A Study on the South Korean Coastal Front

한국 남해연안 전선에 관한 연구

The structure of the south Korean coastal front, their fluctuation, the properties and the probable effects of the front on the mackerel fishery are discussed based on the data of 26 cruises in 1967-1969 in the southern waters of Korea. In the south Korean coastal water the annual variations of the properties shows the greatest magnitude among the other water masses in the north of East China Sea. The salinity profile provides a fairly accurate description of the interface between the two kinds of water and agree with the temperature structure in winter. The temperature front does not always coincide with the salinity front in summer, while the former corresponds to the later in winter. The sharpest and most stable front between the Tsushima Warm Current and the south Koren coastal water was found in autumn and winter. In autumn 1969, the most successful catches of mackerel was recorded in the south Korean front of great borizontal gradients of properties(temperature 5.0$^{\circ}C$/10miles, salinity 1.2 /10miles) in the east of Cheju Is. If future investigation finds the peculiar oceanographical conditions like that shown in summer, 1969, the conditions of frontal layer in coming autumn will be estimated and finally the success of the mackerel fishery will be predictable from preseason information on temperature and salinity structure in the southern waters of Korea.

대마난류 유역의 해양조사는 W st(1936), Tsujita(1957) 등이 보고한 바와 같이 1873년경 Schrenck, L.가 대마난류의 정체를 밝힌데서 시작된다. 한국 남해의 수리적 해황에 대해서는 Makaroff91915), Wada(1922), Nisida(1923, '24, '27, '28), Uda (1930, '31, '34a, '34b, '36, '50), Suda and Hidaka(1930a, '30b), Hidaka and Suzaki(1950), Miyazaki and Abe91960), Gong(1968), 그리고 Lee and Bong(1969)등, 여러사람에 의한 조사 보고가 있다. 한국 국립수산진흥원과 그 전신인 중앙수산 시험장은 제2차대전 후의 몇 년간의 공백을 제외하고는 매년 정기적으로 해양관측을 실시하여 어장환경요인을 해양조사년보와 해 어황속보를 통하여 어민에게 공표하여 왔다.(1935, '36ㅁ, '36ㅠ, '38, '42, '56, '64, '68, '70)