Surface reflection of bottom generated oceanic lee waves

Surface reflection of bottom generated oceanic lee waves
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底部产生的海洋背风波的表面反射

DOI:
10.1017/jfm.2021.627
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发表时间:
2021
影响因子:
3.7
通讯作者:
Baker L
Baker L
中科院分区:
工程技术2区
文献类型:
--
作者:
Baker L

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由海洋中粗糙海底地形上的分层流产生的背风波从地转流中提取动量和能量,当它们破裂时,在内部海洋中引起阻力并增强湍流和混合。无粘线性理论通常用于预测背风波的产生率,但导致最终能量耗散和不可逆混合的波破碎的位置和机制约束不足。在这项研究中,一个线性模型的粘性,扩散率和上边界被用来证明潜在的重要性的表面反射到内部的背风波能量,使情况下作为一个完整的水柱过程治疗背风波。在临界水平的情况下,它表明,背风波可以预期与上层海洋相互作用,导致在表面附近的增强的垂直速度和耗散和混合。增加背景速度和分层与底部以上的高度的典型海洋条件的影响进行了研究,并显示有助于提高上层海洋垂直速度和混合。
Lee waves generated by stratified flow over rough bottom topography in the ocean extract momentum and energy from the geostrophic flow, causing drag and enhancing turbulence and mixing in the interior ocean when they break. Inviscid linear theory is generally used to predict the generation rate of lee waves, but the location and mechanism of wave breaking leading to eventual dissipation of energy and irreversible mixing are poorly constrained. In this study, a linear model with viscosity, diffusivity and an upper boundary is used to demonstrate the potential importance of the surface in reflecting lee wave energy back into the interior, making the case for treating lee waves as a full water-column process. In the absence of critical levels, it is shown that lee waves can be expected to interact with the upper ocean, resulting in enhanced vertical velocities and dissipation and mixing near the surface. The impact of the typical oceanic conditions of increasing background velocity and stratification with height above bottom are investigated and shown to contribute to enhanced upper ocean vertical velocities and mixing.
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影响因子: 3.5
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