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Siberian Arctic inland waters emit mostly contemporary carbon
Dean, J; Meisel, O; Roscoe, MM et al.
2020EGU General Assembly 2020
Peer reviewed
 

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Keywords :
Methane; CH4; méthane; lake; river
Abstract :
[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 emissions were contemporary in age, but that 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. The study region was a net carbon sink (-876.9 ± 136.4 Mg C for 25 July to 17 August), but inland waters were a source of contemporary (16.8 Mg C) and pre-aged (3.7 Mg C) emissions that respectively offset 1.9 ± 1.2% and 0.4 ± 0.3% of CO2 uptake by tundra (‑897 ± 115 Mg C). 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, J
Meisel, O
Roscoe, MM
Marchesini
Garnett, M
Lenderink, H
van Logtestijn, R
Borges, Alberto  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU)
Bouillon, S
Lambert, T
Röckmann, T
Maximov, T
Petrov, R
Karsanaev, S
Aerts, R
van Huissteden, J
Vonk, J
Dolman, H
More authors (8 more) Less
Language :
English
Title :
Siberian Arctic inland waters emit mostly contemporary carbon
Publication date :
04 May 2020
Event name :
EGU General Assembly 2020
Event place :
Vienna, Austria
Event date :
4 to 8 May 2020
Audience :
International
Peer reviewed :
Peer reviewed
Commentary :
Sharing Geoscience Online (event cancelled due to COVID-19 pandemic)
Available on ORBi :
since 08 April 2020

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