Global methane emissions from rivers and streams.

Autor: Rocher-Ros G; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden. gerard.rocher.ros@slu.se.; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden. gerard.rocher.ros@slu.se.; Integrative Freshwater Ecology Group, Centre for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Spain. gerard.rocher.ros@slu.se., Stanley EH; Center for Limnology, University of Wisconsin-Madison, Madison, WI, USA., Loken LC; Upper Midwest Water Science Center, United States Geological Survey, Madison, WI, USA., Casson NJ; Department of Geography, University of Winnipeg, Winnipeg, Manitoba, Canada., Raymond PA; School of the Environment, Yale University, New Haven, CT, USA., Liu S; School of the Environment, Yale University, New Haven, CT, USA.; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China., Amatulli G; School of the Environment, Yale University, New Haven, CT, USA., Sponseller RA; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
Jazyk: angličtina
Zdroj: Nature [Nature] 2023 Sep; Vol. 621 (7979), pp. 530-535. Date of Electronic Publication: 2023 Aug 16.
DOI: 10.1038/s41586-023-06344-6
Abstrakt: Methane (CH 4 ) is a potent greenhouse gas and its concentrations have tripled in the atmosphere since the industrial revolution. There is evidence that global warming has increased CH 4 emissions from freshwater ecosystems 1,2 , providing positive feedback to the global climate. Yet for rivers and streams, the controls and the magnitude of CH 4 emissions remain highly uncertain 3,4 . Here we report a spatially explicit global estimate of CH 4 emissions from running waters, accounting for 27.9 (16.7-39.7) Tg CH 4  per year and roughly equal in magnitude to those of other freshwater systems 5,6 . Riverine CH 4 emissions are not strongly temperature dependent, with low average activation energy (E M  = 0.14 eV) compared with that of lakes and wetlands (E M  = 0.96 eV) 1 . By contrast, global patterns of emissions are characterized by large fluxes in high- and low-latitude settings as well as in human-dominated environments. These patterns are explained by edaphic and climate features that are linked to anoxia in and near fluvial habitats, including a high supply of organic matter and water saturation in hydrologically connected soils. Our results highlight the importance of land-water connections in regulating CH 4 supply to running waters, which is vulnerable not only to direct human modifications but also to several climate change responses on land.
(© 2023. The Author(s).)
Databáze: MEDLINE
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