The redistribution and dissipation of internal wave energy arising from the conversion at mid-ocean ridges of the barotropic tide is studied in a set of numerical experiments. A two-dimensional non-hydrostatic model with 100 m horizontal and 10–25 m vertical resolution is used to represent the detailed processes near an idealised ridge. Conventional internal wave beams at the tidal frequency, [superscript ѡ]M[subscript 2], appear. At the ridge crest, strong tidal energy dissipation occurs that both mixes the fluid and generates strong near-inertial oscillations radiating in near-horizontal beams. Resonant triad interaction between the tidal and inertial motions in turn produces beams at ([superscript ѡ]M[subscript 2] - f) and with high shear, thus effectively mixing fluid at considerable heights above the ridge crest.
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机译:通过一系列数值试验研究了正压潮中洋脊转换引起的内波能量的重新分布和耗散。二维非静水模型,水平分辨率为100 m,垂直分辨率为10–25 m,用于表示理想脊附近的详细过程。出现了潮汐频率[internal] M [下标2]的常规内部光束。在山脊处,会发生强烈的潮汐能耗散,既会混合流体,又会产生强烈的近惯性振动,并以近水平的射线辐射。潮汐运动与惯性运动之间的共振三合会相互作用反过来在(atM] [下标2]-f)处产生高剪切力的梁,从而有效地混合了脊顶上方相当高度的流体。
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