吕宋海峡复杂地形调控下南海北部—西太平洋环流格局与水体交换研究

作为西太平洋“沟—弧—盆”体系的典型代表性海区，吕宋海峡附近海域伴随着西边界流、中尺度涡、亚中尺度过程、内波等多尺度海洋动力过程，其在复杂地形约束下共同构成了吕宋海峡附近的环流格局，并深刻影响着南海北部—西太平洋的水体和能量交换。本项目拟结合现场观测、遥感观测与数值模拟，较为系统地阐释吕宋海峡附近海区西太平洋中尺度涡/Rossby波与黑潮的相互作用机理；探讨涡旋与地形对吕宋海峡水体交换时空特征的调制作用；分析南海北部陆坡处海流、中尺度涡和内波对跨陆坡输运的贡献与作用机制。这些研究可望显著提升对吕宋海峡复杂地形调控下南海北部—西太平洋环流格局与水体交换的科学认识，并取得一些创新性成果，为破解重大研究计划研究方向（一）的核心科学问题做出贡献。本项目还将在观测技术上具有创新特色，自主研发带温盐链的漂流浮标，将为研究吕宋海峡水交换和南海跨陆坡输运等提供有用的数据。

As a representative area in the context of “trench-island arc-basin” system in the western Pacific, the Luzon Strait and its adjacent area is rich of multi-scale dynamical processes including the western boundary current, mesoscale eddies, submesoscale processes, internal waves, etc. Such processes, under the constraint of the above topographic features, form the local circulation patterns and exert a significant impact on the exchanges of water mass and energy between the northern South China Sea (SCS) and western Pacific. Based on in situ and satellite observations and numerical simulations, this project aims to systematically investigate (i) the interactions between mesoscale eddies/Rossby waves and the Kuroshio in the vicinity of the Luzon Strait, (ii) influence of mesoscale eddies and topography on modulating the spatiotemporal characteristics of water exchange near the Luzon Strait, and (iii) the respective contributions of currents, mesoscale eddies and internal waves to the cross-slope transport in the northern SCS. Better knowledge of the above aspects will significantly improve our understanding of the circulation patterns and water exchange in the topographically regulated Luzon Strait area. Some innovative outcomes are expected from the above research, which would contribute to the breakthroughs in the first orientation of the Major Research Plan. In addition, this project will also innovate in the marine observational technology by self-developing satellite-tracked drifters towed with chains that collect temperature and salinity data. Such type of drifters would undoubtedly provide invaluable in situ measurements for studies of water exchange in the Luzon Strait and cross-slope transport in the northern SCS.