Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Chemical Characteristics and Eutrophication in Cheonsu Bay, West Coast of Korea

한국 서해 천수만의 화학적 수질특성과 부영양화

  • Kim, Dong-Seon (Ocean Climate and Environment Research Division, KORDI) ;
  • Lim, Dhong-Il (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Jeon, Soo-Kyung (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Jung, Hoi-Soo (Marine Geoenvironment and Resources Research Division, KORDI)
  • 김동선 (한국해양연구원 해양기후.환경연구본부) ;
  • 임동일 (한국해양연구원 해저환경.자원연구본부) ;
  • 전수경 (한국해양연구원 해저환경.자원연구본부) ;
  • 정회수 (한국해양연구원 해저환경.자원연구본부)
  • Published : 2005.03.31
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Abstract

Temperature, salinity, dissolved oxygen, COD, dissolved inorganic nitrogen(DIN), dissolved inorganic phosphorus (DIP), and chlorophyll were measured in the surface and bottom waters of Cheonsu Bay in April, August, December 2003, and Hay 2004. DIN showed a large seasonal variation, with higher values in summer and lower in spring. The significant decrease in DIN concentration was observed from April to May, which may imply the occurrence of spring phytoplankton bloom sometime in these periods. In contrast, DIP did not show distinct seasonal variation, with relatively low values compared with other coastal regions. The low DIP concentration in Cheonsu Bay is ascribed to a limited phosphorus input around Cheonsu Bay. The Nf ratios of Cheonsu Bay much higher than the Redfield ratio(16) in all season indicate that phytoplankton growth is limited by phosphorus. Based on low chlorophyll concentrations and eutrophication index, Cheonsu Bay has not been in eutrophic condition during our observation periods. In the artificial lakes located around Cheonsu Bay, however, chlorophyll concentrations were very high, mostly over $10{\mu}g\;l^{-1}$, indicating that they are now in severe eutrophic condition.

Keywords

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