太平洋深海因其巨大的热量和碳存储能力、较长的水团停留时间在全球气候变化中扮演着重要角色。西太平洋是全球海洋地形最为复杂、潮能耗散最强的海区之一，是开展复杂地形对深海动力过程和气候系统影响研究的理想区域。本项目将基于中科院西太平洋现场观测数据、卫星遥感和历史观测数据、再分析数据等，研究显著受地形影响的深海地形波动、内潮和近惯性内波、湍流混合的特征、变异规律和其控制机制；重点探究参数次谐波不稳定机制和高模态内波不稳定机制在内潮、近惯性内波和湍流之间能量传递中的作用，重点探究背景流的不稳定机制和剪切不稳定机制在深层环流、地形波动、湍流之间能量传递中的作用，完善或修正上述机制在深海的适用性；揭示深海与局地和远程上层海洋的快慢联系通道，厘清相关控制过程的时间尺度，阐明深海对短期和中长期气候变化（特别是全球变暖）的响应。

Enormous volume and storage of heat and carbon, and long residence time makes the Pacific deep ocean important in the study of climate change. The Western Pacific Ocean is one of the most complex topography and strong tidal energy dissipation regions in the world, and thus it is an ideal experiment region for studying the effects of rough topography on deep ocean dynamics and climate system. Based on a combination of datasets obtained from in situ measurements made by the Chinese Academy of Sciences, remote sensing and historical measurements, and global ocean reanalysis products, this project aims to illustrate 1) the structure, variability, and mechanism of multi-scale dynamic processes in the deep ocean; 2) the important roles of the Parametric Subharmonic Instability and high-mode internal wave instability on energy cascade evolution among internal tides, near-inertial internal waves, and turbulence, and the important roles of background circulation instability and velocity shear instability on energy cascade evolution among deep ocean circulations, topographic waves, and turbulence; and 3) the fast and slow connections of deep ocean with local and remote upper ocean, and the response of deep ocean to the climate change.