East Siberian Arctic inland waters emit mostly contemporary carbon

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. © 2020, The Author(s).

Dean J.F.1, 2 , Meisel O.H.1 , Martyn Rosco M. , Marchesini L.B. 3, 4 , Garnett M.H.5 , Lenderink H.1 , Van Logtestijn R. , Borges A.V.7 , Bouillon S.8 , Lambert T.7 , Röckmann T.9 , Maximov T.10, 11 , Petrov R.10, 11 , Karsanaev S.10, 11 , Aerts R.6 , Van Huissteden J. , Vonk J.E.1 , Dolman A.J.1
Nature Publishing Group
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  • 1 Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
  • 2 School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
  • 3 Department of Sustainable Agro-ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
  • 4 Department of Landscape Design and Sustainable Ecosystems, Agrarian‐Technological Institute, RUDN University, Moscow, Russian Federation
  • 5 Natural Environment Research Council Radiocarbon Facility, East Kilbride, United Kingdom
  • 6 Department of Ecological Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
  • 7 Chemical Oceanography Unit, University of Liège, Liège, Belgium
  • 8 Department of Earth and Environmental Science, Katholieke Universiteit Leuven, Leuven, Belgium
  • 9 Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands
  • 10 Institute for Biological Problems of the Cryolithozone, Siberian Branch Russian Academy of Sciences, Yakutsk, Russian Federation
  • 11 North-Eastern Federal University, Yakutsk, Russian Federation
Ключевые слова
carbon; carbon dioxide; methane; organic carbon; carbon dioxide; carbon emission; carbon flux; inland sea; methane; particulate organic carbon; permafrost; radiocarbon dating; thawing; aquatic environment; Arctic; Article; carbon footprint; carbon metabolism; decomposition; inland water; permafrost; radiometric dating; Russian Federation; summer; thawing; turnover rate; Arctic; Siberia
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