Collaborative Research: The Interactions Between Internal Waves, Mesoscale eddies, and Submesoscale Currents in the California Current System

合作研究：加州洋流系统中内波、中尺度涡流和次中尺度洋流之间的相互作用

• 批准号: 1851397
• 负责人: Maarten Buijsman
• 金额: $ 12.92万
• 依托单位: University of Southern Mississippi
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1851397&HistoricalAwards=false
• 关键词: Collaborative; Research; Interactions; Between; Internal

This study will examine the role of the interactions and energy exchanges between mesoscale eddies, submesoscale currents, and near-inertial and tidal internal waves (IWs) in determining global dissipation and mixing patterns in the ocean. The focus of the research is on the fundamental physics that governs the interactions, with specific applications to the California Current System. The California Current System is an eddy-rich eastern boundary upwelling region where energetic near inertial waves (NIWs) and tidal IWs (internal tides) have been previously observed and that will likely be used for NASA's Surface Water & Ocean Topography (SWOT) calibration and validation experiment. The approach will be to conduct a hierarchy of idealized and realistic state of the art numerical simulations in conjecture with in situ mooring observations for testing the realism of the models. The analysis will be based on numerical experiments of variable resolutions that systematically include and exclude tides and wind-forced NIWs. The PIs will engage in standard avenues for scientific communication, namely papers, seminars and presentations at society meetings. In addition, the proposed work will promote the career development of an early career scientist and support one postdoc, one PhD student and one MS student. The project will also support two summers of undergraduate research and the travel to the Coastal Ocean Environment Summer School in Ghana (coessing.org). This school, founded by one of the project team members, provides an opportunity for students from African countries to learn about oceanography.The general circulation of the ocean is strongly constrained by the pathways that kinetic and available potential energy take from the basin-scale forces that inject them to centimeter scales, where they are depleted. To determine the ocean's response to future climate scenarios, these energetic pathways, from forcing to dissipation, must be understood and quantified. Previous studies have established the importance of mesoscale and submesoscale circulations to the kinetic energy route to dissipation, and of near-inertial and tidal IWs to the available-potential energy route to mixing, but a comprehensive study of the coupling between the two routes and the role of the eddy-wave interactions has not been carried out. Here the realistic simulations together with idealized simulations that will methodically investigate the interactions under variable stratification, rotation, and forcing magnitudes, will greatly advance the understanding of present and future oceanic energy distributions. The work will advance current understanding of ocean energetics, and will guide the development of diffusive parameterizations that take into account the combined spatiotermporal contributions of the different phenomena to energy mixing and dissipation. These parameterizations can be implemented in climate models and improve climate projections. In addition, this work will greatly ameliorate the interpretability of present and future satellite sea-surface height observations, whose analysis will be complicated by incoherent internal wave signals.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.

这项研究将研究中尺度涡流，子尺度电流以及近乎惯性和潮汐内波（IWS）之间的相互作用和能量交流在确定海洋中的全局耗散和混合模式中的作用。这项研究的重点是控制相互作用的基本物理学，并在加利福尼亚当前系统中采用了特定的应用。加利福尼亚电流系统是一个以前已经观察到的惯性波（NIW）和潮汐IWS（NIWS）和潮汐IWS（内部潮汐）的涡流富裕的东部边界上升区域，并且可能会用于NASA的地表水和海洋特形（SWOT）校准和验证实验。该方法将是根据原位系泊观测值来实现理想化和现实状态的理想化和现实状态的层次结构，以测试模型的现实主义。该分析将基于系统地包括和排除潮汐和风力的NIW的可变分辨率的数值实验。 PIS将在社会会议上进行科学交流的标准途径，即论文，研讨会和演讲。此外，拟议的工作将促进早期职业科学家的职业发展，并支持一位博士后，一名博士生和一名MS学生。该项目还将支持两个夏季的本科研究和前往加纳沿海海洋环境夏季学校的旅行（coessing.org）。这所由项目团队成员之一创立的这所学校为来自非洲国家的学生提供了一个了解海洋学的机会。海洋的一般循环受到动力学和可用潜在能源的途径的强烈限制，即从盆地规模的力量中，将它们注射到厘米尺度，在哪里耗尽。为了确定海洋对未来气候情景的反应，必须理解和量化这些充满活力的途径，从强迫到耗散。先前的研究已经确定了中尺度和子尺度循环的重要性，即耗散的动能途径，以及近乎惯性和潮汐IWS与可用的混合能量能量途径的近乎惯性和潮汐途径，但是对两种路线的耦合以及Eddy-Wave相互作用的作用的全面研究尚未实现。在这里，现实的模拟以及理想化的模拟将有条不紊地研究可变分层，旋转和迫使大小的相互作用，将大大提高人们对当前和未来的海洋能量分布的理解。这项工作将提高人们对海洋能量学的当前理解，并指导扩散参数化的发展，这些参数考虑了不同现象对能量混合和耗散的时空贡献的综合贡献。这些参数化可以在气候模型中实现并改善气候预测。此外，这项工作将极大地改善当前和未来的卫星海面高度测量的解释性，其分析将因不连贯的内部波浪信号而复杂化。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的审查标准来通过评估来获得支持的。