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首页> 外文期刊>Journal of Physical Oceanography >Enhanced Diapycnal Mixing due to Near-Inertial Internal Waves Propagating through an Anticyclonic Eddy in the Ice-Free Chukchi Plateau
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Enhanced Diapycnal Mixing due to Near-Inertial Internal Waves Propagating through an Anticyclonic Eddy in the Ice-Free Chukchi Plateau

机译：在无冰的楚科奇高原，由于近惯性内波通过反旋风涡传播，增强了对向混合。

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The Arctic Ocean is known to be quiescent in terms of turbulent kinetic energy (TKE) associated with internal waves. To investigate the current state of TKE in the seasonally ice-free Chukchi Plateau, Arctic Ocean, this study performed a 3-week, fixed-point observation (FPO) using repeated microstructure, hydrographic, and current measurements in September 2014. During the FPO program, the microstructure observation detected noticeable peaks of TKE dissipation rate epsilon during the transect of an anticyclonic eddy moving across the FPO station. Particularly, epsilon had a significant elevation in the lower halocline layer, near the critical level, reaching the order of 10 28 Wkg 21. The ADCP-measured current displayed energetic near-inertial internal waves (NIWs) propagating via the stratification at the top and bottom of the anticyclone. According to spectral analyses of horizontal velocity, the waves had almost downward energy propagation, and its current amplitude reached similar to 10 cm s(-1). The WKB scaling, incorporating vertical variations of relative vorticity, suggests that increased wave energy near the two pycnoclines was associated with diminishing group velocity at the corresponding depths. The finescale parameterization using observed near-inertial velocity and buoyancy frequency successfully reproduced the characteristics of observed epsilon, supporting that the near-inertial kinetic energy can be effectively dissipated into turbulence near the critical layer. According to a mixed layer slab model, a rapidly moving storm that has passed over in the first week likely delivered the bulk of NIW kinetic energy, eventually captured by the vortex, into the surface water.
机译：就与内波有关的湍动能（TKE）而言，北冰洋是静止的。为调查北冰洋地区季节性无冰楚科奇高原地区TKE的当前状态，该研究于2014年9月进行了为期3周的定点观测（FPO），使用了重复的微观结构，水文和电流测量结果。在程序中，微观结构观察发现在FPO台站上横穿反气旋涡的过程中，TKE耗散率ε出现了明显的峰值。特别地，ε在较低的卤代烃层中达到临界水平时显着升高，达到10 28 Wkg 21的量级。ADCP测量的电流显示出高能近惯性内波（NIW），它们通过顶部和底部的分层传播。反气旋的底部。根据水平速度的频谱分析，这些波几乎具有向下的能量传播，并且其电流幅度达到了大约10 cm s（-1）。 WKB标度结合了相对涡度的垂直变化，表明在两个测斜线附近增加的波能与相应深度处的群速度减小有关。利用观测到的近惯性速度和浮力频率进行的精细参数化成功地再现了观测到的ε的特征，支持近惯性动能可以有效地消散到临界层附近的湍流中。根据混合层平板模型，在第一周过去的快速移动的风暴可能会将大量NIW动能传递到地表水中，最终NIW动能最终被涡旋捕获。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第8期|2457-2481|共25页
  • 作者

    Kawaguchi Yusuke; Nishino Shigeto; Inoue Jun; Maeno Katsuhisa; Takeda Hiroki; Oshima Kazuhiro;

  • 作者单位

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan|Japan Agcy Marine Earth Sci & Technol, Inst Arctic Climate & Environm Res, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan|Natl Inst Polar Res, Tokyo, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan|Global Ocean Dev Inc, Yokohama, Kanagawa, Japan|Nippon Marine Enterprises Ltd, Yokosuka, Kanagawa, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan|Tokyo Gakugei Univ, Tokyo, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan;

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