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Joshua F Dean - One of the best experts on this subject based on the ideXlab platform.

  • east siberian arctic Inland Waters emit mostly contemporary carbon
    Nature Communications, 2020
    Co-Authors: Joshua F Dean, Ove H Meisel, Melanie Martyn Rosco, Luca Belelli Marchesini, Mark H Garnett, Henk Lenderink, Richard S P Van Logtestijn, Alberto Borges, Steven Bouillon
    Abstract:

    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.

David Bastviken - One of the best experts on this subject based on the ideXlab platform.

Steven Bouillon - One of the best experts on this subject based on the ideXlab platform.

  • east siberian arctic Inland Waters emit mostly contemporary carbon
    Nature Communications, 2020
    Co-Authors: Joshua F Dean, Ove H Meisel, Melanie Martyn Rosco, Luca Belelli Marchesini, Mark H Garnett, Henk Lenderink, Richard S P Van Logtestijn, Alberto Borges, Steven Bouillon
    Abstract:

    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.

Alex Enrichprast - One of the best experts on this subject based on the ideXlab platform.

Lars J Tranvik - One of the best experts on this subject based on the ideXlab platform.