Controls on Stable Methane Isotope Values in Northern Peatlands and Potential Shifts in Values Under Permafrost Thaw Scenarios

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Controls on Stable Methane Isotope Values in Northern Peatlands and Potential Shifts in Values Under Permafrost Thaw Scenarios

Kuhn, McKenzie A. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Varner, Ruth K. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

McCalley, Carmody K. (författare): Rochester Inst Technol, Gosnell Sch Life Sci, Rochester, NY USA.

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Perryman, Clarice R. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.;Stanford Univ, Dept Earth Syst Sci, Stanford, CA USA.

Aurela, Mika (författare): Finnish Meteorol Inst, Climate Syst Res, Helsinki, Finland.

Burke, Sophia A. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Chanton, Jeffrey P. (författare): Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL USA.

Crill, Patrick M. (författare): Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.

DelGreco, Jessica (författare): Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Deng, Jia (författare): Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Heffernan, Liam (författare): Uppsala universitet,Limnologi

Herrick, Christina (författare): Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Hodgkins, Suzanne B. (författare): Ohio State Univ, Dept Microbiol, Columbus, OH USA.

Jones, Cheristy P. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Juutinen, Sari (författare): Finnish Meteorol Inst, Climate Syst Res, Helsinki, Finland.

Kane, Evan S. (författare): Coll Forest Resources & Environm Sci, Houghton, MI USA.;US Forest Serv, USDA, Northern Res Stn, Houghton, MI USA.

Lamit, Louis J. (författare): Syracuse Univ, Dept Biol, Syracuse, NY USA.

Larmola, Tuula (författare): Nat Resources Inst Finland, Helsinki, Finland.

Lilleskov, Erik (författare): US Forest Serv, USDA, Northern Res Stn, Houghton, MI USA.

Olefeldt, David (författare): Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada.

Palace, Michael W. (författare): Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA.;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Rich, Virginia I. (författare): Coll Forest Resources & Environm Sci, Houghton, MI USA.

Schulze, Christopher (författare): Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada.;Univ Montreal, Dept Geog, Montreal, PQ, Canada.

Shorter, Joanne H. (författare): Aerodyne Res Inc, Billerica, MA USA.

Sullivan, Franklin B. (författare): Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA.

Sonnentag, Oliver (författare): Univ Montreal, Dept Geog, Montreal, PQ, Canada.

Turetsky, Merritt R. (författare): Univ Colorado Boulder, Dept Ecol & Evolutionary Biol, Boulder, CO USA.

Waldrop, Mark P. (författare): US Geol Survey, Geol Minerals Energy & Geophys Sci Ctr, Menlo Pk, CA USA.

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Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA;Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA. Rochester Inst Technol, Gosnell Sch Life Sci, Rochester, NY USA. (creator_code:org_t)

American Geophysical Union (AGU), 2024
2024
Engelska.
Ingår i: Journal of Geophysical Research - Biogeosciences. - : American Geophysical Union (AGU). - 2169-8953 .- 2169-8961. ; 129:7

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://uu.diva-port... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

Tidskriftsartikel (refereegranskat)

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Northern peatlands are a globally significant source of methane (CH4), and emissions are projected to increase due to warming and permafrost loss. Understanding the microbial mechanisms behind patterns in CH4 production in peatlands will be key to predicting annual emissions changes, with stable carbon isotopes (δ13C-CH4) being a powerful tool for characterizing these drivers. Given that δ13C-CH4 is used in top-down atmospheric inversion models to partition sources, our ability to model CH4 production pathways and associated δ13C-CH4 values is critical. We sought to characterize the role of environmental conditions, including hydrologic and vegetation patterns associated with permafrost thaw, on δ13C-CH4 values from high-latitude peatlands. We measured porewater and emitted CH4 stable isotopes, pH, and vegetation composition from five boreal-Arctic peatlands. Porewater δ13C-CH4 was strongly associated with peatland type, with δ13C enriched values obtained from more minerotrophic fens (−61.2 ± 9.1‰) compared to permafrost-free bogs (−74.1 ± 9.4‰) and raised permafrost bogs (−81.6 ± 11.5‰). Variation in porewater δ13C-CH4 was best explained by sedge cover, CH4 concentration, and the interactive effect of peatland type and pH (r2 = 0.50, p < 0.001). Emitted δ13C-CH4 varied greatly but was positively correlated with porewater δ13C-CH4. We calculated a mixed atmospheric δ13C-CH4 value for northern peatlands of −65.3 ± 7‰ and show that this value is more sensitive to landscape drying than wetting under permafrost thaw scenarios. Our results suggest northern peatland δ13C-CH4 values are likely to shift in the future which has important implications for source partitioning in atmospheric inversion models.

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Controls on Stable Methane Isotope Values in Northern Peatlands and Potential Shifts in Values Under Permafrost Thaw Scenarios

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