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Observed Energy Exchange between Low-Frequency Flows and Internal Waves in the Gulf of Mexico

机译：观察到的墨西哥湾低频流与内波之间的能量交换

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摘要

A long-term mooring array deployed in the northern Gulf of Mexico is used to analyze energy exchange between internal waves and low-frequency flows. In the subthermocline (245-450 m), there is a noticeable net energy transfer from low-frequency flows, defined as having a period longer than six inertial periods, to internal waves. The magnitude of energy transfer rate depends on the Okubo-Weiss parameter of low-frequency flows. A permanent energy exchange occurs only when the Okubo-Weiss parameter is positive. The near-inertial internal waves (NIWs) make major contribution to the energy exchange owing to their energetic wave stress and relatively stronger interaction with low-frequency flows compared to the high-frequency internal waves. There is some evidence that the permanent energy exchange between low-frequency flows and NIWs is attributed to the partial realization of the wave capture mechanism. In the periods favoring the occurrence of the wave capture mechanism, the horizontal propagation direction of NIWs becomes anisotropic and exhibits evident tendency toward that predicted from the wave capture mechanism, leading to pronounced energy transfer from low-frequency flows to NIWs.
机译：在墨西哥湾北部部署的长期系泊设备用于分析内部波和低频流之间的能量交换。在亚高温线（245-450 m）中，有明显的净能量从低频流（定义为周期长于六个惯性周期）转移到内部波。能量传递速率的大小取决于低频流的Okubo-Weiss参数。仅当Okubo-Weiss参数为正时，才会发生永久性能量交换。与高频率内部波相比，近惯性内部波（NIW）由于其高能波应力和与低频流的相对较强的相互作用而对能量交换做出了重要贡献。有证据表明，低频流与NIW之间的永久能量交换归因于电波捕获机制的部分实现。在有利于波浪捕获机制发生的时期，NIW的水平传播方向变得各向异性，并呈现出从波浪捕获机制预测的趋势，并且有明显的趋势，导致从低频流向NIW的明显能量转移。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第4期|995-1008|共14页
  • 作者

    Jing Zhao; Chang Ping; DiMarco S. F.; Wu Lixin;

  • 作者单位

    Ocean Univ China, Minist Educ, Key Lab Phys Oceanog, Qingdao, Peoples R China;

    Ocean Univ China, Minist Educ, Key Lab Phys Oceanog, Qingdao, Peoples R China;

    Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA;

    Ocean Univ China, Minist Educ, Key Lab Phys Oceanog, Qingdao, Peoples R China;

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