[논문]진해 당동만의 성층과 빈산소에 따른 퇴적물내 혐기층 발달이 메탄 거동에 미치는 영향 연구

김서영; 안순모

doi:10.4217/opr.2022005

진해 당동만의 성층과 빈산소에 따른 퇴적물내 혐기층 발달이 메탄 거동에 미치는 영향 연구
A Study on the Effect of the Development of Anaerobic Respiration Processes in the Sediment with the Water-column Stratification and Hypoxia and Its Influence on Methane at Dangdong Bay in Jinhae, Korea 원문보기

Ocean and polar research, v.44 no.1, 2022년, pp.1 - 11

김서영 (부산대학교 자연과학대학 해양학과) , 안순모 (부산대학교 자연과학대학 해양학과)

Abstract ▼ AI-Helper

Hypoxia can affect water-atmosphere methane flux by controlling the production and consumption processes of methane in coastal areas. Seasonal methane concentration and fluxes were quantified to evaluate the effects of seasonal hypoxia in Dangdong Bay (Gyeongsangnamdo, Jinhae Bay, South Korea). Sediment-water methane flux increased more than 300 times during hypoxia (normoxia and hypoxia each 6, 1900 µmol m-2 d-1), and water-atmospheric methane flux and bottom methane concentration increased about 2, 10 times (normoxia and hypoxia each 190, 420 µmol m-2 d-1; normoxia and hypoxia each 22, 230 nM). Shoaling of anaerobic decomposition of organic matter in the sediments during the hypoxia (August) was confirmed by the change of the depth at which the maximum hydrogen sulfide concentration was detected. Shoaling shortens the distance between the water column and methanogenesis section to facilitate the inflow of organic matter, which can lead to an increase in methane production. In addition, since the transport distance of the generated methane to the water column is shortened, consumption of methane will be reduced. The combination of increased production and reduced consumption could increase sediment-aqueous methane flux and dissolved methane, which is thought to result in an increase in water-atmospheric methane flux. We could not observe the emission of methane accumulated during the hypoxia due to stratification, so it is possible that the estimated methane flux to the atmosphere was underestimated. In this study, the increase in methane flux in the coastal area due to hypoxia was confirmed, and the necessity of future methane production studies according to oxygen conditions in various coastal areas was demonstratedshown in the future.

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표/그림 (7)

그림 Fig. 1. Sampling station in the Jinhae Bay of South Korea. The study site is Dandong Bay
그림 Fig. 2. Seasonal water column depth profile of (a) temperature, (b) salinity, (c) oxygen, and (d) methane. The shadow area indicates oxygen concentrations in a hypoxic state (< 63 μmol L^-1). T he s tar and dotted line indicate hypoxia
그림 Fig. 3. Sediment and water column depth profile of oxygen and H2S concentrations. The dotted line represents the sediment-water interface. Shadow area means oxygen concentrations in a hypoxic state (< 63 μmol L^-1)
그림 Fig. 4. (a) Surface and bottom water oxygen (left-hand vertical scale, circle, and dotted line). CH₄ concentrations (right-hand vertical scale, triangle, and solid line). (b) Sediment-water oxygen flux (left-hand vertical scale, x, and solid line). CH₄ flux (righthand vertical scale, inverted triangle, and dotted line). The shadow area indicates the time when hypoxia was maintained (An's bowl, Lee et al. 2017)
표 Table 1. Sediment-water methane flux (F_sw) and air-sea methane flux (F_as) in Jinhae Bay. C_s and C_b designate observed surface methane and bottom methane concentrations, respectively. The positive value of F_as refers to CH₄ moving from sea to the atmosphere
그림 Fig. 5. Methane production and oxidation change during normoxia (a) and hypoxia (b). OM (organic matter) (dotted arrow) indicates the organic matter supply route. CH₄ indicates the depth in which CH₄ production occurs. The shadow arrow indicates the CH₄ flux. SR indicates the depth in which sulfate reduction occurs. AMO indicates the depth, where anaerobic oxidation of CH₄ occurs. MO_x (Aerobic oxidation of methane) indicates the depth, where aerobic oxidation of CH₄ occurs
표 Table 2. Air-sea methane fluxes (F_as) and surface methane concentrations from Jinhae Bay and various coastal areas. Numbers in the parenthesis are averaged values. Kw was estimated using the equation of Liss and Merlivat (1986)^a, Wanninkhof (1992)^b, Clark et al. (1995)^c

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저자의 다른 논문 :

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