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Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

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

Författare

  • Birgit Wild
  • Natalia Shakhova
  • Oleg Dudarev
  • Alexey Ruban
  • Denis Kosmach
  • Vladimir Tumskoy
  • Tommaso Tesi
  • Hanna Grimm
  • Inna Nybom
  • Felipe Matsubara
  • Helena Alexanderson
  • Martin Jakobsson
  • Alexey Mazurov
  • Igor Semiletov
  • Örjan Gustafsson

Summary, in English

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.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2022

Språk

Engelska

Publikation/Tidskrift/Serie

Nature Communications

Volym

13

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Ämne

  • Geochemistry

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2041-1723