Southern East China Sea Flow - Vortex Structure Analysis And The Dynamic Mechanism

The East China Sea is one of the most sensitive sea areas in the world oceans. Variations of circumfluence in East China Sea not only affect directly the climate of East Asia and China, but also control the transport of nutrients and the purification of pollutants. As the circumfluence of East China Sea is very important to the Chinese offing environments and Ocean Engineering, it is the main topic for Chinese ocean staffs.The south East China Sea that south of 31°N is the densest area of hydrological survey. Over 8 000 000 temperature and salinity survey stations and 12 000 000 velocity survey stations have been accumulated until now, and these data provide substantial basis for physical oceanography research work in this area. In this thesis, based on abundant observational data, assisted with the MASNUM wave-tide-current coupled model, with data analysis, modeling validation and dynamic mechanism explanation, the circumfluence and vortex structure will be studied.There are several contents in this thesis. They are the current structure of Kuroshio in East China Sea and its temporal variations, Kuroshio branches and its relationship with sea temperature distributions, the seasonal characters of the counter-current on the right side of the Kuroshio, the verification of the counter-current on the left side of the Kuroshio, the Kuroshio circumfluence subsystem in East China Sea, the route and flux of flows in the Taiwan Straight, the water sources and paths of Taiwan Warm Current, seasonal distributions of vortexes and warm (cold) water centers.