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The Impact of Subtidal Circulation on Internal-Tide-Induced Mixing in the Philippine Sea

机译:潮汐环流对菲律宾海内潮引起的混合的影响

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摘要

This study uses a primitive equation model to estimate the time-varying M_2 internal tide dissipation in the Philippine Sea in the presence of the subtidal circulation. The time-mean diapycnal diffusivity due to the M_2 internal tide is estimated to be 4.0-4.8 × 10~(-4)m~2s~(-2) at the Luzon Strait and 2-9 × 10~(-5)m~2s~(-1) in the Philippine Sea basin. The variability in internal tides and their interactions with the subtidal ocean circulation results in significant spatial and temporal variability in the energy available for mixing. The subtidal circulation influences internal-tide-induced mixing in two ways: by introducing variability in internal tide generation and by increased dissipation of baroclinic energy associated with greater velocity shear. Close to the generation site, mixing is dominated by high-mode internal tide dissipation, while in the far field the influence of the mesoscale energy on internal tide dissipation is significant, resulting in increased dissipation. This study presents model-based estimates of the important and relatively unknown effect of mesoscale circulation on internal-tide-induced mixing away from internal tide generation sites in a region of high eddy kinetic energy.
机译:这项研究使用原始方程模型来估算存在潮汐环流的菲律宾海中随时间变化的M_2内部潮汐消散。在吕宋海峡,由于M_2内部潮汐引起的时间平均径流扩散率估计为4.0-4.8×10〜(-4)m〜2s〜(-2),2-9×10〜(-5)m在菲律宾海盆〜2s〜(-1)。内部潮汐的变化及其与潮下海洋环流的相互作用导致可用于混合的能量在空间和时间上具有明显的变化。潮下带循环以两种方式影响内部潮汐引起的混合:通过在内部潮汐产生中引入可变性以及通过与更大的速度剪切有关的斜压能量的增加的耗散。在发电地点附近,混合以高模内部潮汐耗散为主导,而在远场中,中尺度能量对内部潮汐耗散的影响很大,导致耗散增加。这项研究提出了基于模型的中尺度环流对高涡动能区域内潮汐产生地点内潮引起的混合作用的重要且相对未知的影响的估计。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第12期|3209-3224|共16页
  • 作者单位

    University of Hawai'i at Manoa, Honolulu, Hawaii,University of Hawai'i at Manoa, 1000 Pope Rd., Honolulu, HI 96822;

    University of Hawai'i at Manoa, Honolulu, Hawaii;

    University of Hawai'i at Manoa, Honolulu, Hawaii;

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