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首页> 外文期刊>Journal of Physical Oceanography >Propagation of Low-Mode Internal Waves through the Ocean
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Propagation of Low-Mode Internal Waves through the Ocean

机译：低模内波在海洋中的传播

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The baroclinic tides play a significant role in the energy budget of the abyssal ocean. Although the basic principles of generation and propagation are known, a clear understanding of these phenomena in the complex ocean environment is only now emerging. To advance this effort, a ray model is developed that quantifies the effects of spatially variable topography, stratification, and planetary vorticity on the horizontal propagation of internal gravity modes. The objective is to identify "baroclinic shoals" where wave energy is spatially concentrated and enhanced dissipation might be expected. The model is then extended to investigate the propagation of internal waves through a barotropic mesoscale current field. The refraction of tidally generated internal waves at the Hawaiian Ridge is examined using an ensemble of mesoscale background realizations derived from weekly Ocean Topography Experiment (TOPEX)/Poseidon altim-etric measurements. The path of mode 1 is only slightly affected by typical currents, although its phase becomes increasingly random as the propagation distance from the source increases. The effect of the currents becomes more dramatic as mode number increases. For modes 3 and higher, wave phase can vary between realizations by ±π only a few wavelengths from the source. This phase variability reduces the magnitude of the baroclinic signal seen in altimetric data, creating a fictitious energy loss along the propagation path. In the TOPEX/Poseidon observations, the mode-1 M_2 internal tide does appear to lose significant energy as it propagates southwestward from the Hawaiian Ridge. The simulations suggest that phase modulation by mesoscale flows could be responsible for a large fraction of this apparent loss. In contrast, northeast-propagating internal tides encounter a less energetic mesoscale and should experience limited refraction. The apparent energy loss seen in the altimetric data on the north side of the ridge might indeed be real.
机译：斜压潮在深海的能源预算中起着重要作用。尽管生成和传播的基本原理是已知的，但是直到现在才对复杂的海洋环境中的这些现象有了清晰的了解。为了推动这项工作，开发了一种射线模型，该模型量化了空间可变形貌，分层和行星涡度对内部重力模式水平传播的影响。目的是确定波能在空间上集中并且可能期望增强消散的“斜压浅滩”。然后扩展该模型以研究内部波通过正压中尺度电流场的传播。使用从每周海洋地形实验（TOPEX）/海神测高仪测量得出的中尺度背景实现的整体，检查潮汐产生的内波在夏威夷山脊的折射。模式1的路径仅受典型电流的影响，尽管其相位随着距电源的传播距离增加而变得越来越随机。随着模数增加，电流的影响变得更加明显。对于模式3和更高的模式，波相位可以在实现之间变化，仅与源之间的几个波长相差±π。这种相位可变性降低了在高程数据中看到的斜压信号的幅度，从而在传播路径上产生了虚构的能量损失。在TOPEX / Poseidon观测中，当模式1 M_2内潮从夏威夷山脊向西南传播时，似乎确实损失了大量能量。模拟表明，中尺度流的相位调制可能是造成此表观损耗的很大一部分。相反，向东北传播的内潮遇到的能量较小的中尺度，应该受到有限的折射。在山脊北侧的高程数据中看到的表观能量损耗可能确实是真实的。

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