AI 中文总结
本研究通过地中海深海系泊观测，分析中尺度涡与内波相互作用下的倾斜度变化，发现相对涡度达惯性频率量级时倾斜度异常增大，将变化尺度缩至9.5米，微小流速变化即可产生显著湍流混合。
AI 中文摘要
能量丰富的中尺度涡与内波之间的相互作用可引发对流湍流产生，这对深海生物和环流可能具有重要意义，但相互作用流的尺度大小尚不明确。本文在西北地中海2500米深的平坦海底上方，对水平间距9.5米的40根系泊线的单个顶部浮标附近的倾斜度诊断工具进行测试，并与50米尺度的相对涡度和水流进行对比。尽管倾斜度与系泊线阻力引起的流速平方呈一阶相关，但当相对涡度振幅达到O(f)（f为行星涡度的惯性频率）时，会出现与该关系的显著偏差和更大的倾斜度，且相对涡度的符号无关紧要。这类大倾斜事件发生在最强烈的对流湍流期间，表现为上方暖水倾斜下沉，此时倾斜角大小的变化可达平均倾斜度O(0.1)度，从而将变化尺度从50米缩小至9.5米。因此，在流速小于0.07米每秒的深海环境中，O(0.01)米每秒的流速变化即可产生重要的湍流混合，且无需形成深层高密度水。
英文摘要
Interaction between energy-abundant mesoscale eddies and internal waves can lead to convection-turbulence generation and may prove important for deep-sea life and circulation. However, the size of scales of interacting flows is not well known. In this paper, a diagnostic tool of tilt is tested near the single top-buoyancy of 40 mooring lines 9.5 m apart horizontally and compared with 50-m scale relative vorticity and waterflow above a 2500-m deep flat Northwestern-Mediterranean seafloor. Whilst tilt relates to first order with flow-speed squared induced by mooring-line drag, considerable deviations from this relationship and larger tilt occur when the amplitude of relative vorticity attains values O(f), f the inertial frequency of planetary vorticity. The sign of relative vorticity is of no importance. Such larger-tilt events occur during most intense convection turbulence via warm-water slanting from above. During these events, variations in tilt-angle magnitude are as large as the average tilt O(0.1)degree, thereby reducing variational scales from 50 to 9.5 m. Thus, in a deep-sea environment where flow speeds are <0.07 m s^-1, O(0.01) m s^-1 flow-speed variations provide important turbulent mixing, without deep dense-water formation.
Comments32 pages, 13 figures
