Effect of sediment resuspension on the cycling of nutrients in the East China Sea

Title
Effect of sediment resuspension on the cycling of nutrients in the East China Sea
Author(s)
김석현; 노태근; 최기영; 홍기훈; 김남훈
KIOST Author(s)
Kim, Suk Hyun(김석현)Rho, TaeKeun(노태근)Ka, Young Choi(최가영)
Publication Year
2016-06-28
Abstract
The continental shelf with strong bottom tidalcurrents, such as the East China Sea (ECS), is generally characterized by the relative high planktonic productivity compared to the stratified open ocean water. We hypothesized that tidal stirring of the bottom sediment rich in planktonic or other biogenic matter might enhance the dissolution or decomposition of their components due to theincreased collision and subsequent breakdown and further dissolution or decomposition reaction of suspended bottom sediments near the sea floor, particularly in the suspended matter rich nepheloidlayer as the tidal energy being dissipated along the sea floor. The resuspension effect of sediment on the nutrients regeneration within water column was studied by shaking or non-shaking bottles, containing seawater only and seawater with the surface sediment from three different sites including one site with high turbulent kinetic energy in the ECS. Inorganic nutrient concentrations were measured at the 1-3 day intervals for two weeks. The anomaly of nutrientconcentration between shaking bottles and nonshaking bottles implies the sediment resuspensioneffect on the nutrient concentration. The phosphate and nitrate concentrations clearly showed logarithmic increase during the shaking experiment, suggesting positive sediment resuspension effect on the nutrient regeneration within the incubation bottle. The portions of phosphate and nitratng of the bottom sediment rich in planktonic or other biogenic matter might enhance the dissolution or decomposition of their components due to theincreased collision and subsequent breakdown and further dissolution or decomposition reaction of suspended bottom sediments near the sea floor, particularly in the suspended matter rich nepheloidlayer as the tidal energy being dissipated along the sea floor. The resuspension effect of sediment on the nutrients regeneration within water column was studied by shaking or non-shaking bottles, containing seawater only and seawater with the surface sediment from three different sites including one site with high turbulent kinetic energy in the ECS. Inorganic nutrient concentrations were measured at the 1-3 day intervals for two weeks. The anomaly of nutrientconcentration between shaking bottles and nonshaking bottles implies the sediment resuspensioneffect on the nutrient concentration. The phosphate and nitrate concentrations clearly showed logarithmic increase during the shaking experiment, suggesting positive sediment resuspension effect on the nutrient regeneration within the incubation bottle. The portions of phosphate and nitrat
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24678
Bibliographic Citation
Goldschmidt 2016, pp.1510, 2016
Publisher
Cambridge
Type
Conference
Language
English
Publisher
Cambridge
Related Researcher
Research Interests

marine pollution management,marine biogeochemistry,marine environmental radioactivity,해양오염관리,해양물질순환,해양환경방사능

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