Modeling of Internal Tides in Interaction with Sub-inertial Wind-Forced Flows in the Coastal Ocean

提出的研究重点是由内部潮汐和风强迫海洋流动的共同作用和相互作用引起的大陆架过程的建模和动力学分析，并应用于俄勒冈大陆架的夏季上升流状态。自由面原始方程区域海洋模拟系统（ROMS）将与潮汐和风应力同时进行。模型结果将通过沿海高频雷达和系泊的时间序列数据分析得到证实，包括来自美国国家科学基金会资助的沿海海洋大陆架运输进展（COAST）和全球海洋生态系统动力学（GLOBEC）项目的数据。知识价值。这项研究将提供关于风力驱动流和内部潮汐的新的定性和定量信息，这些信息与俄勒冈大陆架和更普遍的沿海环境有关。需要探索的关键问题将包括：(i)与上升流相关的亚惯性风迫密度和洋流变化对内部潮汐的产生、传播和耗散的影响，包括半日和日；（ii）对内部潮汐间歇性和空间变异性的定量理解；（iii）潮汐对增强湍流、混合、阻力和影响跨岸运输的重要性。模型结果将有助于确定俄勒冈海岸内部潮汐加剧的区域，可能指导未来观测任务的设计。更广泛的影响。该项目是朝着开发综合海岸模型迈出的重要一步，该模型可以准确地代表低频风和密度驱动流以及高频潮汐流。这样的建模能力将对海洋学家的广泛社区非常有用，为(a)研究物理、化学和生物学以及沿海海洋的跨学科互动提供工具，(b)驱动描述大陆架上生物变异的模型，以及(c)规划新的观测项目。将促进模拟和观测海洋学界之间的讨论和合作，以实现它们的共同利益。新的建模和同化技术将被整合到美国沿海的观测系统中，服务于广泛的公共需求（国家安全、污染运输、搜索和救援、渔业、娱乐、教育）。本项目支持的研究生将被培养成为使用最先进的方法和技术进行沿海海洋建模和数据同化的专家。

The proposed research focuses on modeling and dynamical analysis of shelf processes resulting from the combined action and interaction of internal tides and wind-forced ocean flows, with application to the summer upwelling regime on the Oregon shelf. The free-surface, primitive equation Regional Ocean Modeling System (ROMS) will be implemented, forced simultaneously with tides and wind stress. Model findings will be corroborated by the analysis of time-series data from coastally based high frequency radars and moorings, including the data from the NSF-funded Coastal Ocean Advances in Shelf Transport (COAST) and Global Ocean Ecosystem Dynamics (GLOBEC) programs.Intellectual merit. This study will provide new qualitative and quantitative information about both wind-driven flows and internal tides, relevant for the Oregon shelf and more generally for the coastal environment. Key issues to be explored will include (i) effects of sub-inertial wind-forced density and current variations associated with upwelling, on the generation, propagation, and dissipation of the internal tide, both semi-diurnal and diurnal (ii) quantitative understanding of internal tide intermittency and spatial variability, and (iii) importance of the tides for enhancing turbulence, mixing, drag, and affecting cross-shore transport. Model results will help identify areas of intensified internal tide along the Oregon coast, possibly guiding the design of future observational missions.Broader impacts. This project is an important step toward the development of a comprehensive coastal model that accurately represent both low frequency wind and density driven flows, and higher frequency tidal flows. Such a modeling capability will be very useful to the broad community of oceanographers, providing a tool for (a) studying physics, chemistry, and biology, and across discipline interactions in the coastal ocean, (b) driving models describing biological variability on the shelf, and (c) planning new observational programs. Discussions and collaborations between the modeling and observational oceanographic communities will be facilitated, for their mutual benefit. New modeling and assimilation technologies will be integrated into the operational observing systems along the U.S. coasts, serving broad public needs (national security, pollution transport, search and rescue, fisheries, recreation, education). The graduate student supported by this project will be trained to become an expert on coastal ocean modeling and data assimilation using state-of-the-art methods and technologies.