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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Internal tides over abrupt topography in the Southern California Bight: Observations of diurnal waves poleward of the critical latitude
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Internal tides over abrupt topography in the Southern California Bight: Observations of diurnal waves poleward of the critical latitude

机译：南加州海岸线突变地势的内部潮汐：关键纬度的日波极向观测

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摘要

In the ocean, a mechanism for baroclinic internal tide generation is through the interaction of barotropic tidal currents with topography. Velocity profiles from a bottom-mounted acoustic Doppler current profiler are used to characterize the tidal generation of diurnal and semidiurnal internal modes over a ridge atop an abrupt 30° bathymetric slope in the Southern California Bight. This location is poleward of the critical latitude for diurnal frequency internal waves, yet the circulation is dominated by the diurnal internal tide. Overall, the structure of the diurnal internal tide resembles the first baroclinic mode. However, the mode is topographically distorted in the lower water column where it is amplified and polarized in the cross-ridge direction. The behavior of the diurnal response is contrasted with the nearly ideal appearance of the semidiurnal response. The diurnal baroclinic mode occurs as a persistent response to tidal forcing rather than because of the diurnal sea breeze as has also been suggested as an explanation for internal diurnal tides in other areas of the Southern California Bight.
机译：在海洋中，斜压内潮产生的机制是通过正压潮汐流与地形的相互作用。来自底部安装的声学多普勒电流剖面仪的速度剖面用于表征南加州海岸线陡峭的30°水深坡顶上的山脊上的日和半日内部模式的潮汐生成。此位置是昼夜频率内波临界纬度的极点，但环流主要由昼夜内部潮汐控制。总体而言，日内潮的结构类似于第一斜斜模式。但是，该模式在下水柱处在地形上会发生变形，在该处沿横脊方向放大并极化。日响应的行为与半日响应的近乎理想的外观形成对比。昼间斜压模式是对潮汐强迫的持续响应，而不是因为昼夜海风，这也可以解释为南加州海岸线其他地区的内部昼间潮汐。

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