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

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, deg...

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Autores principales: Wild, Birgit, Shakhova, Natalia, Dudarev, Oleg, Ruban, Alexey, Kosmach, Denis, Tumskoy, Vladimir, Tesi, Tommaso, Grimm, Hanna, Nybom, Inna, Matsubara, Felipe, Alexanderson, Helena, Jakobsson, Martin, Mazurov, Alexey, Semiletov, Igor, Gustafsson, Örjan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9420143/
https://www.ncbi.nlm.nih.gov/pubmed/36030269
http://dx.doi.org/10.1038/s41467-022-32696-0
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author Wild, Birgit
Shakhova, Natalia
Dudarev, Oleg
Ruban, Alexey
Kosmach, Denis
Tumskoy, Vladimir
Tesi, Tommaso
Grimm, Hanna
Nybom, Inna
Matsubara, Felipe
Alexanderson, Helena
Jakobsson, Martin
Mazurov, Alexey
Semiletov, Igor
Gustafsson, Örjan
author_facet Wild, Birgit
Shakhova, Natalia
Dudarev, Oleg
Ruban, Alexey
Kosmach, Denis
Tumskoy, Vladimir
Tesi, Tommaso
Grimm, Hanna
Nybom, Inna
Matsubara, Felipe
Alexanderson, Helena
Jakobsson, Martin
Mazurov, Alexey
Semiletov, Igor
Gustafsson, Örjan
author_sort Wild, Birgit
collection PubMed
description 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, CH(4) and CO(2) 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 CH(4) fluxes and strong ocean acidification observed in the region.
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spelling pubmed-94201432022-08-29 Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea Wild, Birgit Shakhova, Natalia Dudarev, Oleg Ruban, Alexey Kosmach, Denis Tumskoy, Vladimir Tesi, Tommaso Grimm, Hanna Nybom, Inna Matsubara, Felipe Alexanderson, Helena Jakobsson, Martin Mazurov, Alexey Semiletov, Igor Gustafsson, Örjan Nat Commun Article 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, CH(4) and CO(2) 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 CH(4) fluxes and strong ocean acidification observed in the region. Nature Publishing Group UK 2022-08-27 /pmc/articles/PMC9420143/ /pubmed/36030269 http://dx.doi.org/10.1038/s41467-022-32696-0 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Wild, Birgit
Shakhova, Natalia
Dudarev, Oleg
Ruban, Alexey
Kosmach, Denis
Tumskoy, Vladimir
Tesi, Tommaso
Grimm, Hanna
Nybom, Inna
Matsubara, Felipe
Alexanderson, Helena
Jakobsson, Martin
Mazurov, Alexey
Semiletov, Igor
Gustafsson, Örjan
Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title_full Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title_fullStr Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title_full_unstemmed Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title_short Organic matter composition and greenhouse gas production of thawing subsea permafrost in the Laptev Sea
title_sort organic matter composition and greenhouse gas production of thawing subsea permafrost in the laptev sea
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9420143/
https://www.ncbi.nlm.nih.gov/pubmed/36030269
http://dx.doi.org/10.1038/s41467-022-32696-0
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