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

沿海海洋中内潮汐与亚惯性风力强迫流相互作用的模拟

• 批准号: 1061078
• 负责人: Alexander Kurapov
• 金额: $ 7.34万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-15 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1061078&HistoricalAwards=false
• 关键词: Modeling; Internal; Tides; Interaction; Sub

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.

拟议的研究重点是模拟和动态分析的货架过程中产生的内部潮汐和风迫使海洋流动的联合行动和相互作用，夏季上升流制度的俄勒冈州货架上的应用。将实施自由表面、原始方程区域海洋模拟系统，同时强制潮汐和风应力。模型研究结果将通过分析来自沿海高频雷达和系泊设备的时间序列数据得到证实，其中包括来自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）计划的数据。这项研究将提供新的定性和定量信息的风驱动的流量和内部潮汐，相关的俄勒冈州大陆架和更普遍的沿海环境。要探讨的关键问题将包括（一）与上升流相关的亚惯性风强迫密度和电流变化的影响，对内潮的产生，传播和消散，包括半日和全日（二）定量了解内潮的不稳定性和空间变异性，以及（三）潮汐的重要性，以增强湍流，混合，阻力，并影响跨海岸运输。模型结果将有助于确定沿着俄勒冈州海岸的内潮增强区域，可能指导未来观测任务的设计。该项目是朝着开发一个全面的沿海模型迈出的重要一步，该模型准确地代表了低频风和密度驱动的水流以及高频潮汐水流。这种建模能力将对广大海洋学家非常有用，为（a）研究物理学、化学和生物学以及沿海海洋中跨学科的相互作用，（B）驱动描述大陆架生物变异性的模型，以及（c）规划新的观测方案提供了一种工具。将促进模拟和观测海洋学界之间的讨论和合作，以实现互利。新的建模和同化技术将被整合到沿着美国海岸的运行观测系统中，服务于广泛的公共需求（国家安全、污染传输、搜索和救援、渔业、娱乐、教育）。该项目支持的研究生将接受培训，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。