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

这一建议解决了粗略的水深测量在产生与大尺度洋流相互作用的小尺度漩涡和亚中尺度变化中的作用。该项目将使用多种方法：分析理论、高分辨率模拟、过程导向模型和卫星测高观测。提出了一种新的HYCOM数值模型的多尺度闭包参数化方法。这些结果将加强对控制海洋流动与粗糙地形相互作用的基本物理过程的理解，并改进海洋在气候过程中作用的数值预报。该项目解决了发展亚中尺度地形对更大尺度运动影响的明确、准确和动态一致的参数化的需要。将使用多尺度渐近分析的解析方法来发展底部粗糙度的参数化。采用的方法包括分析多尺度模型、高分辨率模拟、HYCOM中基于理论的闭合实现以及通过测高和粗糙度分辨实验对其进行验证。数值部分包括明确解析底部起伏的亚中尺度变率的模拟，以及将这种变率参数化的对应模拟。模拟范围从相对灵活的过程导向实验到综合的大气环流模式。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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.