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首页> 外文期刊>Journal of Physical Oceanography >Dynamic and Double-Diffusive Instabilities in a Weak Pycnocline. Part Ⅱ: Direct Numerical Simulations and Flux Laws
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Dynamic and Double-Diffusive Instabilities in a Weak Pycnocline. Part Ⅱ: Direct Numerical Simulations and Flux Laws

机译：弱碧萝oc中的动态和双扩散不稳定性。第二部分：直接数值模拟和通量定律

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摘要

This study examines the interaction of diffusive convection and shear through a series of 2D and 3D direct numerical simulations (DNS). The model employed is based on the Boussinesq equations of motion with oscillating shear represented by a forcing term in the momentum equation. This study calculates thermal diffusivities for a wide range of Froude numbers and density ratios and compares the results with those from the analysis of observational data gathered during a 2005 expedition to the eastern Weddell Sea. The patterns of layering and the strong dependence of thermal diffusivity on the density ratio described here are in agreement with observations. Additionally, the authors evaluate salinity fluxes that are inaccessible from field data and formulate a parameterization of buoyancy transport. The relative significance of double diffusion and shear is quantified through comparison of density fluxes, efficiency factor, and dissipation ratio for the regimes with/without diffusive convection. This study assesses the accuracy of the thermal production dissipation and turbulent kinetic energy balances, commonly used in microstructure-based observational studies, and quantifies the length of the averaging period required for reliable statistics and the spatial variability of heat flux.
机译：本研究通过一系列2D和3D直接数值模拟（DNS）检验了扩散对流和切变的相互作用。所采用的模型基于Boussinesq运动方程，其动量方程中的强迫项表示振荡剪切。这项研究计算了各种Froude数和密度比的热扩散率，并将结果与​​2005年对东部韦德尔海的一次远征中收集的观测数据的分析结果进行了比较。此处描述的分层模式以及热扩散率对密度比的强烈依赖性与观察结果一致。此外，作者评估了无法从现场数据获得的盐度通量，并制定了浮力输运参数。通过比较有/无扩散对流情况下的密度通量，效率因子和耗散率，可以量化双重扩散和剪切的相对重要性。这项研究评估了通常用于基于微结构的观测研究中所使用的热量产生耗散和湍动能平衡的准确性，并量化了可靠统计所需的平均周期长度和热通量的空间变异性。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第8期|1992-2012|共21页
  • 作者

    Jason D. Flanagan; Timour Radko; William J. Shaw; Timothy P. Stanton;

  • 作者单位

    Graduate School of Engineering and Applied Sciences, Department of Oceanography, Naval Postgraduate School, Monterey, CA 93943;

    Department of Oceanography, Naval Postgraduate School, Monterey, California;

    Department of Oceanography, Naval Postgraduate School, Monterey, California;

    Department of Oceanography, Naval Postgraduate School, Monterey, California;

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