title: Massive sedimentation of fine sediment with organic matter and enhanced benthic-pelagic coupling by an artificial dyke in semi-enclosed Chonsu Bay, Korea.
abstract: To assess the impact of an artificial dyke in Chonsu Bay (CBD) on the organic carbon (C(org)) cycle, we measured excess (210)Pb activities, C(org) and nitrogen content in sediment cores. The C(org) oxidation rates (C(ox)) on the surface sediment and benthic nutrient fluxes were also quantified with an in situ benthic chamber. The higher excess (210)Pb inventory, C(org) and nitrogen in cores near the CBD indicated lateral transport and local, massive deposition of particulate matter due to tidal circulation altered by artificial dyke construction. The C(ox) in sediment near the CBD was about twice as high as that out of the bay, suggesting the importance of benthic remineralization of organic matter. The benthic fluxes of dissolved inorganic nitrogen and phosphate were four to six times higher than those outside the bay, corresponding to 141% and 131% respectively, of the requirements for primary production.
authors: Marine Environment Research Division, National Fisheries Research and Development Institute, Busan 619-705, Republic of Korea. Electronic address: leejs728@nfrdi.go.kr.
authors: Jae Seong
authors: JS
authors: Lee
authors: Department of Oceanography, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors: Kee Hyun
authors: KH
authors: Kim
authors: Marine Environment Research Division, National Fisheries Research and Development Institute, Busan 619-705, Republic of Korea.
authors: JungHee
authors: J
authors: Shim
authors: Division of Isotope Geoscience, Korea Basic Science Institute, Yangcheon 363-883, Republic of Korea.
authors: Jeong Hee
authors: JH
authors: Han
authors: Marine Environment Research Division, National Fisheries Research and Development Institute, Busan 619-705, Republic of Korea.
authors: Yang Ho
authors: YH
authors: Choi
authors: Centennial Technology Co., Ansan 426-901, Republic of Korea.
authors: Bhum-Joo
authors: BJ
authors: Khang
mesh_terms: D061006:Bays / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D057486:Carbon Cycle; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry*; D055593:Geological Phenomena; D056910:Republic of Korea; D012623:Seawater / Q000737:chemistry; D014872:Water Movements; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D014873:Water Pollutants