East Siberian Arctic inland waters emit mostly contemporary carbon

[en] Inland waters (rivers, lakes and ponds) are important conduits for the emission of terrestrial carbon in Arctic permafrost landscapes. These emissions are driven by turnover of contemporary terrestrial carbon and additional pre-aged (Holocene and late-Pleistocene) carbon released from thawing permafrost soils, but the magnitude of these source contributions to total inland water carbon fluxes remains unknown. Here we present unique simultaneous radiocarbon age measurements of inland water CO2, CH4 and dissolved and particulate organic carbon in northeast Siberia during summer. We show that >80% of total inland water carbon was contemporary in age, but pre-aged carbon contributed >50% at sites strongly affected by permafrost thaw. CO2 and CH4 were younger than dissolved and particulate organic carbon, suggesting emissions were primarily fuelled by contemporary carbon decomposition. Our findings reveal that inland water carbon emissions from permafrost landscapes may be more sensitive to changes in contemporary carbon turnover than the release of pre-aged carbon from thawing permafrost.

Research center :

FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège

Disciplines :

Aquatic sciences & oceanology

Author, co-author :

Dean, Joshua F.; Vrije Universiteit Amsterdam

Meisel, Ove H.; Vrije Universiteit Amsterdam

Martyn Rosco, Mélanie

Marchesini, Luca Belelli

Garnett, Mark H.

Lenderink, Henk

van Logtestijn, Richardus

Borges, Alberto ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)

Bouillon, Steven

Lambert, Thibault

More authors (8 more)

Language :

English

Title :

East Siberian Arctic inland waters emit mostly contemporary carbon

Publication date :

02 April 2020

Journal title :

Nature Communications

eISSN :

2041-1723

Publisher :

Nature Publishing Group, United Kingdom

Volume :

Issue :

2020

Pages :

1-10

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.nature.com/articles/s41467-020-15511-6

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Available on ORBi :

since 02 April 2020

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