Internal Wave–Wave Interactions. Part I: The Role of Internal Wave Vertical Divergence
Internal Wave–Wave Interactions. Part I: The Role of Internal Wave Vertical Divergence
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内波与波相互作用。第一部分：内波垂直发散的作用。
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. Kunze
中科院分区：
文献类型：
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作者：
Hai;E. Kunze
摘要通过随机三维Garrett和Munk内波背景对小尺度内波进行数值射线追踪。过去对内波能量向小尺度转移的射线追踪研究只考虑了与背景垂直切变Vz = (Uz, Vz)的相互作用。这里，尺度分析和数值模拟表明垂直散度Wz的作用不可忽视。背景低频垂直切变Vz将高频测试波向小尺度转移，背景垂直辐散Wz将低频测试波向小尺度转移。这些射线追踪结果类似于弱共振-三元相互作用理论，尽管这里考虑的相互作用并不局限于弱或共振。
Abstract Small-scale internal waves are numerically ray-traced through random 3D Garrett and Munk internal wave backgrounds. Past ray-tracing investigations of the transfer of internal wave energy toward small scales have considered only interactions with background vertical shear Vz = (Uz, Vz). Here, scale analysis and numerical simulations indicate a nonnegligible role for vertical divergence Wz. Background low-frequency vertical shear Vz transfers high-frequency test waves toward small scales while background vertical divergence Wz transfers low-frequency test waves toward small scales. These ray-tracing results resemble those of weak resonant-triad interaction theory, although the interactions considered here are not limited to be weak or resonant.