Study of Internal Wave Reflection and Mixing in the Black Sea during Winter

[0220686] gregg的观测表明，深海湍流与湖泊和峡湾湍流存在着质的区别。黑海可能是一个中间地带。本文提出了在这片没有强潮汐流的大海域进行湍流环境表征的研究。一个声学多普勒电流分析器（ADCP）将被植入斜坡上，一个拉格朗日浮子将被释放到黑海内部，以确定一系列微观结构测量的背景。微观结构探针滴和深度循环电导率-温度-深度记录仪将部署在这些周围，以：1)量化在没有潮汐污染的环境中斜坡上的内波散射产生的混合，2)测量并参数化黑海300米以上的底环扩散率，以及3)在陪同化学家进行测量以了解相关反应时，确定缺氧/缺氧界面的底环扩散率。（这些过程具有较短的时间尺度，并且对模型中周期扩散率的选择很敏感。）我们还将努力控制三维效果。野外工作将在精力充沛的冬季进行。与太平洋正在进行的现场项目EPIC2001的协同作用将提高对高分层区域的了解。季节性变化将通过保留ADCP并与Steve Riser合作来解决，Steve Riser拥有ONR资金，可以在黑海部署分析浮标。

0220686 GreggObservations suggest there exists a qualitative difference between deep ocean turbulence and turbulence in lakes and fjords. The Black Sea may represent an intermediate situation. A study to characterize the turbulence environment in this large sea, which is devoid of strong tidal flows, is proposed. An acoustic Doppler current profiler (ADCP) will be implanted on the slope and a Lagrangian float released in the interior of the Black Sea to define the context of a series of microstructure measurements. Microstructure probe drops and a depth-cycling conductivity-temperature-depth recorder will be deployed around these to:1) quantify mixing produce by internal wave scattering at the slope in an environment where tide contamination is absent, 2) measure and parameterize the diapycnal diffusivity in the upper 300 m of the Black Sea, and 3) determine diapycnal diffusivity at the anoxic/oxic interface, when accompanying chemists are taking measurements to understand the associated reactions. (The processes have short time scales and appear sensitive to the choice of diapycnal diffusivity in models.) Some effort will also be made to control for three-dimensional effects. Field work will occur during the energetic winter season. Synergy with EPIC2001, an ongoing field program in the Pacific Ocean, will improve understanding of high stratification regions. Seasonal variability will be addressed by leaving the ADCP in place and collaborating with Steve Riser, who has ONR funding to deploy profiling floats in the Black Sea.