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Linking Sediment Gas Storage to the Methane Dynamics in a Shallow Freshwater Reservoir

Marcon, Lediane; Schwarz, Michael; Backes, Laura; Offermann, Mara; Schreiber, Felix; Hilgert, Stephan 1; Sotiri, Klajdi 1; Jokiel, Christian; Lorke, Andreas
1 Institut für Wasser und Gewässerentwicklung (IWG), Karlsruher Institut für Technologie (KIT)

Abstract:

Freshwater reservoirs are globally relevant sources of the greenhouse gas methane. Organic matter rich sediments are hot spots of methane production and can store large amounts of methane dissolved in porewater and as free gas. Yet, in situ data on the gas storage as free gas (bubbles) in freshwater sediments are scarce. Here, an acoustic approach was tested and used to map the gas content in the sediment of a shallow temperate reservoir. The sediment gas storage was linked to the methane budget obtained from almost 2 years of in situ monitoring. The emission fluxes were dominated by ebullition and degassing at the reservoir outlet, which combined accounted for 93% of the total methane emissions. 66% of the ebullition variability was explained by a combination of environmental parameters. Mappings of sediment gas content using echo sounder surveys revealed the accumulation of free gas in regions of elevated sediment deposition. Temporally, the gas storage in the sediment was related to methane emissions, in which a period of intensified emissions resulted in a reduction of sediment gas storage. The sediment could store an equivalent of 4 to 13 days of accumulated potential methane production, which could supply the mean ebullition flux for more than 2 months. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163913
Veröffentlicht am 13.11.2023
Originalveröffentlichung
DOI: 10.1029/2022JG007365
Scopus
Zitationen: 1
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2023
Sprache Englisch
Identifikator ISSN: 2169-8953, 2169-8961
KITopen-ID: 1000163913
Erschienen in Journal of Geophysical Research: Biogeosciences
Verlag John Wiley and Sons
Band 128
Heft 10
Vorab online veröffentlicht am 16.10.2023
Nachgewiesen in Scopus
Web of Science
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