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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Rates and mechanisms of turbulent dissipation and mixing in the Southern Ocean: Results from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES)
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Rates and mechanisms of turbulent dissipation and mixing in the Southern Ocean: Results from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES)

机译：南大洋湍流消散和混合的速率和机理：南大洋的双斜和等渗混合实验的结果

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摘要

The spatial distribution of turbulent dissipation rates and internal wavefield characteristics is analyzed across two contrasting regimes of the Antarctic Circumpolar Current (ACC), using microstructure and finestructure data collected as part of the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). Mid-depth turbulent dissipation rates are found to increase from O(1×10-10Wkg -1) in the Southeast Pacific to O(1×10-9Wkg -1) in the Scotia Sea, typically reaching 3×10-9Wkg -1 within a kilometer of the seabed. Enhanced levels of turbulent mixing are associated with strong near-bottom flows, rough topography, and regions where the internal wavefield is found to have enhanced energy, a less-inertial frequency content and a dominance of upward propagating energy. These results strongly suggest that bottom-generated internal waves play a major role in determining the spatial distribution of turbulent dissipation in the ACC. The energy flux associated with the bottom internal wave generation process is calculated using wave radiation theory, and found to vary between 0.8 mW m~ (-2) in the Southeast Pacific and 14 mW m~(-2) in the Scotia Sea. Typically, 10%-30% of this energy is found to dissipate within 1 km of the seabed. Comparison between turbulent dissipation rates inferred from finestructure parameterizations and microstructure-derived estimates suggests a significant departure from wave-wave interaction physics in the near-field of wave generation sites. Key Points Turbulence increases by an order of magnitude between SE Pacific & Scotia Sea Lee waves play a pivotal role in Southern Ocean diapycnal mixing and circulation 10-30 % of Southern Ocean predicted lee wave energy is dissipated locally
机译：利用作为南大洋斜向和同向混合实验的一部分收集的微结构和精细结构数据，分析了南极绕极洋流（ACC）的两种不同形式的湍流耗散率和内部波场特征的空间分布。发现中深度湍流耗散率从东南太平洋的O（1×10-10Wkg -1）增加到斯科舍海的O（1×10-9Wkg -1），通常达到3×10-9Wkg -1在海床一公里内。湍流混合程度的提高与强的近底流动，粗糙的地形以及发现内部波场具有增强的能量，较低惯性的频率含量以及向上传播的能量占优势的区域有关。这些结果有力地表明，底部产生的内部波在确定ACC中湍流消散的空间分布方面起着重要作用。利用波辐射理论计算了与底部内部波产生过程相关的能量通量，发现其在东南太平洋的0.8 mW m〜（-2）和在斯科舍海的14 mW m〜（-2）之间变化。通常，发现该能量的10％-30％在海床1公里内消散。由精细结构参数化和微观结构推定的推论得出的湍流耗散率之间的比较表明，在波发生地点的近场中，波波相互作用物理学有很大的不同。要点东南太平洋和斯科舍海之间的湍流增加了一个数量级。李波在南大洋的强直混合和循环中起着关键作用。预计南大洋10-30％的回风能量会在本地消散

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