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Title: Long-term CO2 production following permafrost thawing

Author: Elberling, B.; Michelsen, A.; Schadel, C.; Schuur, E.A.G.; Christiansen, H.H.; Berg, L.; Tamstorf, M.P.; Sigsgaard, C.;

Date: 2013

Source:

Publication Series: Scientific Journal (JRNL)

Description: Thawing permafrost represents a poorly understood feedback mechanism of climate change in the Arctic, but with a potential impact owing to stored carbon being mobilized1–5. We have quantified the long-term loss of carbon (C) from thawing permafrost in Northeast Greenland from 1996 to 2008 by combining repeated sediment sampling to assess changes in C stock and >12 years of CO2 production in incubated permafrost samples. Field observations show that the activelayer thickness has increased by >1 cm yr-1 but thawing has not resulted in a detectable decline in C stocks. Laboratory mineralization rates at 5 C resulted in a C loss between 9 and 75%, depending on drainage, highlighting the potential of fast mobilization of permafrost C under aerobic conditions, but also that C at near-saturated conditions may remain largely immobilized over decades. This is confirmed by a three-pool C dynamics model that projects a potential C loss between 13 and 77% for 50 years of incubation at 5 C.

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Elberling, B.; Michelsen, A.; Schadel, C.; Schuur, E.A.G.; Christiansen, H.H.; Berg, L.; Tamstorf, M.P.; Sigsgaard, C. 2013. Long-term CO2 production following permafrost thawing. Nature Climate Change. 3: 890–894.

 


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