Internal bores and breaking internal tides on the Oregon continental slope
Internal bores and breaking internal tides on the Oregon continental slope
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DOI：
10.1175/jpo-d-12-030.1
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发表时间：
2013-01
影响因子：
3.5
通讯作者：
K. Martini;M. Alford;E. Kunze;S. Kelly;J. Nash
中科院分区：
文献类型：
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作者：
K. Martini;M. Alford;E. Kunze;S. Kelly;J. Nash
本文介绍了在俄勒冈州大陆坡沿沿着43°12′N布设5个系泊站40天期间的破裂内潮观测结果。远程生成的内潮浅滩上的斜坡，陡峭，打破，并形成湍流孔传播上坡独立的内潮。一个高分辨率的快照，一个单一的孔被捕获从降低声学多普勒海流剖面仪（LADCP）/CTD配置文件在25小时的时间序列在1200米。该孔是冷的，含盐的，超过100米高，并有一个湍流头，瞬时耗散率提高（e > 10−6 W kg−1）和沉积物再悬浮。在两个最深的斜坡系泊（1452和1780米），类似的钻孔现象观察近底高分辨率温度时间序列。平均耗散率和diapycnal扩散系数增加了2倍时，孔的存在（W kg−1和m s−1）和观测到的内潮是足够的能量来驱动这些增强的耗散率。在全球范围内，作者估计…
AbstractObservations of breaking internal tides on the Oregon continental slope during a 40-day deployment of 5 moorings along 43°12′N are presented. Remotely generated internal tides shoal onto the slope, steepen, break, and form turbulent bores that propagate upslope independently of the internal tide. A high-resolution snapshot of a single bore is captured from lowered acoustic Doppler current profilers (LADCP)/CTD profiles in a 25-h time series at 1200 m. The bore is cold, salty, over 100 m tall, and has a turbulent head where instantaneous dissipation rates are enhanced (e > 10−6 W kg−1) and sediment is resuspended. At the two deepest slope moorings (1452 and 1780 m), similar borelike phenomena are observed in near-bottom high-resolution temperature time series. Mean dissipation rates and diapycnal diffusivities increase by a factor of 2 when bores are present ( W kg−1 and m s−1) and observed internal tides are energetic enough to drive these enhanced dissipation rates. Globally, the authors estimate...