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首页> 外文期刊>Journal of Physical Oceanography >Submesoscale Eddy Vertical Covariances and Dynamical Constraints from High-Resolution Numerical Simulations
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Submesoscale Eddy Vertical Covariances and Dynamical Constraints from High-Resolution Numerical Simulations

机译：来自高分辨率数值模拟的基础辅助垂直协方差和动态约束

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We analyze high-resolution (1 km) simulations of the western Pacific, Gulf of Mexico, and Arabian Sea to understand submesoscale eddy dynamics. A mask based on the Okubo-Weiss parameter isolates small-scale eddies, and we further classify those with ∣ζ/f∣ ≥ 1 as being submesoscale eddies. Cyclonic submesoscale eddies exhibit a vertical depth structure in which temperature anomalies from the large-scale background are negative. Peak density anomalies associated with cyclonic submesoscale eddies are found at a depth approximately twice the mixed layer depth (MLD). Within anticyclonic submesoscale eddies, temperature anomalies are positive and have peak density anomalies at the MLD. The depth-depth covariance structure for the cyclonic and anticyclonic submesoscale eddies have maxima over a shallow region near the surface and weak off diagonal elements. The observed vertical structure suggests that submesoscale eddies have a shallower depth profile and smaller vertical correlation scales when compared to the mesoscale phenomenon. We test a two-dimensional submesoscale eddy dynamical balance. Compared to a geostrophic dynamical balance using only pressure gradient and Coriolis force, including velocity tendency and advection produces lower errors by about 20%. In regions with strong tides and associated internal waves (western Pacific and Arabian Sea), using the mixed layer integrated small-scale steric height within the dynamical equations produces the lowest magnitude errors. In areas with weak tides (Gulf of Mexico), using small-scale sea surface height (SSH) produces the lowest magnitude errors. Recovering a submesoscale eddy with the correct magnitude and rotation requires integration of small-scale specific volume anomalies well below the mixed layer.
机译：我们分析了西太平洋，墨西哥湾和阿拉伯海的高分辨率（1 km）模拟，以了解基础镜头涡流动态。基于Okubo-Weiss参数的面具隔离小规模Eddies，我们进一步将那些与ImpseScale Eddies一起分类为|ζ/ f|≥1。循环潜水镜eDDIES表现出垂直深度结构，其中大尺寸背景中的温度异常是负的。与旋风子痫射精相关的峰密度异常在混合层深度（MLD）的深度约为两倍。在防旱麻碱尺度eDDIES中，温度异常是正的，在MLD处具有峰值密度异常。旋风和防寒克隆基质阶段漩涡铸造的深度深度协方差结构在表面附近的浅区域和弱对角线元件附近的最大值。观察到的垂直结构表明，与Mesoscale现象相比，基质尺度eDDIES具有较浅的深度曲线和较小的垂直相关尺度。我们测试二维子张镜头涡流动态平衡。与仅使用压力梯度和科里奥利力的热性动力平衡相比，包括速度倾向，平流产生较低的误差约20％。在具有强大潮汐和相关内波（西太平洋和阿拉伯海）的地区，使用动态方程内的混合层集成的小型空间高度产生最低幅度误差。在潮汐潮汐（墨西哥湾）的地区，使用小型海面高度（SSH）产生最低幅度误差。用正确的幅度和旋转恢复基质尺度涡流需要在混合层下方的小规模特定体积异常集成。

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  • 来源
    《Journal of Physical Oceanography》 |2020年第4期|1087-1115|共29页
  • 作者

    JOSEPH M. DADDEZIO; GREGG A. JACOBS; MAX YAREMCHUK; INNOCENT SOUOPGUI;

  • 作者单位

    Ocean Dynamics and Prediction Naval Research Laboratory Slennis Space Center Mississippi;

    Ocean Dynamics and Prediction Naval Research Laboratory Slennis Space Center Mississippi;

    Ocean Dynamics and Prediction Naval Research Laboratory Slennis Space Center Mississippi;

    Department of Physics University of New Orleans New Orleans Louisiana;

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