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Rapid Sediment Accumulation Results in High Methane Effluxes from Coastal Sediments

Fig 5

Profiles of selected pore water constituents and C_org, as well as rates of SO₄^2- reduction (SRR), methanogenesis and SO₄-AOM derived from the reactive transport model.

Note that extensive bubble formation and degassing of CH₄ was observed during coring, explaining the offset between modeled and measured CH₄ concentrations at depth. Also note that the modeled CH₄ concentrations exceed the CH₄ solubility concentrations of ~ 10 mM, indicating the presence of free CH₄ gas in the sediments of the Scharendijke basin

doi: https://doi.org/10.1371/journal.pone.0161609.g005