A Parameterization of Local and Remote Tidal Mixing
A Parameterization of Local and Remote Tidal Mixing
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DOI：
10.1029/2020ms002065
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发表时间：
2020-05-01
影响因子：
6.8
通讯作者：
Hibiya, T.
中科院分区：
文献类型：
--
作者：
de Lavergne, C.;Vic, C.;Hibiya, T.
垂直混合常被认为是海洋模型的阿喀琉斯之踵。特别是，很少有模型包括一个全面的和能量约束的参数化混合的内部海洋潮汐。在这里，我们提出了一个能量守恒的混合计划，占本地打破的高模式内潮和低模式内潮的远程耗散。该计划依赖于四个静态的二维地图的内部潮汐耗散，构建使用模式的拉格朗日跟踪能量束从源到汇。每个地图都与一个独特的耗散过程和相应的垂直结构。应用到观测气候学的分层，该计划产生了一个全球三维图的耗散比较，以及与现有的微观结构观测和上层海洋精细结构混合的估计。这种相对的协议，无论是在幅度和空间结构的海洋盆地，表明内部潮汐的基础上，在全球范围内的海洋内部观测到的耗散。因此，拟议的参数化，预计将提高理解，绘图和海洋混合建模。
Vertical mixing is often regarded as the Achilles' heel of ocean models. In particular, few models include a comprehensive and energy-constrained parameterization of mixing by internal ocean tides. Here, we present an energy-conserving mixing scheme which accounts for the local breaking of high-mode internal tides and the distant dissipation of low-mode internal tides. The scheme relies on four static two-dimensional maps of internal tide dissipation, constructed using mode-by-mode Lagrangian tracking of energy beams from sources to sinks. Each map is associated with a distinct dissipative process and a corresponding vertical structure. Applied to an observational climatology of stratification, the scheme produces a global three-dimensional map of dissipation which compares well with available microstructure observations and with upper-ocean finestructure mixing estimates. This relative agreement, both in magnitude and spatial structure across ocean basins, suggests that internal tides underpin most of observed dissipation in the ocean interior at the global scale. The proposed parameterization is therefore expected to improve understanding, mapping, and modeling of ocean mixing.