The East Siberian Arctic Shelf: towards further assessment of permafrost-related methane fluxes and role of sea ice

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
N ShakhovaÖrjan Gustafsson

Abstract

Sustained release of methane (CH(4)) to the atmosphere from thawing Arctic permafrost may be a positive and significant feedback to climate warming. Atmospheric venting of CH(4) from the East Siberian Arctic Shelf (ESAS) was recently reported to be on par with flux from the Arctic tundra; however, the future scale of these releases remains unclear. Here, based on results of our latest observations, we show that CH(4) emissions from this shelf are likely to be determined by the state of subsea permafrost degradation. We observed CH(4) emissions from two previously understudied areas of the ESAS: the outer shelf, where subsea permafrost is predicted to be discontinuous or mostly degraded due to long submergence by seawater, and the near shore area, where deep/open taliks presumably form due to combined heating effects of seawater, river run-off, geothermal flux and pre-existing thermokarst. CH(4) emissions from these areas emerge from largely thawed sediments via strong flare-like ebullition, producing fluxes that are orders of magnitude greater than fluxes observed in background areas underlain by largely frozen sediments. We suggest that progression of subsea permafrost thawing and decrease in ice extent could result in a signi...Continue Reading

References

Jan 31, 2007·Chemical Reviews·William S Reeburgh
Nov 4, 2009·Proceedings of the National Academy of Sciences of the United States of America·Dirk Notz
Jan 20, 2012·Ambio·Peter Wadhams
Nov 8, 2014·Environmental Science. Processes & Impacts·Pingkang WangRui Xiao

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Citations

Feb 28, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·B SulzbergerN D Paul
Jun 24, 2017·Nature Communications·Natalia ShakhovaDenis Chernykh
Aug 9, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Arna SigurðardóttirSilvana Cardoso
Jun 7, 2017·Proceedings of the National Academy of Sciences of the United States of America·Pavel SerovAlun Hubbard
May 16, 2020·PeerJ·Andrey A VedeninAndrey V Gebruk
May 18, 2020·Nature Communications·Yating ChenJohn C Moore
Mar 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Julia SteinbachÖrjan Gustafsson

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