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On leakage of energy from turbulence to internal waves in the oceanic mixed layer

机译：关于海洋混合层中湍流向内波的能量泄漏

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摘要

In this paper, we address the question of energy leakage from turbulence to internal waves (IWs) in the oceanic mixed layer (OML). If this leakage is substantial, then not only does this have profound implications as far as the dynamics of the OML is concerned, but it also means that the equation for the turbulence kinetic energy (TKE) used in OML models must include an appropriate sink term, and traditional models must be modified accordingly. Through comparison with the experimental data on grid-generated turbulence in a stably stratified fluid, we show that a conventional two-equation turbulence model without any IW sink term can explain these observations quite well, provided that the fluctuating motions that persist long after the decay of grid-generated turbulence are interpreted as being due to IW motions generated by the initial passage of the grid through the stably stratified fluid and not during turbulence decay. We conclude that there is no need to postulate an IW sink term in the TKE equation, and conventional models suffice to model mixing in the OML.
机译：在本文中，我们解决了海洋混合层（OML）中从湍流到内波（IW）的能量泄漏问题。如果泄漏很大，那么就OML的动力学而言，这不仅具有深远的意义，而且还意味着OML模型中使用的湍流动能（TKE）方程必须包含一个适当的吸收项，必须对传统模型进行相应的修改。通过与稳定分层流体中网格产生的湍流的实验数据进行比较，我们表明，没有任何IW下沉项的常规两方程湍流模型可以很好地解释这些观察结果，前提是波动运动在衰减后会持续很长时间网格产生的湍流的变化被解释为是由于网格初始通过稳定的分层流体而不是在湍流衰减过程中通过网格产生的IW运动引起的。我们得出的结论是，无需在TKE方程中假设IW汇项，而常规模型足以在OML中对混合建模。

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