Cross continental increase in methane ebullition under climate change

Ralf C. H. Aben, Nathan Barros, Ellen van Donk, Thijs Frenken, Sabine Hilt, Garabet Kazanjian, Leon P. M. Lamers, Edwin T. H. M. Peeters, Jan G. M. Roelofs, Lisette N. Senerpont Domis, Susanne Stephan, Mandy Velthuis, Dedmer B. Van de Waal, Martin Wik, Brett F. Thornton, Jeremy Wilkinson, Tonya DelSontro and Sarian Kosten ()
Additional contact information
Ralf C. H. Aben: Radboud University
Nathan Barros: Federal University of Juiz de Fora
Ellen van Donk: Netherlands Institute of Ecology (NIOO-KNAW)
Thijs Frenken: Netherlands Institute of Ecology (NIOO-KNAW)
Sabine Hilt: Leibniz-Institute of Freshwater Ecology and Inland Fisheries
Garabet Kazanjian: Leibniz-Institute of Freshwater Ecology and Inland Fisheries
Leon P. M. Lamers: Radboud University
Edwin T. H. M. Peeters: Wageningen University
Jan G. M. Roelofs: Radboud University
Lisette N. Senerpont Domis: Netherlands Institute of Ecology (NIOO-KNAW)
Susanne Stephan: Leibniz-Institute of Freshwater Ecology and Inland Fisheries
Mandy Velthuis: Netherlands Institute of Ecology (NIOO-KNAW)
Dedmer B. Van de Waal: Netherlands Institute of Ecology (NIOO-KNAW)
Martin Wik: Stockholm University
Brett F. Thornton: Stockholm University
Jeremy Wilkinson: University of Koblenz-Landau, Institute for Environmental Sciences
Tonya DelSontro: Université du Québec à Montréal
Sarian Kosten: Radboud University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Methane (CH4) strongly contributes to observed global warming. As natural CH4 emissions mainly originate from wet ecosystems, it is important to unravel how climate change may affect these emissions. This is especially true for ebullition (bubble flux from sediments), a pathway that has long been underestimated but generally dominates emissions. Here we show a remarkably strong relationship between CH4 ebullition and temperature across a wide range of freshwater ecosystems on different continents using multi-seasonal CH4 ebullition data from the literature. As these temperature–ebullition relationships may have been affected by seasonal variation in organic matter availability, we also conducted a controlled year-round mesocosm experiment. Here 4 °C warming led to 51% higher total annual CH4 ebullition, while diffusion was not affected. Our combined findings suggest that global warming will strongly enhance freshwater CH4 emissions through a disproportional increase in ebullition (6–20% per 1 °C increase), contributing to global warming.

Date: 2017
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DOI: 10.1038/s41467-017-01535-y

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