Characteristics of Water Type Distribution and Seasonal Variations in the Southern East China Sea

摘要

By using the data of Summer and Winter 1987, Spring and Autumn 1988 obtained by the R/V" Tijuana" during the China-Japan Joint Research Program on uroshio, the paper makes an analysis and research on the water type distribution and its variations in t he studied sea area. The results of which are mainly as follows: (1) The Class IV mixing water whose property is similar to that of the continental coastal water is located in the northeast sea area, along the coast of the continent in autumn and winter while extending to the open sea in spring and summer. (2) The boundary between the Kuroshio water and the shelf mixing water (called the left boundary of the Kosho water) is approximately located in between the 100m and 200m isotath in various seasons and various layers, and mostly near the 200m isobath. In the sea area northeast of Taiwan, the Kuroshio water is to the west most in spring and then in winter. In summer, it is to the east most while, in autumn, it is in between its positions in summer and winter. At the bottom in summer and from surface to bottom in spring, the Kuroshio water mainly comes from the sear area to the Northeast of Taiwan while part of it from the Taiwan Straits. Near the R_1, the intrusion of Kuroshio water into the shelf is the strongest in winter and the boundary is to the west; in summer, the intrusion is the weakest in the most cases and the autumn is in between the above two cases. (3) There is crisscross intrusion between the Kuroshio water and the shelf mixing water.