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111-5）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）现场观测，扩大现有的科学目标，包括一个建模组件，将利用一个模型？解析时间和空间场的能力，帮助解释数据。具体的新目标将是关注近惯性波群在大陆架断裂处被吸收或散射时的浅滩化和耗散。PI将利用研究区域，即波弗特海陆架和斜坡，季节性无冰的事实，探索冰盖变化可能通过产生效率的变化和冰下耗散的变化对内波能量水平产生的影响。模拟将与实地数据紧密联系起来，使用测量到的上层海洋海冰漂移和变形、洋流和遥感产品。特别是，该研究将解决以下新问题：1)观测到的从冰雪覆盖的海洋流出的向下的能量通量有多少到达大陆斜坡？2)测量到的入射能量通量是否在大陆架断裂处积累，这对北极几乎所有的内波都是至关重要的？3)这种能量积累是否足以解释深海波弗特海通风所需的隐含混合率？4)近惯性波在海底、冰下、开阔水域和临界斜坡反射下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?