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Mesoscale and Submesoscale Effects on Mixed Layer Depth in the Southern Ocean

机译：中尺度和亚尺度对南洋混合层深度的影响

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Submesoscale dynamics play a key role in setting the stratification of the ocean surface mixed layer and mediating air-sea exchange, making them especially relevant to anthropogenic carbon uptake and primary productivity in the Southern Ocean. In this paper, a series of offline-nested numerical simulations is used to study submesoscale flow in theDrake Passage and Scotia Sea regions of the Southern Ocean. These simulations are initialized from an ocean state estimate for late April 2015, with the intent to simulate features observed during the Surface Mixed Layer at Submesoscales (SMILES) research cruise, which occurred at that time and location. The nested models are downscaled from the original state estimate resolution of 1/12 degrees and grid spacing of about 8 km, culminating in a submesoscale-resolving model with a resolution of 1/192 degrees and grid spacing of about 500m. The submesoscale eddy field is found to be highly spatially variable, with pronounced hot spots of submesoscale activity. These areas of high submesoscale activity correspond to a significant difference in the 30-day average mixed layer depth DHML between the 1/12 degrees and 1/192 degrees simulations. Regions of large vertical velocities in the mixed layer correspond with high mesoscale strain rather than large DHML. It is found that DHML is well correlated with the mesoscale density gradient but weakly correlated with both the mesoscale kinetic energy and strain. This has implications for the development of submesoscale eddy parameterizations that are sensitive to the character of the large-scale flow.
机译：亚尺度尺度的动力学在设定海洋表层混合层的分层和介导海-气交换方面起着关键作用，这使其尤其与南大洋的人为碳吸收和初级生产力有关。本文使用一系列离线嵌套的数值模拟来研究南大洋德雷克海峡和斯科舍海地区的亚中尺度水流。这些模拟是根据2015年4月下旬的海洋状况估算值初始化的，目的是模拟在当时和所在位置发生的亚微尺度表面混合层（SMILES）研究航行期间观测到的特征。嵌套模型从原始状态估计分辨率的1/12度和约8 km的网格按比例缩小，最终形成分辨率为1/192度和约500m的亚中尺度分辨率的模型。发现亚中尺度涡流在空间上高度可变，具有亚中尺度活动的明显热点。这些亚中尺度活动度较高的区域对应于1/12度和1/192度模拟之间30天平均混合层深度DHML的显着差异。混合层中垂直速度大的区域对应于高中尺度应变，而不是较大的DHML。发现DHML与中尺度密度梯度相关性很好，而与中尺度动能和应变相关性很弱。这对亚尺度的涡流参数化的发展具有重要意义，该参数化对大规模流的特征很敏感。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第9期|2173-2188|共16页
  • 作者

    Bachman S. D.; Taylor J. R.; Adams K. A.; Hosegood P. J.;

  • 作者单位

    Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge, England|Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA;

    Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge, England;

    Plymouth Univ, Sch Biol & Marine Sci, Plymouth, Devon, England;

    Plymouth Univ, Sch Biol & Marine Sci, Plymouth, Devon, England;

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