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Near seafloor methane flux in the world's largest human-induced dead zone is regulated by sediment accumulation rate
Stockholm University, Faculty of Science, Department of Geological Sciences. Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.ORCID iD: 0000-0003-1004-5213
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Number of Authors: 82024 (English)In: Marine Geology, ISSN 0025-3227, E-ISSN 1872-6151, Vol. 468, article id 107220Article in journal (Refereed) Published
Abstract [en]

The vast oxygen-depleted area of the central Baltic Sea is the largest human-induced dead zone in the world with 70,000 km(2) or approximately three times the second largest one in the Gulf of Mexico. Methane occurs in high concentrations in bottom waters (3200 nM) and sediments (30 mM), and its dynamics is better constrained for the water column, but still poorly understood on sediments. Here we show that sediment accumulation rate plays a major role in regulating the quantity of organic matter and its residence time in the sulphate reduction and methanogenesis zones and, therefore, affects methane generation, consumption, and diffusive flux in sediments near the seafloor (< 1 m). High fluxes found in high sediment accumulation rate areas and competition for substrate (organoclastic sulphate reduction vs. anaerobic oxidation of methane with sulphate), compromise the ability of the thin microbial filter to consume and prevent methane diffusion through the seafloor.

Place, publisher, year, edition, pages
2024. Vol. 468, article id 107220
Keywords [en]
Baltic Sea, Methane, Sediment accumulation rate, Eutrophication
National Category
Geology
Identifiers
URN: urn:nbn:se:su:diva-227747DOI: 10.1016/j.margeo.2024.107220ISI: 001171382000001Scopus ID: 2-s2.0-85183159693OAI: oai:DiVA.org:su-227747DiVA, id: diva2:1847083
Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-03-26Bibliographically approved

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Stranne, Christian

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