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Cross continental increase in methane ebullition under climate change
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Cross continental increase in methane ebullition under climate change
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Journal Article
Cross continental increase in methane ebullition under climate change
2017
Overview
Methane (CH
4
) strongly contributes to observed global warming. As natural CH
4
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 CH
4
ebullition and temperature across a wide range of freshwater ecosystems on different continents using multi-seasonal CH
4
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 CH
4
ebullition, while diffusion was not affected. Our combined findings suggest that global warming will strongly enhance freshwater CH
4
emissions through a disproportional increase in ebullition (6–20% per 1 °C increase), contributing to global warming.
The impacts of climate change on natural methane (CH
4
) emissions via ebullition are unclear. Here, using published and experimental multi-seasonal CH
4
ebullition data, the authors find a strong relationship between CH
4
ebullition and temperature across a wide range of freshwater ecosystems globally.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
