameterizations is examined that expresses the mixing coefficients in terms of the large-scale kinetic energy, shear, and Richardson number. These representations collapse the turbulence diffusivities above and below the Equatorial Undercurrent, and a tuned version is able to reproduce the vertical turbulence heat flux within the 50-180-m depth range. Kinetic energy is not Galilean invariant, so the collapse of the data with the new parameterization suggests that oceanic turbulence responds to boundary forcing at depths well below the surface mixed layer.
机译：对赤道太平洋湍流耗散测量的重新检验表明，湍流扩散率不是理查森梯度梯度的简单函数。广泛使用的混合方案，即K轮廓参数化，在表面混合层和赤道暗流（EUC）之间的稳定分层区域中，将湍流垂直热通量高估了大约4倍。此外，热通量发散在高80 m处是不正确的符号。研究了另一类参数化，它以大规模动能，剪切力和理查森数表示混合系数。这些表示使赤道暗流上方和下方的湍流扩散率崩溃，经过调整的版本能够再现深度在50-180-m范围内的垂直湍流热通量。动能不是伽利略不变的，因此新参数化对数据的破坏表明，海洋湍流对远低于表面混合层的深度的边界强迫做出了响应。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第10期|2652-2664|共13页
  • 作者

    Edward D. Zaron; James N. Moum;

  • 作者单位

    Dept. of Civil and Environmental Engineering, Portland State University, P.O. Box 751, Portland, OR 97207-0751;

    College of Oceanic and Atmospheric Science, Oregon State University, Corvallis, Oregon;

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