次中尺度涡与Langmuir环流相互作用大涡模拟

海洋次中尺度过程在整个海洋系统中的混合耗散、能量再分配中具有非常重要的作用，是目前国际物理海洋界的研究热点。准确了解其产生机制和演变规律，对海洋动力学研究、海洋模式改进和发展等具有重要意义。利用LES开展次中尺度研究是非常有效的研究手段，能够很好的揭示次中尺度发生的详细过程，为次中尺度过程在能量转移和耗散研究提供优先方法。同时小尺度湍流过程影响着海洋混合层中动量、能量和物质交换，在上层海洋的混合和动力学中起着重要作用。本项目旨在研究次中尺度与小尺度过程的相互作用，因此根据研究区域地形复杂和岛屿众多的特征，选取了次中尺度地形尾涡和Langmuir环流作为代表性物理过程。利用湍流大涡模拟方法研究次中尺度地形尾涡与Langmuir环流相互作用，以及二者对上层海洋混合和动力学结构的相对重要性，为模型数值模拟中次中尺度过程和小尺度过程参数化提供科学依据。

The ocean submesoscale processes play a very important role in the mixing dissipation, energy redistribution in the whole ocean system. Thus, it is one of the frontier scientific issues in Physical Oceanography. Accurate understanding of its generation and evolution mechanism has great significance on the ocean dynamics research, ocean model improvement and development. Large-eddy simulation (LES) is an extremely useful method to study submesoscale processes, which can reveal the detailed process of submesoscale and provide a priority for the study of energy transfer and dissipation in submesoscale processes. Turbulent processes at even smaller scales are also important in the mixing and dynamics of the upper ocean.They effectively affects the momentum, energy and material exchange in the ocean mixed layer.This project using large-eddy simulation to investigate the interaction between the submesoscale and the small-scale processes and the relative importance of the two to the oceanic mixing and dynamic structure. Based on the complicated terrain and numerous islands, submesoscale topographic wakes and Langmuir turbulence are selected as representative physical processes respectively. Based on these work, the relative effects of submesoscale processes and small-scale processes on the upper ocean are compared, which has important scientific significance on submesoscale and small-scale parameterization.