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- W3042459613 abstract "<p>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 &#8220;pre-aged&#8221; (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 CO<sub>2</sub>, CH<sub>4</sub> 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. CO<sub>2</sub> and CH<sub>4</sub> 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 &#177; 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 &#177; 1.2% and 0.4 &#177; 0.3% of CO<sub>2</sub> uptake by tundra (&#8209;897 &#177; 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.</p>" @default.
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- W3042459613 date "2020-03-10" @default.
- W3042459613 modified "2023-09-26" @default.
- W3042459613 title "Siberian Arctic inland waters emit mostly contemporary carbon" @default.
- W3042459613 doi "https://doi.org/10.5194/egusphere-egu2020-17416" @default.
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