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首页> 外文期刊>Journal of Physical Oceanography >Interaction of Near-Inertial Waves with an Anticyclonic Vortex
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Interaction of Near-Inertial Waves with an Anticyclonic Vortex

机译：近惯性波与反气旋涡旋的相互作用

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摘要

Anticyclonic vortices focus and trap near-inertial waves so that near-inertial energy levels are elevated within the vortex core. Some aspects of this process, including the nonlinear modification of the vortex by the wave, are explained by the existence of trapped near-inertial eigenmodes. These vortex eigenmodes are easily excited by an initial wave with horizontal scale much larger than that of the vortex radius. We study this process using a wave-averaged model of near-inertial dynamics and compare its theoretical predictions with numerical solutions of the three-dimensional Boussinesq equations. In the linear approximation, the model predicts the eigenmode frequencies and spatial structures, and a near-inertial wave energy signature that is characterized by an approximately time-periodic, azimuthally invariant pattern. The wave-averaged model represents the nonlinear feedback of the waves on the vortex via a wave-induced contribution to the potential vorticity that is proportional to the Laplacian of the kinetic energy density of the waves. When this is taken into account, the modal frequency is predicted to increase linearly with the energy of the initial excitation. Both linear and nonlinear predictions agree convincingly with the Boussinesq results.
机译：反自克隆漩涡焦点和陷阱近惯性波动，使近惯性能量水平升高在涡旋芯内。该方法的一些方面，包括捕获的近惯性特征幅度的存在的涡流的非线性修改。这些涡旋特征模块容易被初始波容易激发，水平刻度远大于涡流半径的尺度。我们使用近乎惯性动力学的波平均模型研究该过程，并将其与三维Boussinesq方程的数值解的理论预测进行比较。在线性近似值中，模型预测特征模频率和空间结构，以及近惯性波能量特征，其特征在于大致时间周期，方位异不变的模式。波平均模型代表通过波动引起的波动对涡流对涡流的非线性反馈，其与波动的动能密度的拉普拉斯的拉普拉斯成比例的潜在涡流。当考虑到这一点时，预测模态频率随着初始激励的能量而线性增加。线性和非线性预测既与Boussinesq结果令人信服。

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