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首页> 外文期刊>Journal of Physical Oceanography >Disintegration of the K_1 Internal Tide in the South China Sea due to Parametric Subharmonic Instability
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Disintegration of the K_1 Internal Tide in the South China Sea due to Parametric Subharmonic Instability

机译：由于参数次级不稳定，南海的K_1内部潮汐解体

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摘要

The disintegration of the equatorward-propagating K-1 internal tide in the South China Sea (SCS) by parametric subharmonic instability (PSI) at its critical latitude of 14.52 degrees N is investigated numerically. The multiple-source generation and long-range propagation of K-1 internal tides are successfully reproduced. Using equilibrium analysis, the internal wave field near the critical latitude is found to experience two quasi-steady states, between which the subharmonic waves develop constantly. The simulated subharmonic waves agree well with classic PSI theoretical prediction. The PSI-induced near-inertial waves are of half the K-1 frequency and dominantly high modes, the vertical scales ranging from 50 to 180 m in the upper ocean. From an energy perspective, PSI mainly occurs in the critical latitudinal zone from 13 degrees to 15 degrees N. In this zone, the incident internal tide loses similar to 14% energy in the mature state of PSI. PSI triggers a mixing elevation of O(10(-5)-10(-4))m(2) s(-1) in the upper ocean at the critical latitude, which is several times larger than the background value. The contribution of PSI to the internal tide energy loss and associated enhanced mixing may differ regionally and is closely dependent on the intensity and duration of background internal tide. The results elucidate the far-field dissipation mechanism by PSI in connecting interior mixing with remotely generated K1 internal tides in the Luzon Strait.
机译：在数值上调查了在14.52℃的关键纬度下通过参数次谐波稳定性（PSI）在南中海（SCS）中赤道传播K-1内部潮汐的崩解。 k-1内部潮汐的多源生成和远程传播成功再现。使用均衡分析，发现关键纬度附近的内波场来体验两个准稳态状态，郊区波浪不断发展。模拟的次谐波与经典PSI理论预测很好。 PSI诱导的近惯性波是k-1频率的一半，垂直鳞片在上海中的50至180米。从能量角度来看，PSI主要发生在关键纬度区从13度到15度N.在该区域中，入射的内部潮汐损失在PSI的成熟状态下类似于14％的能量。 PSI触发了在临界纬度的上海中的O（10（-5）-10（-4））m（2）S（-1）的混合升高，这比背景值大几倍。 PSI对内部潮汐能量损失和相关增强混合的贡献可能会区别不同，并且密切依赖于背景内部潮汐的强度和持续时间。结果通过PSI阐明了PSI在鲁氏海峡中与远程产生的K1内部潮汐连接的内部混合中的远场耗散机制。

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