Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea

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Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea	3 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1038/s41467-022-32696-0

Title: Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
Creator: Wild, Birgit
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Shakhova, Natalia
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Dudarev, Oleg V.
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Ruban, Alexey
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Kosmach, Denis
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Tumskoy, Vladimir
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Tesi, Tommaso
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Grimm, Hanna
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Nybom, Inna
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Matsubara, Felipe
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Alexanderson, Helena
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Jakobsson, Martin
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Mazurov, Alexey
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Semiletov, Igor P.
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Gustafsson, Örjan
Date: 2022
DOI: 10.1038/s41467-022-32696-0
Description: Subsea permafrost represents a large carbon pool that might be or become a significant greenhouse gas source. Scarcity of observational data causes large uncertainties. We here use five 21-56 m long subsea permafrost cores from the Laptev Sea to constrain organic carbon (OC) storage and sources, degradation state and potential greenhouse gas production upon thaw. Grain sizes, optically-stimulated luminescence and biomarkers suggest deposition of aeolian silt and fluvial sand over 160 000 years, with dominant fluvial/alluvial deposition of forest- and tundra-derived organic matter. We estimate an annual thaw rate of 1.3 ± 0.6 kg OC m−2 in subsea permafrost in the area, nine-fold exceeding organic carbon thaw rates for terrestrial permafrost. During 20-month incubations, CH4 and CO2 production averaged 1.7 nmol and 2.4 µmol g−1 OC d−1, providing a baseline to assess the contribution of subsea permafrost to the high CH4 fluxes and strong ocean acidification observed in the region.

Created: 08-02-2023

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Научное управление Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea