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首页> 外文期刊>Journal of Physical Oceanography >Internal Tide Nonstationarity and Wave-Mesoscale Interactions in the Tasman Sea
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Internal Tide Nonstationarity and Wave-Mesoscale Interactions in the Tasman Sea

机译：塔斯曼海中的内部潮汐非运动和波 - Mescle互动

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Internal tides, generated by barotropic tides flowing over rough topography, are a primary source of energy into the internal wave field. As internal tides propagate away from generation sites, they can dephase from the equilibrium tide, becoming nonstationary. Here, we examine how low-frequency quasigeostrophic background flows scatter and dephase internal tides in the Tasman Sea. We demonstrate that a semi-idealized internal tide model [the Coupled-Mode Shallow Water model (CSW)] must include two background flow effects to replicate the in situ internal tide energy fluxes observed during the Tasmanian Internal Tide Beam Experiment (TBeam). The first effect is internal tide advection by the background flow, which strongly depends on the spatial scale of the background flow and is largest at the smaller scales resolved in the background flow model (i.e., 50-400 km). Internal tide advection is also shown to scatter internal tides from vertical mode-1 to mode-2 at a rate of about 1 mW m(-2). The second effect is internal tide refraction due to background flow perturbations to the mode-1 eigenspeed. This effect primarily dephases the internal tide, attenuating stationary energy at a rate of up to 5 mW m(-2). Detailed analysis of the stationary internal tide momentum and energy balances indicate that background flow effects on the stationary internal tide can be accurately parameterized using an eddy diffusivity derived from a 1D random walk model. In summary, the results identify an efficient way to model the stationary internal tide and quantify its loss of stationarity.
机译：通过流动粗糙地形流动的压突潮汐产生的内部潮汐是内部波场的主要能量来源。由于内部潮汐远离发电场所，它们可以从均衡潮汐中取消相位，变得不存在。在这里，我们研究低频Quasigstrophic背景如何流动塔斯曼海中的散射和去除内部潮汐。我们证明半理想的内部潮汐模型[耦合模式浅水模型（CSW）]必须包括两个背景流动效果，以复制在塔斯马尼亚内部潮汐梁实验（TBeam）期间观察到的原位内部潮能量助能。第一个效果是内部潮汐通过背景流程，它强烈取决于背景流的空间尺度，并且在后台流量模型中解决的较小尺度最大（即，50-400 km）。内部潮汐平流也显示出以约1mWM（-2）的速率从垂直模式-1到模式-2散射内部潮汐。由于模式-1 eigenspeed的背景流动扰动，第二次效果是内部潮汐折射。这种效果主要反向内部潮汐，以高达5 mW mW（-2）的速率衰减静止能量。详细分析静止内部潮汐动量和能量余额表明，可以使用源自1D随机步道模型的涡流扩散率准确地参数化静止内部潮汐上的背景流动效应。总之，结果确定了模拟静止内部潮汐的有效方法，并量化其对实质性的损失。

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