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首页> 外文期刊>Journal of Physical Oceanography >Eddy-Induced Modulation of Turbulent Dissipation over Rough Topography in the Southern Ocean
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Eddy-Induced Modulation of Turbulent Dissipation over Rough Topography in the Southern Ocean

机译：涡对南大洋地形湍流耗散的调制

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Mesoscale eddies are universal features of the ocean circulation, yet the processes by which their energy is dissipated remain poorly understood. One hypothesis argues that the interaction of strong geostrophic flows with rough bottom topography effects an energy transfer between eddies and internal waves, with the breaking of these waves causing locally elevated dissipation focused near the sea floor. This study uses hydrographic and velocity data from a 1-yr mooring cluster deployment in the Southern Ocean to test this hypothesis. The moorings were located over a small (~10km) topographic obstacle to the east of Drake Passage in a region of high eddy kinetic energy, and one was equipped with an ADCP at 2800-m depth from which internal wave shear variance and dissipation rates were calculated. Examination of the ADCP time series revealed a predominance of upward-propagating internal wave energy and a significant correlation (r = 0.45) between shear variance levels and subinertial near-bottom current speeds. Periods of strong near-bottom flow coincided with increased convergence of eddy-induced interfacial form stress in the bottom 1500 m. Predictions of internal wave energy radiation were made from theory using measured near-bottom current speeds, and the mean value of wave radiation (5.3 mW m~(-2)) was sufficient to support the dissipated power calculated from the ADCP. A significant temporal correlation was also observed between radiated and dissipated power. Given the ubiquity of strong eddy flows and rough topography in the Southern Ocean, the transfer from eddy to internal wave energy is likely to be an important term in closing the ocean energy budget.
机译：中尺度涡旋是海洋环流的普遍特征，但是消散其能量的过程仍然知之甚少。一种假设认为，强烈的地转流与粗糙的底部地形的相互作用会影响涡流和内部波浪之间的能量转移，这些波浪的破裂导致局部升高的耗散集中在海床附近。这项研究使用来自南大洋1年系泊集群部署的水文和速度数据来检验这一假设。系泊设备位于高涡动能区域中位于Drake通道以东的小地形障碍物（〜10 km）上，并且在2800-m深度处装有ADCP，从该处可以看到内部波切变和耗散率计算。对ADCP时间序列的检查显示，内部波能量向上传播占优势，并且剪切方差水平与近惯性近底电流速度之间存在显着相关性（r = 0.45）。近底部强流周期与底部1500 m涡流引起的界面形态应力的收敛性增加相吻合。内部波能辐射的预测是根据理论上使用测得的近底电流速度进行的，并且波辐射的平均值（5.3 mW m〜（-2））足以支持根据ADCP计算​​得出的耗散功率。在辐射功率和耗散功率之间还观察到显着的时间相关性。鉴于南大洋普遍存在强涡流和崎top的地形，从涡流向内波能的转移可能是关闭海洋能收支的重要术语。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第11期|2288-2308|共21页
  • 作者

    J. Alexander Brearley; Katy L. Sheen; Alberto C. Naveira Garabato; David A. Smeed; Stephanie Waterman;

  • 作者单位

    Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom;

    Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom;

    Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom;

    Marine Physics and Ocean Climate, National Oceanography Centre Southampton, Southampton, United Kingdom;

    Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom, and Climate Change Research Centre and ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales, Australia;

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