Collaborative Research: The Dynamics of Near-Surface Velocity Structure in the Coastal Ocean from Observations and Models

合作研究：通过观测和模型研究沿海海洋近地表速度结构的动力学

• 批准号: 2219669
• 负责人: Gregory Gerbi
• 金额: $ 29.69万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219669&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamics; Near; Surface

This study will concentrate on elucidating the processes that influence the top part of the water column, from about 10 m depth to the air-water interface. This layer is unresolved by different techniques that are used to measure ocean’s near-surface currents. For example, high-frequency radars resolve the skin of the water column but provides no information underneath. On the other hand, current velocity profilers tend to miss the portion of the water column right underneath the surface. This study will attempt to fill in the gap with the help of a numerical model that resolves the hydrodynamics of the upper-ocean layer and that considers the effects of surface waves. The study will also investigate the influence on surface currents of different water densities within the surface layer. The initial proposition is that wave action will tend to homogenize the vertical distribution of near-surface currents. The project will support one graduate student and undergraduate research opportunities at University of Maine, and will develop outreach activities with US Coast Guard Academy cadets.The proposal will study the dynamics of flows in the upper meters of the coastal ocean, including the influence of surface gravity waves and the modification to the dynamics by stratification and buoyancy fluxes. This portion of the water column is rarely observed and limited to short periods, which makes it difficult to distinguish the effects of winds and waves on water velocity profiles. The approach of the study will be to pair existing HF-radar measurements with upward-looking current profilers, and compare the velocity profiles to 1D numerical model (GOTM) results with distinct turbulence parametrizations and vertical stratification. The PIs propose that wave breaking and Langmuir turbulence will tend to homogenize vertical gradients in the velocity profile, together with an Eulerian flow related to the Stokes-Coriolis mechanism. In terms of BI, beyond the scientific merit, the proposal would provide parametrizations of near-surface processes driven by waves in models and for particle trajectory studies. The study would support a graduate student and undergraduate research opportunities at University of Maine, and will develop outreach activities with USCG Academy cadets.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究将集中于阐明影响水柱顶部的过程，从约10 m的深度到空气水界面。该层未通过用于测量海洋近表面电流的不同技术来解决。例如，高频雷达解决了水柱的皮肤，但下面没有提供任何信息。另一方面，当前的速度介质往往会错过地表下方水柱的一部分。这项研究将试图借助分辨上层层的流体动力学的数值模型来填补空白，并考虑表面波的影响。该研究还将研究表面层内不同水密度的表面电流的影响。最初的建议是，波动将倾向于使近表面电流的垂直分布均匀。该项目将支持缅因州大学的一名研究生和本科研究机会，并将与美国海岸警卫队学院的学员一起开展外展活动。该提案将研究沿海海洋上部仪表中流动的动态动力学，包括地表重力波的影响以及通过分层和繁殖性磁通量对表面重力的影响。很少观察到水柱的这一部分，并且仅限于短期，这使得很难区分风和波对水速度曲线的影响。该研究的方法是将现有的HF-radar测量值与外观外观的电流曲线相结合，并将速度曲线与1D数值模型（GOTM）结果进行比较，并将其与不同的湍流参数和垂直分层进行比较。 PIS的建议是，波浪破裂和Langmuir湍流将倾向于在速度曲线中均匀地均匀，以及与Stokes-Coriolis机制相关的Eulerian流动。就BI而言，除了科学功绩之外，该建议还将提供由模型和粒子轨迹研究驱动的近地表过程的参数。该研究将支持缅因州大学的研究生和本科研究机会，并将与USCG Academy Cadets开展外展活动。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛影响的评估来审查标准，被认为是宝贵的支持。