High biolability of ancient permafrost carbon upon thaw

Jorien E. Vonk*, Paul J. Mann, Sergey Davydov, Anna Davydova, Robert G. M. Spencer, John Schade, William V. Sobczak, Nikita Zimov, Sergei Zimov, Ekaterina Bulygina, Timothy I. Eglinton, Robert M. Holmes

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

157 Citaten (Scopus)
299 Downloads (Pure)

Samenvatting

Ongoing climate warming in the Arctic will thaw permafrost and remobilize substantial terrestrial organic carbon (OC) pools. Around a quarter of northern permafrost OC resides in Siberian Yedoma deposits, the oldest form of permafrost carbon. However, our understanding of the degradation and fate of this ancient OC in coastal and fluvial environments still remains rudimentary. Here, we show that ancient dissolved OC (DOC, >21,000 (14)Cyears), the oldest DOC ever reported, is mobilized in stream waters draining Yedoma outcrops. Furthermore, this DOC is highly biolabile: 34 +/- 0.8% was lost during a 14 day incubation under dark, oxygenated conditions at ambient river temperatures. Mixtures of Yedoma stream DOC with mainstem river and ocean waters, mimicking in situ mixing processes, also showed high DOC losses (14 days; 17 +/- 0.8% to 33 +/- 1.0%). This suggests that this exceptionally old DOC is among the most biolabile DOC in any previously reported contemporary river or stream in the Arctic.

Originele taal-2English
Pagina's (van-tot)2689-2693
Aantal pagina's5
TijdschriftGeophysical research letters
Volume40
Nummer van het tijdschrift11
DOI's
StatusPublished - 16-jun-2013

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