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노홍길,평야해행 한국수산학회 1983 한국수산과학회지 Vol.16 No.4
A tongue-like warm water which is a part of the Tsusima Warm Current appears whole year around in the east entrance of the Jeju Strait. Because of this warm water, the current direction flowing into the Jeju Strait from its west area seems to be changed in the Jeju Strait. Therefore the intermediate and bottom water of the Jeju Strait may greatly influence the formation of the coastal water in the South Coast of Korea. Since this tongue-like warm water is stronger in winter than in summer in its formation, Tsushima Warm Current comes closer to the South Coast of Korea in winter and its north boundary frequently approaches close to the Coast of Geomun Island and Sori Island.
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제주도 , 주변해역에 출현하는 중국대륙연안수에 관한 연구
노홍길,김인옥 한국수산학회 1994 한국수산과학회지 Vol.27 No.5
제주도 주변해역에 출현하는 중국대륙연안수의 특성을 여러자료를 근거로 분석한 결과를 요약하면 다음과 같다. 1. 제주도 주변해역에 출현하는 여러 水塊中 32.20‰ 이하의 저염분수는 중국대륙연안수로 해석 된다. 2. 본 연구기간중, 제주해헙 표층에는 1월∼5월 중순까지는 34.00‰ 이상의 고염분수가 출현했고, 5월 하순부터 점차적으로 염분이 低下하여 32.20‰ 이하의 중국대륙연안수는 7월초에 출현하여 10월 중에 소멸했다. 3. 제주해협에서 중국대륙연안수의 두께는 평균 25m이고, 대체로 50m 정도의 깊이까지 영향을 주고 있다. 그러므로 동 해협의 夏季 成層構造는 0∼50m까지는 심한 염분약층이 형성되며 50m以深은 冬季와 같이 均質鹽分層에 가까운 成層이 된다. 4. 夏季에는 제주도 주변표층 대부분의 해역에 중국대륙연안수가 출현하지만 그 중 최저염분을 갖는 이 연안수의 Core는 제주도 서방해역에서 제주해협 서쪽 입구로 流入되어 동 해협 중앙부를 통해 해협 동쪽으로 流出되며, 해협을 통과한 후에는 渦流의 형태로 이동되는 것 같다. China Coastal Water(CCW) appeared in the neighbouring seas of Cheju Island has been analyzed and the results are as follows: The water with salinity below 32.20‰ in the neighbouring seas of Cheju Island in summer is thought CCW. During the period from April 1985 to August 1986, salinity of more than 34.00‰ was appeared in the Cheju Strait during January to mid May, but it decreased gradually from late May. CCW with salinity below 32.20‰ appeared in the Cheju Strait in early July and disappeared in October. The mean thickness of CCW in the Cheju Strait was about 25m and CCW had an influence of up to about 50m depth. And stratification structure of the Cheju Strait in summer was halocline between the surface and 50m depth and homogeneous salinity layer below 50m depth. It seems that although CCW appears in the wide area of neighbouring seas surface of Cheju Island in summer, the core of this CCW which has the lowest salinity flows into the Cheju Strait from the western seas of Cheju Island. This CCW flows out the east through the central part of the Cheju Strait and then seems to be transported further in the form of eddy.
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노홍길,방익찬,김상현,현경훈,김준택,양영진,홍창수 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
Currents are measured in the Straits of Cheju by detecting surface buoy tracks and mooring current meters in 1996-1997. As a result, north-eastward currents are decteted in the Straits of Cheju all the year round, which is weak in spring and strong in summer and fall. Average speeds of 20 cm/s to the east. 7 cm/s to the north and 22 cm/s to the north-east appeared in the surface. Currents are fast in the middle of the strait and slow near Cheju Island. East-west components of the currents are about 3 times faster than the north-south ones. Also. it is shown that surface buoys released within the distance of 6 miles away from Cheju do not drift out of the Straits of Cheju because of tongue-like warm waters appeared in the eastern entrance of the strait. Volume transports calculated by geostrophic calculation are shown to be 0.05-0.2 Sv in winter and 0.4-0.5 Sv in summer.
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노홍길,김구,Rho, Hong Kil,Kim, Kuh 한국해양학회 1983 韓國海洋學會誌 Vol.18 No.1
A series of sheps-of-opportunity sea sryface temperature (SST) measurement beween Jeju and Wando during a period from December 1979 through June 1981 produced following results. 1. A sihnificantly warm water appeared south of Chuja Island and Cheongsan Island during Island. It is suggested that this water represents a current entering the Jeju Strait from the west. Direction of this currint in other seasons is not certain. 2. Coastal waters were found north of the Cheongsan Island and Bogil Islhnd throughout the measurement period. In February these waters sometimes reached as far as Chuja Island to south. 3. Frequently thermal fronts were observed near the Chuja Island and the Cheongsan Island. 4. In summer cold waters appeared north of the Chuja Island and Changsu Island. Intrusion of cold bottom water from offshore and its subsequent vertical mixing due to strong tidal current are probably reponsible for this appearance. 5. Cold waters also appeared locally around islands and in ghe Jeju Harbor in spring and summer. 6. North-south SST difference reached 8-9$^{\circ}C$ in winter which is the annual maximum. 7. Annual range of SST varies from 12-14$^{\circ}C$ in the central part of the Jeju Strait to 16-20$^{\circ}C$ in coastal waters to north. The highest SST appeared everywhere in September but the lowest one did not appesr in the same month of year.
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노홍길,정공흔 한국수산학회 1976 한국수산과학회지 Vol.9 No.2
(目的) 濟州近海 海況硏究의 一環으로, 黃海와 南海에 出現하는 各種水塊에 대한 濟州海峽의 海洋學的인 意義와 同海峽의 海況特性에 關해 究明하고자 했다. (方法) 濟州海峽內에는 稠密한 觀測点을 設定하고 短時日內에 調査가 完了되도록 했다. 또 黃海暖流와 黃海冷水가 同海峽의 海況과 密接한 관계가 있을 것으로 보고 가급적 이들 水塊를 充分히 把握할 수 있도록 國立水産 振興院 海洋觀測 定線 313線과 312線의 St. 11까지 調査했다. 調査期間은 1975.9.18∼9.22까지이며 調査項目은 水溫과 鹽分이다. (結果) 1. 濟州海峽의 夏季 鉛直水溫은 10∼30m 水層에 심한 水溫躍層이 形成되어 表層과 底層의 鉛直混合이 잘 이루어지지 않아 表層水溫은 氣溫變化에 크게 좌우되고 특히 파도에 의한 强制混合은 急激한 表層水溫의 變化를 가져 올 수 있다. 2. 濟州海峽內에서 北側과 南側의 流向이 다를 수 있고 또 同海峽內에서 黃海水와 南海水가 相衝하여 그 流向을 바꿀 수 있다. 3. 濟州西方海域에는 東流(表層) 및 酉流(50m層)가 있고 이들은 各各 蛇行現象을 보인다.
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