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利用中日黑潮联合调查研究期间“实践”号船1987年夏、冬季,1988年春、秋季的实测资料对研究海域的水系分布及其季节变化进行了分析研究。研究结果表明:(1)与大陆沿岸水性质相近的Ⅳ类混合水秋、冬季分布在大陆沿岸,春、夏季的范围向外海扩展。(2)黑潮水与陆架混合水的边界位置(称为黑潮水左边界)大致位于100～200m等深线之间,并随季节摆动,台湾东北海域,春季黑潮水边界靠近100m等深线,夏季靠近200m等深线,冬、秋季黑潮边界介于春、夏季之间。夏季底层,春季由表至底,黑潮水除了来自台湾以东海域外,还有部分来自台湾海峡。测区东北部R1断面附近,冬季黑潮水入侵陆架势力最强,边界偏西;夏季多数情况最弱,边界偏东;春、秋季位于二者之间。(3)黑潮水与陆架混合水之间有交错入侵现象.(4)陆坡附近多见黑潮水沿坡爬升现象,但有时相反,陆架混合水亦有沿坡下滑的情况。(5)从东南向西北水系的分布,并非完全按照K、Ⅰ、Ⅱ、Ⅲ、Ⅳ类水的顺序,有时出现水系跃变带,其位置也因时因地而异。
Based on the measured data of summer 1987, winter 1988, spring 1988 and autumn of “Practice” during the joint investigation of Kuroshio in China and Japan, the distribution of water system and its seasonal variation in the study area were analyzed. The results show that: (1) Class Ⅳ mixed water with continental water quality is distributed on the coast of China in autumn and winter; the spring and summer range extends to the open sea. (2) The boundary position between the Kuroshio water and the shelf-mixed water (called the Kuroshio water left boundary) is roughly located between the isobaths of 100-200m and swings with the seasons. The northeastern Taiwan region and the spring Kuroshio water boundary are close to the 100m isobath, Near the 200m isobath in summer, the Kuroshio border between winter and autumn is between spring and summer. The bottom of the summer, the spring from the table in the end, except for the Kuroshio from the east of Taiwan outside the sea, there are some from the Taiwan Strait. Near the section R1 in the northeast of the survey area, the winter Kuroshio water invaded the continental shelf with the strongest force and the boundary is westward; most of the conditions are weakest in summer and the boundary is eastward; and the spring and autumn are located between the two. (3) Cross-intrusion occurred between Kuroshio and shelf-mixed water. (4) Climbing phenomenon of Kuroshio along the slope is more common near the slope, but in some cases, the shelf-mixed water slides along the slope. (5) The distribution of water system from southeast to northwest is not entirely in accordance with the order of K, I, II, III and IV water, and sometimes there is a transition zone of water system, the location of which varies from time to time.