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- W4297936863 abstract "Abstract CH 4 emissions from inland waters are highly uncertain in the current global CH 4 budget, especially for the lotic systems like rivers. Previous studies have attributed the strong spatiotemporal heterogeneity of riverine CH 4 to different environmental factors through correlation analysis. However, a mechanistic understanding for such heterogeneity is lacking. Here we combine sediment CH 4 data with a biogeochemical-transport model to show that vertical hydrologic exchange flows (VHEFs), driven by the difference between river stage and groundwater level, determine CH 4 flux at the sediment-water interface. CH 4 fluxes show a nonlinear relationship with the magnitude of VHEFs. In addition, VHEFs lead to the hysteresis of temperature rise and CH 4 emissions because high river discharge leads to strong downwelling flow that offsets increasing CH 4 production with temperature rise. Our findings reveal how the interplay between hydrologic flux and microbial metabolic pathways that compete with methanogenic pathways can produce complex patterns in CH 4 production and emission in riverbed sediments." @default.
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- W4297936863 date "2022-09-29" @default.
- W4297936863 modified "2023-10-16" @default.
- W4297936863 title "Vertical hydrologic exchange flows control methane emissions from riverbed sediments" @default.
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- W4297936863 doi "https://doi.org/10.21203/rs.3.rs-2099837/v1" @default.
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