Permafrost thawing as a possible source of abrupt carbon release at the onset of the Bølling/Allerød


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Peter.Koehler [ at ] awi.de

Abstract

One of the most abrupt and yet unexplained past rises in atmospheric CO2 (410 p.p.m.v. in two centuries) occurred in quasi-synchrony with abrupt northern hemispheric warming into the Bølling/Allerød, B14,600 years ago. Here we use a U/Th-dated record of atmospheric D14C from Tahiti corals to provide an independent and precise age control for this CO2 rise. We also use model simulations to show that the release of old (nearly 14C-free) carbon can explain these changes in CO2 and D14C. The D14C record provides an independent constraint on the amount of carbon released (B125 Pg C). We suggest, in line with observations of atmospheric CH4 and terrigenous biomarkers, that thawing permafrost in high northern latitudes could have been the source of carbon, possibly with contribution from flooding of the Siberian continental shelf during meltwater pulse 1A. Our findings highlight the potential of the permafrost carbon reservoir to modulate abrupt climate changes via greenhouse-gas feedbacks.



Item Type
Conference (Talk)
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Not peer-reviewed
Publication Status
Published
Event Details
PACES-II Annual Meeting, 24 Nov 2014 - 25 Nov 2014, Geesthacht.
Eprint ID
36650
Cite as
Köhler, P. , Knorr, G. and Bard, E. (2014): Permafrost thawing as a possible source of abrupt carbon release at the onset of the Bølling/Allerød , PACES-II Annual Meeting, Geesthacht, 24 November 2014 - 25 November 2014 .


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