Turbulent Dissipation Over the Continental Slope Off Vancouver Island

Turbulent Dissipation Over the Continental Slope Off Vancouver Island
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温哥华岛附近大陆坡上的湍流消散

DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
T. Osborn
T. Osborn
中科院分区：
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文献类型：
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作者：
R. Lueck;W. Crawford;T. Osborn

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1980年5月12日至14日，在温哥华岛外的大陆坡上，结合CTD和系泊流速仪的观测资料，制作了13条湍流动能粘滞耗散率的剖面。在垂直方向上观察到系统性变异，但在水平方向上没有观察到。在200米深度以上，可以看到许多盐稳定的温度逆温，耗散率显着大于低于200米。低于200米的耗散率是有史以来最低的报告，并符合目前的仪表系泊揭示的能量低水平。与Garrett-Munk内波谱的比较表明，在200 m以下的深度，内波能量的e折叠衰减时间为1.50天。
Abstract Thirteen profiles of the rate of viscous dissipation of turbulent kinetic energy &epsi¯ were made over the continental slope off Vancouver Island between 12 and 14 May 1980 in conjunction with CTD and moored current-meter observations. Systematic variability was observed in the vertical but not in the horizontal direction. Above 200 m depth numerous salt-stabilized temperature inversions were seen and dissipation rates were significantly larger than below 200 m. Dissipation rates below 200 m are the lowest ever reported and coincide with a low level of energetics revealed by the current meter moorings. Comparison with the Garrett-Munk internal wave spectrum indicates an e-folding decay time of internal wave energy of ∼50 days at depths below 200 m.