Collaborative Research: Internal Waves and Mixing on the Near-Critical Oregon Continental SlopeNear-Critical Oregon Continental Slope

合作研究：近临界俄勒冈大陆坡上的内波和混合Near-Critical Oregon Continental Slope

• 批准号: 0350647
• 负责人: Matthew Alford
• 金额: $ 96.35万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350647&HistoricalAwards=false
• 关键词: Collaborative; Research; Internal; Waves; Mixing

ABSTRACTOCE-0350647Breaking of shoaling internal waves is a likely cause for the enhanced mixing observed above continental slopes. The PI's will deploy moored profilers and use ship-based instruments to examine the internal wave climate and energy budget on the Oregon continental slope. Particular attention will be paid to the low-mode internal wave energy-flux impinging onto the slope from the deep ocean, its interaction with cross-isobath topography, and the relationship between cross-isobath energy-flux convergence and turbulent energy dissipation/mixing. This approach allows quantification of an energy budget between incoming and outgoing internal waves, and the turbulent sink. Based on the physical characteristics of the area and on earlier work on the Virginia continental slope, it is expected that the energetics will be dominated by incident low-mode internal tides being critically reflected to high wavenumbers, with consequent elevated losses to turbulence. Sampling will capture the impinging low-mode energy flux and the reflected/scattered low and high wavenumbers. The Turbulent dissipation and mixing will be measured from overturning scales and inferred from finescale parameterizations which showed skill on the Virginia continental slope and on the flanks of the Hawaiian Ridge. The results of this research will contribute to better understanding of the sinks for internal waves generated in the deep ocean and the role of elevated turbulence on the continental slope in abyssal mixing.Broader Impacts: Where and how mixing and turbulent dissipation takes place are long-standing and fundamental questions with far-reaching implications for large scale ocean circulation. The results of this research will contribute to better understanding of these areas. In addition this project will also integrate ocean waves into pre-college classrooms through existing programs at K-6 and high-school levels. At least one female graduate student will participate in the research cruise.

浅滩内波的破裂可能是大陆斜坡上观测到的混合增强的一个原因。PI将部署系泊剖面仪，并使用船载仪器来检查俄勒冈大陆斜坡的内波气候和能量收支。重点研究了来自深海的撞击坡面的低模态内波能量通量及其与跨等深线地形的相互作用，以及跨等深线能量通量辐合与湍流能量耗散/混合的关系。这种方法可以量化输入和输出的内波之间的能量收支，以及湍流汇。根据该地区的物理特征和对弗吉尼亚大陆斜坡的早期工作，预计能量学将由入射的低模态内部潮汐主导，这些潮汐被严格地反射到高波数，因此湍流损失增加。采样将捕获撞击的低模式能量通量和反射/散射的低波数和高波数。紊流耗散和混合将从倾覆尺度测量，并从精细尺度参数化中推断，这些参数化显示了弗吉尼亚大陆斜坡和夏威夷山脊两侧的技巧。本研究的结果将有助于更好地理解深海产生的内波的汇，以及大陆坡上湍流升高在深海混合中的作用。更广泛的影响：混合和湍流耗散在哪里以及如何发生是长期存在的基本问题，对大尺度海洋环流具有深远的影响。这项研究的结果将有助于更好地理解这些领域。此外，该项目还将通过现有的K-6和高中课程将海浪融入大学前的课堂。至少有一名女研究生将参加研究巡航。