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首页> 外文期刊>Journal of oceanography >Observations of turbulence under weakly and highly stratified conditions in the Ariake Sea
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Observations of turbulence under weakly and highly stratified conditions in the Ariake Sea

机译：在有明海的弱高分层条件下的湍流观测

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摘要

Observations of turbulence, stratification, and mean current were made using a microstructure profiler and an acoustic Doppler current profiler (ADCP) during four cruises at a central location in the Ariake Sea, under weakly and strongly stratified conditions. Continuous measurements of the dissipation rate of turbulent kinetic energy (TKE), e, were made. These revealed that frictional bed turbulence with quarterdiurnal variation in the bottom boundary layer (BBL) was one of the most energetic sources of vertical mixing in the sea. Thickness of the BBL was strongly confined by the stable stratification. We investigate a relationship between the BBL height h and the Ozmidov scale. We present a systematic argument that describes the vertical structure and characteristic scales of velocity and turbulence inside the frictional BBL, where the stratification persisted. Considerable deviation of observed vertical shear from the law of the wall indicated a modification of turbulent scales by the stratification. Shear stress calculated from the velocity data using vertical integration of the equation of motion was found to decrease approximately linearly with height. The TKE production rate P, estimated using the shear stress, was highly correlated with the dissipation rate. The buoyancy contribution to TKE balance in the BBL was quantified in terms of the flux Richardson number R_f as R_f =0.12.
机译：在有分层和弱分层条件下，在有明海中心位置进行的四次航行中，使用微结构轮廓仪和声学多普勒电流轮廓仪（ADCP）对湍流，分层和平均电流进行了观测。连续测量了湍动能（TKE）的耗散率e。这些结果表明，底部边界层（BBL）的季度昼夜变化引起的摩擦床湍流是海洋垂直混合最活跃的来源之一。稳定的分层强烈限制了BBL的厚度。我们调查BBL高度h和Ozmidov规模之间的关系。我们提出了一个系统的论据，描述了摩擦BBL内分层持续存在的速度和湍流的垂直结构和特征尺度。观察到的垂直剪力与墙的定律有相当大的偏差，表明分层引起了湍流水垢的改变。发现使用运动方程的垂直积分从速度数据计算出的剪应力随高度近似线性减小。使用剪切应力估算的TKE生产率P与耗散率高度相关。 BBL中对TKE平衡的浮力贡献根据通量理查森数R_f量化为R_f = 0.12。

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