Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea; Nature Communications; Vol. 13
| Parent link: | Nature Communications Vol. 13.— 2022.— [5057, 12 р.] |
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| Coauteur: | |
| Andere auteurs: | , , , , , , , , , , , , , |
| Samenvatting: | Title screen 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. |
| Taal: | Engels |
| Gepubliceerd in: |
2022
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| Onderwerpen: | |
| Online toegang: | https://doi.org/10.1038/s41467-022-32696-0 |
| Formaat: | Elektronisch Hoofdstuk |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=669003 |