南海北部深层环流时空结构及其变异机理

The deep circulation in northern South China Sea (SCS) is the key link connecting deep circulation in the Luzon Strait and central and southern SCS. It plays a significant role sustaining the thermal and freshwater balance of the SCS, the South China Sea Throughflow, the Indonesian Throughflow, as well as the sedimentary processes and marine hydrocarbon accumulation processes of the SCS. However, understanding of the deep circulation in northern SCS is too limited. Based on observation and general circulation model, this project is aimed at presenting its spatial structure and temporal variability, developing its numerical simulation, clarifying its driving mechanism. Besides, the regulation on the deep circulation of multi-scale dynamic processes, including mixing, internal waves, and mesoscale eddy, will also be studied. This project will promote the understanding of deep circulation in the Pacific and SCS and increase our strength in studying deep ocean.

南海北部深层环流是连接吕宋海峡深层流及南海中南部深层环流的关键环节，是维持南海热量和淡水平衡，支撑南海贯通流，调节印度尼西亚贯通流，影响南海海盆沉积过程、海相成藏过程、水体循环周期及深海碳循环的关键因子。然而到目前对南海北部深层环流认识极为有限。本项目拟基于现场观测资料及环流数值模式，阐明南海北部深层环流空间结构及时间变异规律，发展南海北部深层环流数值模式，明确南海北部深层环流驱动机制，揭示混合、内波及中尺度涡等多尺度动力过程对南海北部深层环流流量及水体性质的影响，加深对太平洋及南海深层环流的了解，提升我国在深海研究领域的国际地位，加快我国海洋科学研究从近海走向深远海的步伐。

南海北部深层环流是连接吕宋海峡深层流及南海中南部深层环流的关键环节，是维持南海热量和淡水平衡，支撑南海贯通流，调节印度尼西亚贯通流，影响南海海盆沉积过程、海相成藏过程、水体循环周期及深海碳循环的关键因子。然而到目前对南海北部深层环流认识极为有限。因此，本项目针对上述现状，开展了南海北部深层环流时空特征及调控机理观测研究及数值模拟，揭示了吕宋海峡深层流的年际变化特征，刻画了南海北部深层环流的时空特征，观测到了南海深层西边界流，基于高分辨率数值模式探讨了混合、地形等因素对南海深层环流的调控作用，并围绕内波、中尺度涡等多尺度过程对深层环流的影响开展了研究。上述研究工作的开展与系列研究成果的取得将提升对于南海深层环流及多尺度动力过程的机理认知。