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• W1964664694 abstract "To determine parameters having the greatest influence on methane flux, I developed a 7-compartment, 4-layer model of methane production in the Florida Everglades. The four layers consist of a bottom sediment layer, a top, active sediment layer, an algal-mat layer, and an overlying water layer. The compartments are acetate (a major end product of anaerobic decomposition), sulfate-reducing and methane-producing bacteria (major competitors for acetate), sulfate, methane, methane-oxidizing bacteria, and oxygen. Acetate production, depth of the active sediment layer, diffusion rate of oxygen into the sediment, and methane oxidation rate had the greatest influence of methane flux. A two-way sensitivity analysis showed that a change in one of these parameters could enhance or diminish the influence of another. Acetate production was the most sensitive parameter; as it increased, the rate of methane flux increased. Increased oxygen diffusion or methane oxidation diminished the effect of acetate production. Increased depth of the active sediment layer enhanced the effect of acetate production. As depth increased, the amount of acetate produced per area increased, increasing methane production and methane flux. At depths greater than 0.22 m, methane flux asymptotically tapered off. The increased depth increased the distance over which methane must diffuse. This constrained the amount of methane flux from the system. At shallow depths, increased oxygen diffusion and methane oxidation produced significant changes in methane flux. With increasing depth, the influence of these parameters became insignificant. This was attributed to the smaller contribution of oxygen diffusion to the larger volume of sediment, which constrained oxygen concentration and thus methane oxidation." @default.
• W1964664694 created "2016-06-24" @default.
• W1964664694 creator A5009318155 @default.
• W1964664694 date "1993-08-01" @default.
• W1964664694 modified "2023-10-02" @default.
• W1964664694 title "Sensitivity analysis of a simulation model of methane flux from the Florida Everglades" @default.
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• W1964664694 doi "https://doi.org/10.1016/0304-3800(93)90013-i" @default.
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