Net carbon accumulation of a high-latitude permafrost palsa mire similar to permafrost-free peatlands
2012 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 39, L03501- p.Article in journal (Refereed) Published
Palsa mires, nutrient poor permafrost peatlands common in subarctic regions, store a significant amount of carbon (C) and it has been hypothesized their net ecosystem C balance (NECB) is sensitive to climate change. Over two years we measured the NECB for Stordalen palsa mire and found it to accumulate 46 g C m(-2) yr(-1). While Stordalen NECB is comparable to nutrient poor peatlands without permafrost, the component fluxes differ considerably in magnitude. Specifically, Stordalen had both lower growing season CO2 uptake and wintertime CO2 losses, but importantly also low dissolved organic carbon exports and hydrocarbon (mainly methane) emissions. Restricted C losses from palsa mires are likely to have facilitated C accumulation of unproductive subarctic permafrost peatlands. Continued climate change and permafrost thaw is likely to amplify several component fluxes, with an uncertain overall effect on NECB - highlighting the necessity for projections of high-latitude C storage to consider all C fluxes.
Place, publisher, year, edition, pages
2012. Vol. 39, L03501- p.
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-76335DOI: 10.1029/2011GL050355ISI: 000299991700003OAI: oai:DiVA.org:su-76335DiVA: diva2:526681