二维波前与internal wave模式之间的能量交换
Energy exchanges between a two-dimensional front and internal wave modes
摘要：
锋面和近慣性波是上层海洋中的高能运动，它们可以相互作用并为平衡海洋流的动能（KE）耗散提供路径。本文利用准线性模式研究了二维地转平衡锋在应变诱导的半地转锋生和内波垂直模态下的动能交换。拟线性模型的数值求解变量施加的应变大小，初始IW垂直模式，并为最小频率（近惯性，NI）和高频IWs。前IW KE交换量分别在两个锋生阶段-一个指数锐化阶段，其特征在于由一个低的罗斯贝数，并由所施加的地转应变驱动，其次是一个超指数锐化阶段，其特征在于由一阶罗斯贝数，并由非地转次级环流的收敛驱动。它表明，高频IWs迅速逃离锋区，是非常有效的提取KE从施加的地转应变场通过变形剪切生产（DSP）机制。然后将提取的KE的一部分转换为波浪势能。最小频率的IWs保持锁定锋区，因此交换能量与非地转锋面环流。在指数阶段，IWs通过DSP从地转应变中提取KE，并通过非地转切变产生（AGSP）机制将其转移到锋面次级环流中。在超指数阶段，一个新发现的机制，收敛生产（CP），这是直接联系到收敛的二次循环，在NIW KE预算中起着重要的作用。
英文摘要：
Fronts and near-inertial waves are energetic motions in the upper ocean that can interact and provide a route for kinetic energy (KE) dissipation of balanced oceanic flows. A quasilinear model is developed to study the KE exchanges between a two-dimensional geostrophically-balanced front undergoing strain-induced semigeostrophic frontogenesis and internal wave (IW) vertical modes. The quasilinear model is solved numerically for variable imposed strain magnitudes, initial IW vertical modes, and for both minimum frequency (near-inertial, NI) and high-frequency IWs. The front-IW KE exchanges are quantified separately during two frontogenetic stages -- an exponential sharpening stage that is characterized by a low Rossby number and is driven by the imposed geostrophic strain, followed by a superexponential sharpening stage that is characterized by an order-one Rossby number and is driven by the convergence of the ageostrophic secondary circulation. It is demonstrated that high-frequency IWs quickly escape the frontal zone and are very efficient at extracting KE from the imposed geostrophic strain field through the deformation shear production (DSP) mechanism. Part of the extracted KE is then converted to wave potential energy. Minimum frequency IWs remain locked to the frontal zone and therefore exchange energy with the ageostrophic frontal circulation. During the exponential stage, IWs extract KE from the geostrophic strain through DSP and transfer it to the frontal secondary circulation via the ageostrophic shear production (AGSP) mechanism. During the superexponential stage a newly identified mechanism, convergence production (CP), which is directly linked to the convergent secondary circulation, plays an important role in the NIW KE budget.
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