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首页> 外文期刊>Journal of Physical Oceanography >High-Frequency Internal Waves on the Oregon Continental Shelf
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High-Frequency Internal Waves on the Oregon Continental Shelf

机译：俄勒冈大陆架上的高频内波

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Measurements of vertical velocity by isopycnal-following, neutrally buoyant floats deployed on the Oregon shelf during the summers of 2000 and 2001 were used to characterize internal gravity waves on the shelf using measurements of vertical velocity. The average spectrum of Wentzel-Kramers-Brillouin (WKB)-scaled vertical kinetic energy has the level predicted by the Garrett-Munk model (GM79), plus a narrow M_2 tidal peak and a broad high-frequency peak extending from about 0.1N to N and rising a decade above GM79. The high-frequency peak varies in energy coherently with time across its entire bandwidth. Its energy is independent of the tidal energy. The energy in the "continuum" region between the peaks is weakly correlated with the level of the high-frequency peak energy and is independent of the tidal peak energy. The vertical velocity is not Gaussian but is highly intermittent, with a calculated kurtosis of 19. The vertical kinetic energy varies geographically. Low energy is found offshore and nearshore. The highest energy is found near a small seamount. High energy is found over the rough topography of Heceta Bank and near the shelf break. The highest energy occurs as packets of high-frequency waves, often occurring on the sharp downward phase of the M_2 internal tide and called "tidal solibores." A few isolated waves with high energy are also found. Of the 1-h periods with the highest vertical kinetic energy, 31% are tidal solibores, 8% are isolated waves, and the remainder of the periods appear unorganized. The two most energetic tidal solibores were examined in detail. As compared with the steady, propagating, two-dimensional, inviscid, internal-wave solutions to the equations of motion with no background shear [i.e., the Dubreil-Jacotin-Long (DJL) equation], all but the most energetic observed waveforms are too narrow for their height to be solitary waves. Despite the large near-N peak in vertical kinetic energy, the M_2 internal tide contributes over 80% of the energy, ignoring near-inertial waves. The tidal solibores make a very small contribution, 0.5%, to the overall internal-wave energy.
机译：在2000年和2001年夏季，通过在俄勒冈州陆架上布置的等深线跟随的中性浮力浮标来测量​​竖向速度，以利用竖向速度的测量来表征架子上的内部重力波。 Wentzel-Kramers-Brillouin（WKB）尺度的垂直动能的平均频谱具有Garrett-Munk模型（GM79）预测的水平，加上一个狭窄的M_2潮汐峰和一个宽的高频峰，其范围从大约0.1N到N，比GM79高出十年。高频峰在整个带宽上的能量随时间变化。它的能量与潮汐能无关。峰值之间的“连续”区域中的能量与高频峰值能量的水平弱相关，并且与潮汐峰值能量无关。垂直速度不是高斯的，而是高度间歇的，计算出的峰度为19。垂直动能在地理上变化。在近海和近岸发现低能。在小海山附近发现了最高的能量。在Heceta Bank的粗糙地形和架子断裂附近发现了高能量。最高能量以高频波的包的形式出现，通常出现在M_2内部潮汐的急剧下降阶段，被称为“潮汐溶解物”。还发现了一些具有高能量的孤立波。在垂直动能最高的1 h周期中，潮汐孤岩占31％，孤立波占8％，其余周期似乎是无组织的。详细检查了两种最活跃的潮汐溶解物。与无背景剪切的运动方程（即Dubreil-Jacotin-Long（DJL）方程）的稳态，传播，二维，无粘性内波解决方案相比，除观察到的最高能量外，所有波形均为对于它们的高度而言太窄而不能被孤立的波浪尽管垂直动能的峰值接近N，但M_2内部潮汐贡献了80％的能量，而忽略了近惯性波。潮汐独奏者对整个内部波能的贡献很小，为0.5％。

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