The propagation and breaking of topographically generated internal waves in the ocean

海洋中地形产生的内波的传播和破碎

• 批准号: 0854131
• 负责人: Julie Crockett
• 金额: $ 16万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0854131&HistoricalAwards=false
• 关键词: propagation; breaking; topographically; generated; internal

0854131VanderhoffThe topographic generation, propagation and breaking of oceanic internal waves is an essential part of the ocean mixing processes that contribute to the general circulation of the ocean, the exchange of heat and gasses with the atmosphere, and the dispersal of pollutants and nutrients. This project aims to develop modeling tools, perform simulations and compare with observational data to understand the dynamics of the topographic generation of internal waves in the ocean, how these waves propagate through a realistic ocean environment with vertically varying density and shear, gain additional insight into the subtle processes of how these short internal waves evolve toward breaking and dissipation, and how to quantify and parameterize the dissipation and mixing effects of breaking. The primary methods used will be recently developed hybrid ray-tracing techniques that allow the efficient calculation of the propagation of internal waves through a realistic ocean environment, including the calculation of wave amplitudes, and that eliminate or minimize the need for corrections at ray singularities. The simulations will be closely coordinated with ocean observations, specifically with data obtained during the NSF-sponsored Hawaiian Ocean Mixing Experiment, of the generation of internal waves by ocean bottom topography and their subsequent propagation. This investigation will allow for funding and training of graduate and undergraduate students in the concepts and practice of oceanography, internal wave theory, ray methods, data analysis and large-scale numerical simulation techniques.

[04:54 . 131]万德霍夫海洋内波的地形产生、传播和破碎是海洋混合过程的重要组成部分，海洋混合过程有助于海洋的总体环流、与大气的热量和气体交换以及污染物和营养物质的扩散。该项目旨在开发建模工具，进行模拟并与观测数据进行比较，以了解海洋中内波的地形生成动力学，这些波如何在具有垂直变化密度和切变的现实海洋环境中传播，并进一步了解这些短内波如何演变成破碎和消散的微妙过程。以及如何量化和参数化破碎的耗散和混合效应。使用的主要方法将是最近开发的混合射线追踪技术，这种技术可以有效地计算内波在现实海洋环境中的传播，包括波幅值的计算，并消除或尽量减少对射线奇点的修正需求。模拟将与海洋观测密切协调，特别是与在美国国家科学基金会赞助的夏威夷海洋混合实验中获得的数据，即海底地形产生的内波及其随后的传播。这项调查将允许资助和培训研究生和本科生海洋学的概念和实践，内波理论，射线方法，数据分析和大规模数值模拟技术。