Near-inertial wave generation, propagation, and shoaling in a seasonally ice-covered ocean

该奖项是根据《2009年美国复苏和再投资法案》(公法第111-5条)资助的。PI建议利用正在进行的ICORTAS(冰盖海洋对大气风暴的响应)野外观测，方法是增强现有的科学目标，包括一个建模组件，该组件将利用一个模型--S解析时间和空间场的能力，帮助解释数据。具体的新目标将侧重于近惯性波群在大陆架断裂时被吸收或分散时的浅滩和消散。PI将利用研究区域--波弗特海陆架和斜坡--季节性不结冰的事实，探索不断变化的冰盖可能通过发电效率的变化和冰下消散的变化对内部波浪能量水平的影响。模拟将与现场数据紧密联系在一起，使用测量的上层海洋海冰漂移和变形、海流和遥感产品。特别是，这项研究将解决以下新问题：1)观测到的冰盖海洋向下的能量通量有多少到达大陆斜坡？2)测量到的传入能量通量是否在陆架断裂处积累，这对北极几乎所有的内波都是关键的？3)这种能量积累是否足以说明深海波弗特海通风所需的隐含混合率？4)受海底、冰下、开阔水域和临界斜坡反射影响的近惯性波的相对效率和阻尼率是多少？

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The PI proposes to leverage the ongoing ICORTAS (Ice-Covered Ocean Response to Atmospheric Storms) field observations by augmenting the existing scientific goals to include a modeling component that will capitalize on a model?s ability to resolve temporal and spatial fields, aiding in interpretation of the data. Specific new goals will be a focus on shoaling and dissipation of near-inertial wave groups as they are absorbed or scatter at the continental shelf break. The PI will use the fact that the study area, the Beaufort Sea shelf and slope, is seasonally ice-free to explore the impact that a changing ice cover may have on internal wave energy levels, both through changes in the efficiency of generation, and changes in under-ice dissipation. Simulations will be tightly linked to the field data, using measured upper ocean sea-ice drift and deformation, currents and remote sensing products. In particular, the study will address the following new questions:1) How much of the observed downward energy flux out of the ice-covered ocean reaches the continental slopes?2) Does the measured incoming energy flux accumulate at the shelf-break, which is critical to almost all internal waves in the Arctic?3) Is this energy accumulation sufficient to account for the implied mixing rates required to ventilate the abyssal Beaufort Sea?4) What are the relative efficiencies and damping rates of near-inertial waves subject to bottom, under-ice, open water, and critical slope reflections?