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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

Abstract

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.

Keywords

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, https://doi.org/10.7837/kosomes.2016.22.6.731
  2. Time-series Variation of Sea Surface Salinity in the Southwestern East Sea vol.18, pp.4, 2013, https://doi.org/10.7850/jkso.2013.18.4.163
  3. Seasonal Change of Phytoplankton Dominant Species Based on Water Mass in the Coastal Areas of the East Sea vol.21, pp.5, 2015, https://doi.org/10.7837/kosomes.2015.21.5.474

Acknowledgement

Grant : 동해 어업자원과 환경생태조사

Supported by : 국립수산과학원