TY  - SER
AU  - Wild,Birgit
AU  - Shakhova,Natalia
AU  - Dudarev,Oleg V.
AU  - Ruban,Alexey
AU  - Kosmach,Denis
AU  - Tumskoy,Vladimir
AU  - Tesi,Tommaso
AU  - Grimm,Hanna
AU  - Nybom,Inna
AU  - Matsubara,Felipe
AU  - Alexanderson,Helena
AU  - Jakobsson,Martin
AU  - Mazurov,Alexey
AU  - Semiletov,Igor P.
AU  - Gustafsson,Örjan
TI  - Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
KW  - Лаптевых море
KW  - парниковые газы
KW  - подводная мерзлота
KW  - статьи в журналах
N1  - Библиогр.: 74 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:000996466
ER  -