Upland Yedoma taliks are an unpredicted source of atmospheric methane.

Autor: Walter Anthony KM; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, USA. kmwalteranthony@alaska.edu., Anthony P; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, USA., Hasson N; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, USA., Edgar C; Institute of Arctic Biology, University Alaska Fairbanks, Fairbanks, AK, USA., Sivan O; Department of Earth and Environmental Sciences, Ben Gurion University of the Negev, Beersheva, Israel., Eliani-Russak E; Department of Earth and Environmental Sciences, Ben Gurion University of the Negev, Beersheva, Israel., Bergman O; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, USA.; Department of Earth and Environmental Sciences, Ben Gurion University of the Negev, Beersheva, Israel., Minsley BJ; U.S. Geological Survey, Geology, Geophysics, and Geochemistry Science Center, Denver, CO, USA., James SR; U.S. Geological Survey, Geology, Geophysics, and Geochemistry Science Center, Denver, CO, USA., Pastick NJ; U.S. Geological Survey, Earth Resources Observation and Science Center, Sioux Falls, SD, USA., Kholodov A; Geophysical Research Institute, University Alaska Fairbanks, Fairbanks, AK, USA., Zimov S; Pacific Geographical Institute of the Russian Academy of Sciences, Northeast Science Station, Cherskiy, Russia., Euskirchen E; Institute of Arctic Biology, University Alaska Fairbanks, Fairbanks, AK, USA., Bret-Harte MS; Institute of Arctic Biology, University Alaska Fairbanks, Fairbanks, AK, USA., Grosse G; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany.; University of Potsdam, Institute of Geosciences, Potsdam, Germany., Langer M; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany.; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands., Nitzbon J; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jul 18; Vol. 15 (1), pp. 6056. Date of Electronic Publication: 2024 Jul 18.
DOI: 10.1038/s41467-024-50346-5
Abstrakt: Landscape drying associated with permafrost thaw is expected to enhance microbial methane oxidation in arctic soils. Here we show that ice-rich, Yedoma permafrost deposits, comprising a disproportionately large fraction of pan-arctic soil carbon, present an alternate trajectory. Field and laboratory observations indicate that talik (perennially thawed soils in permafrost) development in unsaturated Yedoma uplands leads to unexpectedly large methane emissions (35-78 mg m -2  d -1 summer, 150-180 mg m -2  d -1 winter). Upland Yedoma talik emissions were nearly three times higher annually than northern-wetland emissions on an areal basis. Approximately 70% emissions occurred in winter, when surface-soil freezing abated methanotrophy, enhancing methane escape from the talik. Remote sensing and numerical modeling indicate the potential for widespread upland talik formation across the pan-arctic Yedoma domain during the 21 st and 22 nd centuries. Contrary to current climate model predictions, these findings imply a positive and much larger permafrost-methane-climate feedback for upland Yedoma.
(© 2024. The Author(s).)
Databáze: MEDLINE
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