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The long-term fate of permafrost peatlands under rapid climate warming
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2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5Article in journal (Refereed) Published
Abstract [en]

Permafrost peatlands contain globally important amounts of soil organic carbon, owing to cold conditions which suppress anaerobic decomposition. However, climate warming and permafrost thaw threaten the stability of this carbon store. The ultimate fate of permafrost peatlands and their carbon stores is unclear because of complex feedbacks between peat accumulation, hydrology and vegetation. Field monitoring campaigns only span the last few decades and therefore provide an incomplete picture of permafrost peatland response to recent rapid warming. Here we use a high-resolution palaeoecological approach to understand the longer-term response of peatlands in contrasting states of permafrost degradation to recent rapid warming. At all sites we identify a drying trend until the late-twentieth century; however, two sites subsequently experienced a rapid shift to wetter conditions as permafrost thawed in response to climatic warming, culminating in collapse of the peat domes. Commonalities between study sites lead us to propose a five-phase model for permafrost peatland response to climatic warming. This model suggests a shared ecohydrological trajectory towards a common end point: inundated Arctic fen. Although carbon accumulation is rapid in such sites, saturated soil conditions are likely to cause elevated methane emissions that have implications for climate-feedback mechanisms.

Place, publisher, year, edition, pages
Nature Publishing Group , 2015. Vol. 5
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-3831DOI: 10.1038/srep17951OAI: oai:DiVA.org:polar-3831DiVA: diva2:1156231
Note

26647837[pmid]

Available from: 2017-11-10 Created: 2017-11-10 Last updated: 2017-11-10

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Publisher's full texthttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673699/
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