Penetration of Wind-Generated Near-Inertial Waves into a Turbulent Ocean
Penetration of Wind-Generated Near-Inertial Waves into a Turbulent Ocean
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DOI：
10.1175/jpo-d-19-0319.1
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发表时间：
2020-06-01
影响因子：
3.5
通讯作者：
Young, William R.
中科院分区：
文献类型：
--
作者：
Asselin, Olivier;Young, William R.
一个理想化的风暴的情况下，风产生的惯性波相互作用的湍流斜压准地转流检查。通过旋转具有基于观测的分层剖面的Eady模型来初始化流动。风暴被建模为一个初始值问题的混合层限制，水平均匀的惯性振荡。原始惯性振荡按照Young和Ben Jelloul的相位平均模型演化。波通过改变位涡反馈到流动上。在最初的几天里，折射占主导地位，波能被负（正）涡度区域吸引（排斥）。波能随后在反气旋涡旋的引导下向下排入海洋内部。当波能遇到减弱的涡度时，这种排水停止。一两周后，波能在负涡度特征的底部积累，也就是说，在较浅的深度处，波能沿着沿着动结构积累，在较深的深度处，波能在较大的反气旋涡中积累。波浪反馈往往会削弱漩涡，从而减缓波浪向海洋内部的渗透。然而，这种非线性效应即使在强风暴中也很弱。
An idealized storm scenario is examined in which a wind-generated inertial wave interacts with a turbulent baroclinic quasigeostrophic flow. The flow is initialized by spinning up an Eady model with a stratification profile based on observations. The storm is modeled as an initial value problem for a mixed layer confined, horizontally uniform inertial oscillation. The primordial inertial oscillation evolves according to the phase-averaged model of Young and Ben Jelloul. Waves feed back onto the flow by modifying the potential vorticity. In the first few days, refraction dominates and wave energy is attracted (repelled) by regions of negative (positive) vorticity. Wave energy is subsequently drained down into the interior ocean guided by anticyclonic vortices. This drainage halts as wave energy encounters weakening vorticity. After a week or two, wave energy accumulates at the bottom of negative vorticity features, that is, along filamentary structures at shallow depths and in larger anticyclonic vortices at greater depths. Wave feedback tends to weaken vortices and thus slows the penetration of waves into the ocean interior. This nonlinear effect, however, is weak even for vigorous storms.