Implications of Ocean Bottom Reflection for Internal Wave Spectra and Mixing
Implications of Ocean Bottom Reflection for Internal Wave Spectra and Mixing
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海底反射对内波谱和混合的影响
DOI：
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发表时间：
1985
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通讯作者：
C. Eriksen
中科院分区：
文献类型：
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作者：
C. Eriksen
摘要将倾斜海底反射的线性内波模型应用于深海典型的水平各向同性波场，得到强扰动频率-垂直波数能谱。在内波的临界频率特性的环境和底坡的频谱是由不可积的奇异性。根据观测要求，海底附近的内波谱在垂直方向上松弛到开阔的深海水平和几百米以内的形状，这意味着垂直于边界的通量不平衡。必须在内波频谱上重新分布或从中损失的通量为O（10−2 W m−2），大于内波估计的大多数其他能量传递机制。这种通量不平衡的一小部分用于混合，可以解释流域平均有效垂直扩散率为10−4 m2 s−1。海底反射不仅是内波能量的一个可能的、强有力的汇，而且是内波能量的一种手段。
Abstract A linear internal wave model for reflection off a sloping bottom applied to a field of horizontally isotropic waves typical of the deep ocean leads to a strongly perturbed frequency-vertical wavenumber energy spectrum. The spectrum is dominated by a nonintegrable singularity at the internal wave critical frequency characteristic of the environment and bottom slope. An observational requirement that the internal wave spectrum near the bottom relax to the open deep-ocean level and shape within a few hundred meters vertically implies a flux imbalance normal to the boundary. The flux that must be redistributed over the internal wave spectrum, or lost from it, amounts to O(10−2 W m−2), larger than for most other energy transfer mechanisms estimated for internal waves. A small fraction of this flux imbalance applied to mixing can account for a basin-averaged effective vertical diffusivity of 10−4 m2 s−1. Bottom reflection represents not only a likely and powerful sink for internal wave energy, but a me...