Exploring the temporal dynamics of methane ebullition in a subtropical freshwater reservoir

Lediane Marcon, Tobias Bleninger, Michael Männich, Mayra Ishikawa, Stephan Hilgert and Andreas Lorke

PLOS ONE, 2024, vol. 19, issue 3, 1-25

Abstract: The transport of methane from sediments to the atmosphere by rising gas bubbles (ebullition) can be the dominant, yet highly variable emission pathway from shallow aquatic ecosystems. Ebullition fluxes have been reported to vary in space and time, as methane production, accumulation, and bubble release from the sediment matrix is affected by several physical and bio-geochemical processes acting at different timescales. Time-series analysis and empirical models have been used for investigating the temporal dynamics of ebullition and its controls. In this study, we analyzed the factors governing the temporal dynamics of ebullition and evaluated the application of empirical models to reproduce these dynamics across different timescales and across different aquatic systems. The analysis is based on continuous high frequency measurements of ebullition fluxes and environmental variables in a mesotrophic subtropical and polymictic freshwater reservoir. The synchronization of ebullition events across different monitoring sites, and the extent to which ebullition was correlated to environmental variables varied throughout the three years of observations and were affected by thermal stratification in the reservoir. Empirical models developed for other aquatic systems could reproduce a limited fraction of the variability in observed ebullition fluxes (R2

Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0298186

DOI: 10.1371/journal.pone.0298186

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