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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 ...

  • 2020-08-10
  • Proceedings of the National Academy of Sciences,2020
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-186658
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-186658URI
  • https://doi.org/10.1073/pnas.1916387117DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-175825URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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 and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Loisel, Julie (author)
  • Chadburn, Sarah (author)
  • Jackson, Robert B. (author)
  • Jones, Miriam (author)
  • MacDonald, Glen (author)
  • Marushchak, Maija (author)
  • Olefeldt, David (author)
  • Packalen, Maara (author)
  • Siewert, Matthias B.Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum(Swepub:umu)masi0110 (author)
  • Treat, Claire (author)
  • Turetsky, Merritt (author)
  • Voigt, Carolina (author)
  • Yu, Zicheng (author)
  • Stockholms universitetInstitutionen för naturgeografi (creator_code:org_t)

Related titles

  • 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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