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首页> 外文期刊>Journal of Physical Oceanography >The Life Cycle of Spontaneously Generated Internal Waves
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The Life Cycle of Spontaneously Generated Internal Waves

机译：自发内波的生命周期

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Recent numerical modeling studies have suggested significant spontaneous internal wave generation near the ocean surface and energy transfers to and from these waves in the ocean interior. Spontaneous generation is the emission of waves by unbalanced, large Rossby number flows in the absence of direct forcing. Here, the authors' previous work is extended to investigate where and how these waves exchange energy with the nonwave (mean) flow. A novel double-filtering technique is adopted to separate first the wave and nonwave fields, then the individual upward- and downward-propagating wave fields, and thereby identify the pathways of energy transfer. These energy transfers are dominated by the interaction of the waves with the vertical shear in the mean flow. Spontaneously generated waves are found to be oriented such that the downward-propagating wave is amplified by the mean shear. The internal waves propagate through the entire model depth while dissipating energy and reflect back upward. The now-upward-propagating waves have the opposite sign interaction with the mean shear and decay, losing most of their energy to the nonwave flow in the upper 500 m. Overall, in the simulations described here, approximately 30% of the wave energy is dissipated, and 70% is returned to the mean flow. The apparent preferential orientation of spontaneous generation suggests a potentially unique role for these waves in the ocean energy budget in uniformly drawing net energy from mean flow in the upper-ocean interior and transporting it to depth.
机译：最近的数值模拟研究表明，在海洋表面附近会产生大量自发的内部波，并且在海洋内部这些波之间来回传递能量。自发产生是在没有直接强迫的情况下，由不平衡的，较大的罗斯比数流产生的波发射。在这里，作者的先前工作得以扩展，以研究这些波在何处以及如何与非波（平均）流交换能量。采用一种新颖的双重滤波技术，首先将波场和非波场分开，然后将各个向上和向下传播的波场分开，从而确定能量转移的路径。这些能量传递受波浪与平均流中垂直剪切力相互作用的支配。发现自发产生的波被定向成使得向下传播的波被平均剪切放大。内部波传播整个模型深度，同时耗散能量并向上反射回去。现在向上传播的波与平均剪切和衰变具有相反的符号相互作用，从而将大部分能量损失给上部500 m的非波流。总体而言，在此处描述的模拟中，大约耗散了30％的波能，而70％的波返回到平均流量。自发发电的明显优先取向表明，这些波浪在海洋能量收支中的潜在独特作用是，从上层海洋内部的平均流量中均匀地吸收净能量并将其传输到深度。

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