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Large stocks of pea...
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Hugelius, GustafStockholms universitet,Institutionen för naturgeografi,Stanford University, USA
(author)
Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-08-10
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Proceedings of the National Academy of Sciences,2020
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Numbers
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LIBRIS-ID:oai:DiVA.org:su-186658
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-186658URI
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https://doi.org/10.1073/pnas.1916387117DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-175825URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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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.
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Added entries (persons, corporate bodies, meetings, titles ...)
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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.Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum(Swepub:umu)masi0110
(author)
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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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Stockholms universitetInstitutionen för naturgeografi
(creator_code:org_t)
Related titles
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In:Proceedings of the National Academy of Sciences of the United States of America: Proceedings of the National Academy of Sciences117:34, s. 20438-204460027-84241091-6490
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- By the author/editor
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Hugelius, Gustaf
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Loisel, Julie
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Chadburn, Sarah
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Jackson, Robert ...
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Jones, Miriam
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MacDonald, Glen
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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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- 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