Collaborative Research: The impact of irregular small-scale topography on large-scale circulation patterns

合作研究：不规则小尺度地形对大尺度环流格局的影响

• 批准号: 2241626
• 负责人: Xiaobiao Xu
• 金额: $ 36.17万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2241626&HistoricalAwards=false
• 关键词: Collaborative; Research; impact; irregular; small

This proposal addresses the role of rough bathymetry in generating small-scale eddies and submesoscale variability that interact with large scale currents. A combination of methods will be used in the project: analytical theories, high-resolution simulations, process-oriented models, and observations from satellite altimetry. A new multiscale closure parameterization for the HYCOM numerical model will be developed. The results will enhance understanding of fundamental physical processes controlling the interaction of oceanic flows with rough topography and improve numerical forecasts of the oceanic role in climate processes.This project addresses the need to develop explicit, accurate, and dynamically consistent parameterizations of the effects of submesoscale topography on larger scales of motion. Parameterizations of bottom roughness will be developed using an analytical method of multiscale asymptotic analysis. The methods to be used include analytical multiscale models, high-resolution simulations, implementation of the theory-based closure in HYCOM, and its validation by altimetry and roughness-resolving experiments. The numerical component includes simulations that explicitly resolve submesoscale variability of the bottom relief and their counterparts in which this variability is parameterized. The simulations range from relatively flexible process-oriented experiments to comprehensive general circulation models.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.

该建议探讨了粗糙的测深量法在产生与大规模电流相互作用的小规模涡流和子尺度变异性方面的作用。该方法将在项目中使用：分析理论，高分辨率模拟，面向过程的模型以及卫星高度学的观察结果。将开发HYCOM数值模型的新的多尺度封闭参数化。结果将增强对控制海洋流与粗糙形态相互作用的基本物理过程的理解，并改善在气候过程中海洋作用的数值预测。该项目解决了发展明确，准确和动态一致的参数的必要性，这些参数涉及对运动规模较大的运动量表的影响。底部粗糙度的参数化将使用多尺度渐近分析的分析方法开发。要使用的方法包括分析多尺度模型，高分辨率模拟，基于理论的闭合在HYCOM中的实现以及通过高度测定和解决粗糙度的实验验证。数值组件包括模拟，这些仿真可以明确解决底部浮雕的子尺度可变性及其对应物，其中该变异性被参数化。仿真范围从相对灵活的以过程为导向的实验到全面的一般循环模型。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。