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

冬季黑海内波反射和混合的研究

• 批准号: 0220686
• 负责人: Michael Gregg
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0220686&HistoricalAwards=false
• 关键词: Study; Internal; Wave; Reflection; Mixing

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.

0220686 Gregg 观察表明深海湍流与湖泊和峡湾的湍流之间存在质的差异。 黑海可能代表一种中间情况。 提出了一项研究来表征这片没有强潮汐流的大海中的湍流环境。 将在斜坡上植入声学多普勒电流剖面仪（ADCP），并在黑海内部释放拉格朗日浮标，以定义一系列微观结构测量的背景。 微结构探针滴和深度循环电导率-温度深度记录仪将在这些周围部署，以：1）量化在没有潮汐污染的环境中斜坡处内波散射产生的混合，2）测量和参数化黑海上部300 m的二密度扩散率，以及3）确定缺氧/好氧界面处的二密度扩散率，当 随行的化学家正在进行测量以了解相关反应。 （这些过程的时间尺度很短，并且对模型中的二重扩散率的选择似乎很敏感。）还将做出一些努力来控制三维效应。 现场工作将在充满活力的冬季进行。 与正在进行的太平洋实地计划 EPIC2001 的协同作用将增进对高分层区域的了解。季节性变化问题将通过保留 ADCP 并与 Steve Riser 合作来解决，Steve Riser 拥有 ONR 资金，可在黑海部署剖面浮标。