Methane emissions from macrophyte beach wrack on Baltic seashores.

Autor: Björk M; Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91, Stockholm, Sweden. mats.bjork@su.se., Rosenqvist G; Blue Centre Gotland, Uppsala University-Campus Gotland, 621 67, Visby, Sweden., Gröndahl F; KTH, Royale Institute of Technology, KTH Teknikringen 10B, Stockholm, Sweden.; Department of Sustainable Development, Environmental Science and Engineering, 100 44, Stockholm, Sweden., Bonaglia S; Department of Marine Sciences, University of Gothenburg, Box 461, 405 30, Gothenburg, Sweden.
Jazyk: angličtina
Zdroj: Ambio [Ambio] 2023 Jan; Vol. 52 (1), pp. 171-181. Date of Electronic Publication: 2022 Aug 27.
DOI: 10.1007/s13280-022-01774-4
Abstrakt: 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 CH 4 -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.
(© 2022. The Author(s).)
Databáze: MEDLINE
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