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Eikonal Calculations for Energy Transfer in the Deep-Ocean Internal Wave Field near Mixing Hotspots

机译：混合热点附近深海内波场能量传递的精确计算

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摘要

In the proximity of mixing hotspots in the deep ocean, the observed internal wave spectra are usually distorted from the Garrett-Munk (GM) spectrum and are characterized by the high energy level E as well as a shear-strain ratio R-omega quite different from that of the GM spectrum. On the basis of the eikonal theoretical model, Ijichi and Hibiya (IH) recently proposed the revised finescale parameterization of turbulent dissipation rates in the distorted internal wave field, although the vertical velocity associated with background internal waves and the strict WKB scale separation, for example, were not taken into account. To see the effects of such simplifying assumptions on the revised parameterization, this study carries out a series of eikonal calculations for energy transfer through various internal wave spectra distorted from the GM. Although the background vertical velocity and the strict WKB scale separation somewhat affect the calculated energy transfer rates, their parameter dependence is confirmed as expected; the calculated energy transfer rates epsilon follow the basic scaling epsilon proportional to E-2 N-2 f with the local buoyancy frequency N and the local inertial frequency f and exhibit strong R-omega dependence quite similar to that predicted by IH.
机译：在深海混合热点附近，观测到的内部波谱通常会从Garrett-Munk（GM）谱中失真，其特征是高能级E以及剪切应变比R-omega完全不同从转基因光谱。 Ijichi和Hibiya（IH）在标准理论模型的基础上，最近提出了修正的内部波场中湍流耗散率的精细尺度参数化，尽管垂直速度与背景内部波和严格的WKB尺度分离相关，例如，未考虑在内。为了了解简化假设对修改后的参数化的影响，本研究对通过GM变形的各种内部波谱进行了一系列有效的能量传递计算。尽管背景垂直速度和严格的WKB标尺分离在一定程度上影响了计算出的能量传递速率，但可以确定它们的参数依赖性；计算出的能量传递速率ε遵循与E-2 N-2 f成正比的基本比例ε，并具有局部浮力频率N和局部惯性频率f，并且表现出与IH预测的相近的强R-ω依赖性。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第1期|199-210|共12页
  • 作者

    Ijichi Takashi; Hibiya Toshiyuki;

  • 作者单位

    Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan;

    Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan;

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  • 正文语种 eng
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