Direct Simulation of Internal Wave Energy Transfer
Direct Simulation of Internal Wave Energy Transfer
复制标题
内波能量传递的直接模拟
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
E. D’Asaro
中科院分区：
文献类型：
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作者：
K. Winters;E. D’Asaro
摘要采用三维非静力数值模式计算了Garrett-Munk内波场衰减过程中的非线性能量传输。在2000米深的指数分层模式海洋中，计算了水平尺度约1至80公里和垂直模式数小于约40的无粘波相互作用。从这些尺度的能量转移率较小，数值阻尼尺度是用来预测的耗散率e在开放的海洋中纬度温跃层。与基于共振相互作用和程函理论的理论分析相一致，模拟结果预测了e_（？）2 N_2，其中e_（？）和N分别为内波能量密度和环境浮力频率。模拟的耗散率的大小被证明是在良好的协议与耗散测量中纬度温跃层从六个不同的网站。结果表明，在海洋中的耗散和混合率…
Abstract A three-dimensional nonhydrostatic numerical model is used to calculate nonlinear energy transfers within decaying Garrett–Munk internal wavefields. Inviscid wave interactions are calculated over horizontal scales from about 1 to 80 km and for vertical mode numbers less than about 40 in an exponentially stratified model ocean 2000 m deep. The rate of energy transfer from these scales to smaller, numerically damped scales is used to make predictions of the dissipation rate e in the open ocean midlatitude thermocline. In agreement with the theoretical analyses based on resonant interaction and eikonal theories, the simulation results predict e ∝ Ē2 N2, where Ē and N are the internal wave energy density and the ambient buoyancy frequency respectively. The magnitudes of the simulated dissipation rates are shown to be in good agreement with the dissipation measurements taken from six diverse sites in the midlatitude thermocline. The results suggest that the rates of dissipation and mixing in the ocean...