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The Dynamics of Mixed Layer Deepening during Open-Ocean Convection

机译：开放海洋对流期间混合层的动态

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摘要

Open-ocean convection is a common phenomenon that regulates mixed layer depth and ocean ventilation in the high-latitude oceans. However, many climate model simulations overestimate mixed layer depth during open-ocean convection, resulting in excessive formation of dense water in some regions. The physical processes controlling transient mixed layer depth during open-ocean convection are examined using two different numerical models: a high-resolution, turbulence-resolving nonhydrostatic model and a large-scale hydrostatic ocean model. An isolated destabilizing buoyancy flux is imposed at the surface of both models and a quasi-equilibrium flow is allowed to develop. Mixed layer depth in the turbulence-resolving and large-scale models closely aligns with existing scaling theories. However, the large-scale model has an anomalously deep mixed layer prior to quasi-equilibrium. This transient mixed layer depth bias is a consequence of the lack of resolved turbulent convection in the model, which delays the onset of baroclinic instability. These findings suggest that in order to reduce mixed layer biases in ocean simulations, parameterizations of the connection between baroclinic instability and convection need to be addressed.
机译：开放海洋对流是一种常见的现象，调节高纬度海洋中的混合层深度和海洋通风。然而，许多气候模型模拟在开放海洋对流期间高估混合层深度，导致一些地区的致密水形成过多。使用两种不同的数值模型检查控制开放海洋对流期间的瞬态混合层深度的物理过程：高分辨率，湍流 - 解析非水压模型和大规模的静水压海洋模型。孤立的稳定性浮力通量在两种模型的表面上施加，并且允许允许拟平衡流动发生。混合层深度在湍流中，分辨率和大规模模型与现有的缩放理论紧密对齐。然而，在准平衡之前，大规模模型具有异常的深混合层。这种瞬态混合层深度偏压是模型中缺乏解决的湍流对流的结果，这延迟了倒退的龈上不稳定性的开始。这些发现表明，为了减少海洋仿真中的混合层偏差，需要解决曲金不稳定性和对流之间的连接的参数。

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  • 来源
    《Journal of Physical Oceanography》 |2020年第6期|1625-1641|共17页
  • 作者

    Taimoor Sohail; BISHAKHDATTA GAYEN; Andrew McC. Hogg;

  • 作者单位

    Research School of Earth Sciences and ARC Centre of Excellence for Climate Extremes Australian National University Canberra Australian Capital Territory Australia;

    Department of Mechanical Engineering University of Melbourne Melbourne Australia and Centre for Atmospheric and Oceanic Sciences Indian Institute of Science Bangalore India;

    Research School of Earth Sciences and ARC Centre of Excellence for Climate Extremes Australian National University Canberra Australian Capital Territory Australia;

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