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首页> 外文期刊>Journal of Physical Oceanography >Energy Transmission by Barotropic Rossby Waves Revisited
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Energy Transmission by Barotropic Rossby Waves Revisited

机译：再谈正压罗斯比波的能量传输

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摘要

This article presents a semianalytic method to investigate the properties of energy transmission across bottom topography by barotropic Rossby waves. The method is first used to revisit the analytical estimates derived from wave-matching techniques and Wentzel-Kramers-Brillouin (WKB) approximations. The comparison between the semianalytic method and WKB indicates that the results of the latter are valid for waves with periods longer than a month and ridges taller than ～1000 m and wider than ～500 km. For these parameter values both methods predict the passage of low-frequency waves and the reflection of high-frequency waves. The semianalytic method is then used to discuss the energy transmission properties of a cross section of the Mid-Atlantic Ridge. It is shown that the filtering characteristics of realistic bottom topographies depend not only on the spatial scale set by the cross-section envelope, but also on the scales of the individual peaks. This dependence is related to the fact that topographies narrower than ～400 km (e.g., peaks) are high-pass filters of incoming waves, while topographies wider than that (e.g., cross-section envelopes) are low-pass filters. In the particular case of the Mid-Atlantic Ridge the neglect of the contribution of individual peaks leads to an erroneous estimate of the filtering properties of the massif.
机译：本文提出了一种半解析方法，研究正压罗斯比波在底部地形上的能量传输特性。该方法首先用于重新研究从波匹配技术和Wentzel-Kramers-Brillouin（WKB）近似得出的分析估计。半解析法与WKB的比较表明，后者的结果对于周期大于一个月且山脊大于〜1000 m且大于〜500 km的波浪有效。对于这些参数值，两种方法都可以预测低频波的通过和高频波的反射。然后使用半解析方法讨论大西洋中脊横截面的能量传输特性。结果表明，实际底部地形的过滤特性不仅取决于横截面包络设置的空间尺度，而且还取决于各个峰的尺度。这种依赖性与以下事实有关：小于约400 km的地形（例如，峰值）是入射波的高通滤波器，而比该范围宽的地形（例如，截面包络）是低通滤波器。在大西洋中脊的特殊情况下，忽略各个峰的贡献会导致对地块过滤特性的错误估计。

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