海洋中尺度涡与近惯性内波之间能量交换的机理及其对深海大洋跨等密度面湍流混合的影响

海洋中的能量串级过程对于维持海洋能量的收支平衡起着重要作用，是物理海洋学研究的热点问题，同时也是一个经典难题。尽管对于能量从大洋环流到中尺度涡以及从内波到湍流混合的串级过程已经有了较为清晰的认识，然而对于中尺度涡和内波尤其是近惯性内波之间的能量交换过程仍然缺乏深入的了解。因此，开展中尺度涡和近惯性内波能量交换的研究具有重要科学意义。.本项目基于高分辨率海洋环流模式和海洋观测数据，重点研究以下内容：（1）揭示中尺度涡与近惯性内波能量交换率在全球海洋的时空分布特征及影响因子；（2）探究海洋中尺度涡与近惯性内波之间能量交换的主要机理；（3）评估中尺度涡与近惯性内波能量交换在驱动深海大洋跨等密度面湍流混合中的作用。本项目的研究对于我们完善对整个海洋能量串级过程的认识，深入理解深海大洋跨等密度面湍流混合的能量来源，以及改进数值模式对气候系统的模拟能力具有重要的学术价值和现实意义。

Energy cascading process plays a key role in the energy balance of global ocean. It is one of the most important but also most challenging problems in physical oceanography. While the energy transfer from basin-scale ocean general circulation to mesoscale eddies and from internal gravity waves to turbulent mixing is relatively well documented, it remains poorly understood how the energy exchanges between mesoscale eddies and internal gravity waves (especially near-inertial internal waves). Therefore, studying their energy exchange has great scientific values..Based on oceanic in situ observations and numerical simulations obtained from high-resolution ocean general circulation models, this project is aimed to study the energy exchange between mesoscale eddies and near-inertial internal waves, with focuses on (1) revealing the spatial and temporal variations of energy exchange rate in the global ocean and its controlling factors, (2) exploring the major dynamical mechanisms responsible for the energy exchange, and (3) evaluating the role of energy exchange in furnishing the diapycnal mixing in the deep ocean. The progress made by this project will provide us a better knowledge of the entire energy cascading process and energy sources for maintaining the diapycnal mixing in the deep ocean as well as improve the model representation and prediction of climate.