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Methane emissions from macrophyte beach wrack on Baltic seashores
Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91, Stockholm, Sweden.
Blue Centre Gotland, Uppsala University-Campus Gotland, 621 67, Visby, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.ORCID iD: 0000-0003-3745-4092
Department of Marine Sciences, University of Gothenburg, Box 461, 405 30, Gothenburg, Sweden, Box 461.
2023 (English)In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 52, no 1, p. 171-181Article in journal (Refereed) Published
Abstract [en]

Beach wrack of marine macrophytes is a natural component of many beaches. To test if such wrack emits the potent greenhouse gas methane, field measurements were made at different seasons on beach wrack depositions of different ages, exposure, and distance from the water. Methane emissions varied greatly, from 0 to 176 mg CH4-C m−2 day−1, with a clear positive correlation between emission and temperature. Dry wrack had lower emissions than wet. Using temperature data from 2016 to 2020, seasonal changes in fluxes were calculated for a natural wrack accumulation area. Such calculated average emissions were close to zero during winter, but peaked in summer, with very high emissions when daily temperatures exceeded 20 °C. We conclude that waterlogged beach wrack significantly contributes to greenhouse gas emissions and that emissions might drastically increase with increasing global temperatures. When beach wrack is collected into heaps away from the water, the emissions are however close to zero.

Place, publisher, year, edition, pages
Springer Nature , 2023. Vol. 52, no 1, p. 171-181
Keywords [en]
Baltic Sea, Beach cast, Climate change, Greenhouse gas, Marine macrophytes, Methane
National Category
Environmental Sciences Geochemistry
Identifiers
URN: urn:nbn:se:kth:diva-329047DOI: 10.1007/s13280-022-01774-4ISI: 000846110100001PubMedID: 36029461Scopus ID: 2-s2.0-85137064230OAI: oai:DiVA.org:kth-329047DiVA, id: diva2:1768078
Note

QC 20230614

Available from: 2023-06-14 Created: 2023-06-14 Last updated: 2023-06-14Bibliographically approved

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Gröndahl, Fredrik

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