Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Distributions and Sources of Dissolved Organic Matter in Seawaters Surrounding Aqua Farms on the Haengwon-ri in Jeju-Island in Summer 2015

2015년 하계 제주 행원리 일대 양식장주변 해수 중 용존유기물 분포와 기원

  • Kim, Jeonghyun (School of Earth and Environmental Sciences, College of Natural Sciences Seoul National University) ;
  • Kim, Tae-Hoon (Department of Earth and Marine Sciences, College of Ocean Sciences Jeju National University)
  • 김정현 (서울대학교 자연과학대학 지구환경과학부) ;
  • 김태훈 (제주대학교 해양과학대학 지구해양과학과)
  • Received : 2016.10.10
  • Accepted : 2017.03.10
  • Published : 2017.03.30
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Abstract

Concentrations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved organic phosphate (DOP), and colored dissolved organic matter (CDOM) were measured in the coastal sea off inland aqua farms in northeastern Jeju Island in summer 2015. The highest concentrations of DOC, DON, and DOP were revealed in the surface water off Hado-ri where the lowest salinity conditions prevailed (31.6). The concentrations of DOC, DON, and DOP in the surface water were lower in the inner stations (SH1-1, 1-2, and 1-3) near the aqua farms of the Haengwon-ri than in the outer stations. The concentrations of DOC, DON, and DOP negatively correlated with salinity. These results indicate that the contribution of dissolved organic matter (DOM) from the aqua farms seems to be not significant. On the other hand, the higher concentrations of DON and DOP in the inner stations of Hado-ri (HD 1-1) seem to be attributed to excrement of migrating birds. The three components of CDOM (T, M, and C peaks) showed no relationship with salinity, perhaps due to various in situ productions by marine organisms and decomposition by ultraviolet radiation. The observed lower C:M ratio, an indicator of terrestrial source, and the higher biological index (BIX) of CDOM in the station off Hado-ri indicate that DOM is produced mainly by biological activity. Based on the higher humification index (HIX) of CDOM and the higher DOC:DON ratio off Haengwon-ri, refractory DOM in the inland aqua farms is likely transported to the coastal sea.

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