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的湍流之间存在质的差异。黑海可能代表着一种中间局势。提出了一项研究，以刻画这片没有强潮流的大片海域的湍流环境。将在斜坡上植入声学多普勒海流剖面仪(ADCP)，并在黑海内部释放拉格朗日浮标，以确定一系列微结构测量的背景。微结构探头液滴和深度循环电导率-温度-深度记录器将部署在这些周围：1)在没有潮汐污染的环境中，量化在斜坡上由内波散射产生的混合，2)测量黑海上部300米处的昼夜扩散系数并将其参数化，3)在伴随化学家采取测量以了解相关反应时，确定缺氧/氧气界面的昼夜扩散系数。(这些过程具有较短的时间尺度，并且对模式中日平均扩散系数的选择似乎很敏感。)还将做出一些努力来控制三维效果。野外工作将在精力充沛的冬季进行。与太平洋正在进行的实地项目EPIC2001的协同作用将增进对高层地区的了解。季节变化将通过让ADCP保持不变并与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.