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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An assessment of local coastal dynamics observed with high-frequency radar
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An assessment of local coastal dynamics observed with high-frequency radar

机译：高频雷达观测到的当地沿海动力学评估

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An assessment is made of the dominant processes governing the circulation in a 30 km by 40 km area off the coast of Cape Hatteras, North Carolina, where surface current velocity vectors have been obtained using shore-based high-frequency radars in the High Resolution Remote Sensing experiment in 1993. Although the currents in this region are constantly under the influence of winds and tides, frequent intrusion of energetic flows into the area, apparently mostly of Gulf Stream origin, is shown to have a strong influence on the current variability. Analysis of vorticity and divergence shows that the flow intruding into the area is strongly rotational with positive vorticity. This rotational motion is not in geostrophic balance with the surface pressure gradient, and an inertial oscillation is often excited as a result, with vorticity and divergence oscillating 90 degrees out of phase. On average the geostrophic imbalance generates a net surface flow divergence, which, in turn, induces negative vorticity that more than offsets the positive vorticity advected into the region. However, vertical viscous transfer of positive vorticity from subsurface to surface is shown to be required to complete the surface vorticity balance; the same energetic cyclonic shear flows that intrude into the area are suggested as the source of the subsurface vorticity as these flows of Gulf Stream origin are known to be subducted under buoyant shelf water. [References: 17]
机译：对北卡罗来纳州哈特拉斯角沿海30 km x 40 km区域内支配环流的主要过程进行了评估，在高分辨率遥测中使用岸基高频雷达获得了表面流速矢量1993年的传感实验。尽管该地区的水流一直受到风浪的影响，但高能流频繁侵入该地区（显然主要是墨西哥湾流的起源）对水流的变化影响很大。对涡度和发散度的分析表明，进入该区域的水流是强烈旋转的，具有正涡度。这种旋转运动与表面压力梯度之间在地转方面不平衡，因此通常会激发惯性振荡，其中涡旋和发散会异相振荡90度。平均而言，地转不平衡会产生净表面流散度，进而引起负涡旋，而负涡旋将远远抵消平移到该区域的正涡旋。但是，为了完成表面涡度平衡，需要将正涡度从地下垂直转移到表面，这是必需的。建议将与该区域相同的高能气旋切变流作为地下涡旋的源头，因为已知湾流起源的这些流在浮性架子水之下被俯冲。 [参考：17]

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