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首页> 外文期刊>Journal of Physical Oceanography >Large-Amplitude Internal Solitary Waves Observed in the Northern South China Sea: Properties and Energetics
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Large-Amplitude Internal Solitary Waves Observed in the Northern South China Sea: Properties and Energetics

机译：南海北部观测到的大振幅内孤立波：性质和能量学

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摘要

Five large-amplitude internal solitary waves (ISWs) propagating westward on the upper continental slope in the northern South China Sea were observed in May-June 2011 with nearly full-depth measurements of velocity, temperature, salinity, and density. As they shoaled, at least three waves reached the convective breaking limit: along-wave current velocity exceeded the wave propagation speed C. Vertical overturns of ～100 m were observed within the wave cores; estimated turbulent kinetic energy was up to 1.5 × 10~(-4) W kg~(-1). In the cores and at the pycnocline, the gradient Richardson number was mostly ＜0.25. The maximum ISW vertical displacement was 173 m, 38% of the water depth. The normalized maximum vertical displacement was ～0.4 for three convective breaking ISWs, in agreement with laboratory results for shoaling ISWs. Observed ISWs had greater available potential energy (APE) than kinetic energy (KE). For one of the largest observed ISWs, the total wave energy per unit meter along the wave crest E was 553 MJ m~(-1) more than three orders of magnitude greater than that observed on the Oregon Shelf. Pressure work contributed 77% and advection contributed 23 % of the energy flux. The energy flux nearly equaled CE. The Dubriel-Jacotin-Long model with and without a background shear predicts neither the observed APE ＞ KE nor the subsurface maximum of the along-wave velocity for shoaling ISWs, but does simulate the total energy and the wave shape. Including the background shear in the model results in the formation of a surface trapped core.
机译：2011年5月至6月，在南海北部的上陆斜坡上向西传播了五个向西传播的大振幅内孤立波，它们对速度，温度，盐度和密度进行了近乎全深度的测量。当他们暗流时，至少有3个波达到对流破裂极限：沿波电流速度超过了波传播速度C。在波芯内观测到约100 m的垂直翻转；估计湍流动能高达1.5×10〜（-4）W kg〜（-1）。在岩心和比诺可格林，理查森数梯度大多＜0.25。 ISW的最大垂直位移为173 m，为水深的38％​​。三个对流破裂ISW的归一化最大垂直位移约为0.4，与暗沙ISW的实验室结果一致。观察到的ISW比动能（KE）具有更大的可用势能（APE）。对于观测到的最大ISW之一，沿波峰E的每米总波能为553 MJ m〜（-1），比在俄勒冈架上观测到的大3个数量级。压力功贡献了77％的能量通量，而平流贡献了23％的能量通量。能量通量几乎等于CE。带有和不带有背景剪切的Dubriel-Jacotin-Long模型既不能预测观测到的APE＞ KE，也不能预测暗沙ISW的沿波速度的地下最大值，但它确实模拟了总能量和波形。在模型中包括背景切变会导致表面陷获核心的形成。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第4期|1095-1115|共21页
  • 作者

    Ren-Chieh Lien; Frank Henyey; Barry Ma; Yiing Jang Yang;

  • 作者单位

    Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105;

    Applied Physics Laboratory, University of Washington, Seattle, Washington;

    Applied Physics Laboratory, University of Washington, Seattle, Washington;

    Department of Marine Science, Naval Academy, Kaohsiung, Taiwan;

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