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

0220686格雷格观测表明，深海湍流与湖泊和峡湾中的湍流之间存在着质的差异。 黑海可能代表一种中间的情况。 提出了一项研究，以表征湍流环境，在这个大的海洋，这是没有强潮汐流。 一个声学多普勒海流剖面仪（ADCP）将被植入的斜坡和拉格朗日浮子释放在黑海的内部，以确定一系列的微观结构测量的背景。 微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：1）量化混合产生的内波散射在斜坡的环境中，潮汐污染是不存在的，2）测量和参数化的diapycnal扩散率在黑海的上部300米，和3）确定diapycnal扩散率在缺氧/好氧界面，当陪同的化学家正在进行测量，以了解相关的反应。 (The过程具有短的时间尺度，并且对模型中的横扩散系数的选择显得敏感。） 还将努力控制三维效果。 野外工作将在充满活力的冬季进行。 与EPIC 2001（一个正在太平洋进行的实地项目）的协同作用将提高对高分层区域的认识。季节性变化将通过留下ADCP并与Steve Riser合作来解决，Steve Riser拥有ONR资金在黑海部署剖面浮标。

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.