Oceanographic Features Around Aquaculture Areas of the Eastern Coast of Korea

동해안 연안양식장 주변해역의 해양학적 특성

  • Received : 2013.07.26
  • Accepted : 2013.08.28
  • Published : 2013.08.31


In order to understand the characteristics of oceanic environment in the coastal aquaculture waters of the East Sea, the observation of the CTD (temperature and salinity), dissolved oxygen, chlorophyll a and N/P (DIN ($NO_2$-N, $NO_3$-N, $NH_4$-N) : DIP($PO_4$-P)) ratio was carried out at Sokcho, Jukbyon and Gampo in February, April, June, August, October, December 2013. Based on T(temperature)-S(salinity) diagram analysis, the water masses in the study area were divided into 3 groups; Tsushima Surface Water (TSW: $20-28.3^{\circ}C$ temperatures and 31.04-33.75 salinities), Tsushima Middle Water (TMW: $8.1-16.3^{\circ}C$ and 33.00-34.49), and North Korean Cold Water (NKCW: $1.8-9.4^{\circ}C$ and 33.78-34.42). In winter, DO concentrations in the northern part were higher than those in southern part. In spring and fall, they were low in the surface layer, and increased in summer. Chl-a concentrations < $0.4{\mu}g/L$ dominated in February, April, October and December. Chl-a concentrations were higher in June and August. In particular, the highest Chl-a concentration > $2{\mu}g/L$ was observed in the middle layer of Gampo in August. In February, April, June and December, the N/P ratio in the most of the water masses was less than the Redfield ratio (16), indicating that nitrate did act as a limiting factor in phytoplankton growth. On the contrary, in August and October, the N/P ratio in surface and sub-surface layer was greater than the Redfield ratio, suggesting that phosphate was a limiting factor.


East Sea;Water mass;Dissolved oxygen (DO);Chlorophyll a;N/P ratio


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Cited by

  1. A Study on Cold Water Damage to Marine Culturing Farms at Guryongpo in the Southwestern Part of the East Sea vol.22, pp.6, 2016,
  2. Time-series Variation of Sea Surface Salinity in the Southwestern East Sea vol.18, pp.4, 2013,
  3. Seasonal Change of Phytoplankton Dominant Species Based on Water Mass in the Coastal Areas of the East Sea vol.21, pp.5, 2015,


Grant : 동해 어업자원과 환경생태조사

Supported by : 국립수산과학원