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Large stocks of pea...
Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw
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- Hugelius, Gustaf (author)
- Stockholms universitet,Institutionen för naturgeografi,Stanford University, USA
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Loisel, Julie (author)
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Chadburn, Sarah (author)
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Jackson, Robert B. (author)
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Jones, Miriam (author)
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MacDonald, Glen (author)
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Marushchak, Maija (author)
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Olefeldt, David (author)
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Packalen, Maara (author)
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- Siewert, Matthias B. (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum
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Treat, Claire (author)
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Turetsky, Merritt (author)
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Voigt, Carolina (author)
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Yu, Zicheng (author)
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(creator_code:org_t)
- 2020-08-10
- 2020
- English.
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In: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 117:34, s. 20438-20446
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Abstract
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- Northern peatlands have accumulated large stocks of organic carbon (C) and nitrogen (N), but their spatial distribution and vulnerability to climate warming remain uncertain. Here, we used machine-learning techniques with extensive peat core data (n > 7,000) to create observation-based maps of northern peatland C and N stocks, and to assess their response to warming and permafrost thaw. We estimate that northern peatlands cover 3.7 ± 0.5 million km2 and store 415 ± 150 Pg C and 10 ± 7 Pg N. Nearly half of the peatland area and peat C stocks are permafrost affected. Using modeled global warming stabilization scenarios (from 1.5 to 6 °C warming), we project that the current sink of atmospheric C (0.10 ± 0.02 Pg C⋅y−1) in northern peatlands will shift to a C source as 0.8 to 1.9 million km2 of permafrost-affected peatlands thaw. The projected thaw would cause peatland greenhouse gas emissions equal to ∼1% of anthropogenic radiative forcing in this century. The main forcing is from methane emissions (0.7 to 3 Pg cumulative CH4-C) with smaller carbon dioxide forcing (1 to 2 Pg CO2-C) and minor nitrous oxide losses. We project that initial CO2-C losses reverse after ∼200 y, as warming strengthens peatland C-sinks. We project substantial, but highly uncertain, additional losses of peat into fluvial systems of 10 to 30 Pg C and 0.4 to 0.9 Pg N. The combined gaseous and fluvial peatland C loss estimated here adds 30 to 50% onto previous estimates of permafrost-thaw C losses, with southern permafrost regions being the most vulnerable.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
Keyword
- northern peatlands
- carbon stocks
- nitrogen stocks
- greenhouse gas fluxes
- permafrost thaw
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Hugelius, Gustaf
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Loisel, Julie
-
Chadburn, Sarah
-
Jackson, Robert ...
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Jones, Miriam
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MacDonald, Glen
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show more...
-
Marushchak, Maij ...
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Olefeldt, David
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Packalen, Maara
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Siewert, Matthia ...
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Treat, Claire
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Turetsky, Merrit ...
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Voigt, Carolina
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Yu, Zicheng
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
- Articles in the publication
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Proceedings of t ...
- By the university
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Stockholm University
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Umeå University