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首页> 外文期刊>Journal of Physical Oceanography >Isopycnal Eddy Diffusivities and Critical Layers in the Kuroshio Extension from an Eddying Ocean Model
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Isopycnal Eddy Diffusivities and Critical Layers in the Kuroshio Extension from an Eddying Ocean Model

机译：涡旋海洋模型对黑潮延展的等渗涡度扩散和临界层

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摘要

High spatial resolution isopycnal diffusivities are estimated in the Kuroshio Extension (KE) region (28°-40°N, 120°-190°E) from a global 1/10° Parallel Ocean Program (POP) simulation. The numerical float tracks are binned using a clustering approach. The number of tracks in each bin is thus roughly the same leading to diffusivity estimates that converge better than those in bins defined by a regular geographic grid. Cross-stream diffusivities are elevated in the southern recirculation gyre region, near topographic obstacles and downstream in the KE jet, where the flow has weakened. Along-stream diffusivities, which are much larger than cross-stream diffusivities, correlate well with the magnitudes of eddy velocity. The KE jet suppresses cross-stream mixing only in some longitude ranges. This study estimates the critical layer depth both from linear local baroclinic instability analysis and from eddy phase speeds in the POP model using the Radon transform. The latter is a better predictor of large mixing length in the cross-stream direction. Critical layer theory is most applicable in the intense jet regions away from topography.
机译：根据全球1/10°平行海洋计划（POP）模拟，估计了黑潮扩展（KE）区域（28°-40°N，120°-190°E）的高空间分辨率等密度扩散。使用浮点法对数字浮动轨迹进行分箱。因此，每个仓中的轨道数量大致相同，从而导致扩散率估计的收敛性好于常规地理网格定义的仓中的轨道。横流扩散率在南部回流区，靠近地形障碍处和在KE射流的下游都增加了，在KE射流中流量减弱了。沿流扩散率比跨流扩散率大得多，与涡流的大小有很好的相关性。 KE射流仅在某些经度范围内抑制横流混合。这项研究通过线性局部斜压不稳定性分析和使用Radon变换的POP模型中的涡流相速度来估算临界层深度。后者是横流方向上较大混合长度的更好预测器。临界层理论最适用于远离地形的强射流区域。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第8期|2191-2211|共21页
  • 作者

    Ru Chen; Julie L. McClean; Sarah T. Gille; Alexa Griesel;

  • 作者单位

    Scripps Institution of Oceanography, University of California, San Diego, 8622 Kennel Way, La Jolla, CA 92037;

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California;

    Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California;

    KlimaCampus, University of Hamburg, Germany;

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