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Submesoscale Cold Filaments in the Gulf Stream

机译：墨西哥湾流中的亚中尺度冷丝

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摘要

A set of realistic, very high-resolution simulations is made for the Gulf Stream region using the oceanic model Regional Oceanic Modeling System (ROMS) to study the life cycle of the intense submesoscale cold filaments that form on the subtropical gyre, interior wall of the Gulf Stream. The surface buoyancy gradients and ageostrophic secondary circulations intensify in response to the mesoscale strain field as predicted by the theory of filamentogenesis. It can be understood in terms of a dual frontogenetic process, along the lines understood for a single front. There is, however, a stronger secondary circulation due to the amplification at the center of a cold filament. Filament dynamics in the presence of a mixed layer are not adequately described by the classical thermal wind balance. The effect of vertical mixing of momentum due to turbulence in the surface layer is of the same order of magnitude as the pressure gradient and Coriolis force and contributes equally to a so-called turbulent thermal wind balance. Filamentogenesis is disrupted by vigorous submesoscale instabilities. The cause of the instability is the lateral shear as energy production by the horizontal Reynolds stress is the primary fluctuation source during the process; this contrasts with the usual baroclinic instability of submesoscale surface fronts. The filaments are lines of strong oceanic surface convergence as illustrated by the release of Lagrangian parcels in the Gulf Stream. Diabatic mixing is strong as parcels move across the filaments and downwell into the pycnocline. The life cycle of a filament is typically a few days in duration, from intensification to quasi stationarity to instability to dissipation.
机译：使用海洋模型区域海洋建模系统（ROMS），针对墨西哥湾流地区进行了一组现实的，非常高分辨率的模拟，以研究在亚热带回旋管，内壁上形成的强烈的亚中尺度冷丝的生命周期。海湾流。如丝发生理论所预测的那样，表面浮力梯度和年龄变质的次级循环响应中尺度应变场而增强。可以按照双重前沿发生过程来理解，沿着对于单个前沿可以理解的思路。但是，由于冷丝中心的扩增，次级循环更强。经典的热风平衡不能充分描述存在混合层时的长丝动力学。由于表层中的湍流而引起的动量的垂直混合作用与压力梯度和科里奥利力处于相同数量级，并且同样有助于所谓的湍流热风平衡。细丝亚尺度的不稳定性破坏了细丝的生成。不稳定的原因是横向剪切，因为水平雷诺应力产生的能量是该过程中的主要波动源。这与亚中尺度表面前沿通常的斜压不稳定性形成对比。细丝是强烈的海洋表面汇合线，如拉格朗日包裹在海湾流中的释放所说明。当包裹移动穿过细丝并向下进入比浓菌碱时，绝热混合很强。灯丝的寿命周期通常为几天，从增强到准平稳到不稳定到耗散。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第10期|2617-2643|共27页
  • 作者

    Gula Jonathan; Molemaker M. Jeroen; McWilliams James C.;

  • 作者单位

    Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA;

    Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA;

    Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA;

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