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

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

Bibliographic Details
Parent link:	Nature Communications Vol. 13.— 2022.— [5057, 12 р.]
Corporate Author:	Национальный исследовательский Томский политехнический университет Инженерная школа природных ресурсов Отделение геологии
Other Authors:	Wild B. Birgit, Shakhova N. E. Nataljya Evgenjevna, Ruban A. S. Aleksey Sergeevich, Kosmach D. A. Denis Alekseevich, Tumskoy V. E. Vladimir, Tesi T. Tommaso, Grimm H. Hanna, Nybom I. Inna, Matsubara F. Felipe, Alexanderson H. Helena, Jakobsson M. Martin, Mazurov A. K. Aleksey Karpovich, Semiletov I. P. Igor Petrovich, Gustafsson O. Orjan
Summary:	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.
Published:	2022
Subjects:	электронный ресурс труды учёных ТПУ carbon cycle
Online Access:	https://doi.org/10.1038/s41467-022-32696-0
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=669003

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