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首页> 外文期刊>Journal of Physical Oceanography >Internal Waves and Mixing near the Kerguelen Plateau
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Internal Waves and Mixing near the Kerguelen Plateau

机译：克格伦高原附近的内波和混合

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In the stratified ocean, turbulent mixing is primarily attributed to the breaking of internal waves. As such, internal waves provide a link between large-scale forcing and small-scale mixing. The internal wave field north of the Kerguelen Plateau is characterized using 914 high-resolution hydrographic profiles from novel Electromagnetic Autonomous Profiling Explorer (EM-APEX) floats. Altogether, 46 coherent features are identified in the EM-APEX velocity profiles and interpreted in terms of internal wave kinematics. The large number of internal waves analyzed provides a quantitative framework for characterizing spatial variations in the internal wave field and for resolving generation versus propagation dynamics. Internal waves observed near the Kerguelen Plateau have a mean vertical wavelength of 200 m, a mean horizontal wavelength of 15 km, a mean period of 16 h, and a mean horizontal group velocity of 3 cm s(-1). The internal wave characteristics are dependent on regional dynamics, suggesting that different generation mechanisms of internal waves dominate in different dynamical zones. The wave fields in the Subantarctic/Subtropical Front and the Polar Front Zone are influenced by the local small-scale topography and flow strength. The eddy-wave field is influenced by the large-scale flow structure, while the internal wave field in the Subantarctic Zone is controlled by atmospheric forcing. More importantly, the local generation of internal waves not only drives large-scale dissipation in the frontal region but also downstream from the plateau. Some internal waves in the frontal region are advected away from the plateau, contributing to mixing and stratification budgets elsewhere.
机译：在分层海洋中，湍流混合主要归因于内部波浪的破裂。这样，内波提供了大规模强迫与小规模混合之间的联系。 Kerguelen高原以北的内部波场的特征是使用来自新型电磁自动剖析仪（EM-APEX）浮标的914个高分辨率水文剖面图。在EM-APEX速度曲线中总共确定了46个相干特征，并根据内部波运动学进行了解释。分析的大量内部波提供了定量框架，用于表征内部波场中的空间变化以及解决世代与传播动力学的关系。在克格伦高原附近观测到的内部波的平均垂直波长为200 m，平均水平波长为15 km，平均周期为16 h，平均水平群速度为3 cm s（-1）。内部波的特性取决于区域动力学，这表明内部波的不同生成机制在不同的动力学区域中起主导作用。亚极/亚热带锋面和极地锋带中的波场受局部小尺度地形和流动强度的影响。涡流场受大尺度流动结构的影响，而亚南极带的内部波场则受大气强迫的控制。更重要的是，内部波的局部生成不仅驱动额叶区域的大规模耗散，而且还驱动高原的下游。额叶区域的一些内部波浪被推向远离高原的地方，从而促进了其他地方的混合和分层预算。

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