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首页> 外文期刊>Journal of Physical Oceanography >Subharmonic Energy Transfer from the Semidiurnal Internal Tide to Near-Diurnal Motions over Kaena Ridge, Hawaii
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Subharmonic Energy Transfer from the Semidiurnal Internal Tide to Near-Diurnal Motions over Kaena Ridge, Hawaii

机译：次谐波能量从半日内潮向夏威夷Kaena Ridge的近日运动转移

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摘要

Nonlinear energy transfers from the semidiurnal internal tide to high-mode, near-diurnal motions are documented near Kaena Ridge, Hawaii, an energetic generation site for the baroclinic tide. Data were collected aboard the Research Floating Instrument Platform (FLIP) over a 35-day period during the fall of 2002, as part of the Hawaii Ocean Mixing Experiment (HOME) Nearfield program. Energy transfer terms for a PSI resonant interaction at midlatitude are identified and compared to those for near-inertial PSI close to the M_2 critical latitude. Bispectral techniques are used to demonstrate significant energy transfers in the Nearfield, between the low-mode M_2 internal tide and subharmonic waves with frequencies near M_2/2 and vertical wavelengths of 0(120 m). A novel prefilter is used to test the PSI wavenumber resonance condition, which requires the subharmonic waves to propagate in opposite vertical directions. Depth-time maps of the interactions, formed by directly estimating the energy transfer terms, show that energy is transferred predominantly from the tide to subharmonic waves, but numerous reverse energy transfers are also found. A net forward energy transfer rate of 2 × 10~(-9) W kg~(-1) is found below 400 m. The suggestion is that the HOME observations of energy transfer from the tide to subharmonic waves represent a first step in the open-ocean energy cascade. Observed PSI transfer rates could account for a small but significant fraction of the turbulent dissipation of the tide within 60 km of Kaena Ridge. Further extrapolation suggests that integrated PSI energy transfers equatorward of the M_2 critical latitude may be comparable to PSI energy transfers previously observed near 28.8°N.
机译：从半日潮内部潮汐到高模近日运动的非线性能量转移已记录在夏威夷Kaena Ridge附近，这是斜压潮的高产地。作为夏威夷海洋混合实验（HOME）近场程序的一部分，在2002年秋季的35天时间内，使用研究浮动仪器平台（FLIP）收集了数据。确定了中纬度PSI共振相互作用的能量传递项，并将其与接近M_2临界纬度的近惯性PSI的能量传递项进行了比较。双谱技术被用来证明近场在低模M_2内潮和次谐波之间的大量能量传递，次谐波的频率接近M_2 / 2，垂直波长为0（120 m）。一种新颖的预滤波器用于测试PSI波数共振条件，该条件要求亚谐波在垂直方向上传播。通过直接估计能量传递项形成的相互作用的深度图显示，能量主要从潮汐传递到次谐波，但也发现了许多反向能量传递。在400 m以下发现净正向能量传递率为2×10〜（-9）W kg〜（-1）。建议是，HOME观测从潮汐到次谐波的能量转移代表了开放海洋能量级联的第一步。观测到的PSI传输速率可能占Kaena Ridge 60 km内潮汐湍流消散的一小部分，但占很大比例。进一步的推断表明，在M_2临界纬度的赤道方向积分的PSI能量转移可能与之前在28.8°N附近观察到的PSI能量转移相当。

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    《Journal of Physical Oceanography》 |2013年第4期|766-789|共24页
  • 作者

    Oliver M. Sun; Robert Pinkel;

  • 作者单位

    Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California Oliver M. Sun, Woods Hole Oceanographic Institution, M.S. #21 Woods Hole, MA 02543;

    Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California;

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