The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis
The Arctic Ocean, especially the East Siberian Arctic Shelf (ESAS), has been proposed as a significant source of methane that might play an increasingly important role in the future. However, the underlying processes of formation, removal and transport associated with such emissions are to date stro...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/253190 2023-05-15T14:53:37+02:00 The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis Sapart, Célia Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg Van der Veen, Carina Egger, Matthias 2017-05 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/253190 https://dipot.ulb.ac.be/dspace/bitstream/2013/253190/1/doi_236817.pdf en eng uri/info:doi/10.5194/bg-14-2283-2017 uri/info:scp/85019061008 uri/info:ulb-repo/set/1 https://dipot.ulb.ac.be/dspace/bitstream/2013/253190/1/doi_236817.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/253190 1 full-text file(s): info:eu-repo/semantics/openAccess Biogeosciences, 14 (9 Géologie et minéralogie Evolution des espèces Ecologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2017 ftunivbruxelles 2022-06-12T21:32:48Z The Arctic Ocean, especially the East Siberian Arctic Shelf (ESAS), has been proposed as a significant source of methane that might play an increasingly important role in the future. However, the underlying processes of formation, removal and transport associated with such emissions are to date strongly debated. CH4 concentration and triple isotope composition were analyzed on gas extracted from sediment and water sampled at numerous locations on the shallow ESAS from 2007 to 2013. We find high concentrations (up to 500 μM) of CH4 in the pore water of the partially thawed subsea permafrost of this region. For all sediment cores, both hydrogen and carbon isotope data reveal the predominant occurrence of CH4 that is not of thermogenic origin as it has long been thought, but resultant from microbial CH4 formation. At some locations, meltwater from buried meteoric ice and/or old organic matter preserved in the subsea permafrost were used as substrates. Radiocarbon data demonstrate that the CH4 present in the ESAS sediment is of Pleistocene age or older, but a small contribution of highly 14C-enriched CH4, from unknown origin, prohibits precise age determination for one sediment core and in the water column. Our sediment data suggest that at locations where bubble plumes have been observed, CH4 can escape anaerobic oxidation in the surface sediment. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Arctic Arctic Ocean Ice permafrost DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie et minéralogie Evolution des espèces Ecologie |
spellingShingle |
Géologie et minéralogie Evolution des espèces Ecologie Sapart, Célia Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg Van der Veen, Carina Egger, Matthias The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
topic_facet |
Géologie et minéralogie Evolution des espèces Ecologie |
description |
The Arctic Ocean, especially the East Siberian Arctic Shelf (ESAS), has been proposed as a significant source of methane that might play an increasingly important role in the future. However, the underlying processes of formation, removal and transport associated with such emissions are to date strongly debated. CH4 concentration and triple isotope composition were analyzed on gas extracted from sediment and water sampled at numerous locations on the shallow ESAS from 2007 to 2013. We find high concentrations (up to 500 μM) of CH4 in the pore water of the partially thawed subsea permafrost of this region. For all sediment cores, both hydrogen and carbon isotope data reveal the predominant occurrence of CH4 that is not of thermogenic origin as it has long been thought, but resultant from microbial CH4 formation. At some locations, meltwater from buried meteoric ice and/or old organic matter preserved in the subsea permafrost were used as substrates. Radiocarbon data demonstrate that the CH4 present in the ESAS sediment is of Pleistocene age or older, but a small contribution of highly 14C-enriched CH4, from unknown origin, prohibits precise age determination for one sediment core and in the water column. Our sediment data suggest that at locations where bubble plumes have been observed, CH4 can escape anaerobic oxidation in the surface sediment. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Sapart, Célia Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg Van der Veen, Carina Egger, Matthias |
author_facet |
Sapart, Célia Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg Van der Veen, Carina Egger, Matthias |
author_sort |
Sapart, Célia |
title |
The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
title_short |
The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
title_full |
The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
title_fullStr |
The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
title_full_unstemmed |
The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
title_sort |
origin of methane in the east siberian arctic shelf unraveled with triple isotope analysis |
publishDate |
2017 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/253190 https://dipot.ulb.ac.be/dspace/bitstream/2013/253190/1/doi_236817.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice permafrost |
genre_facet |
Arctic Arctic Ocean Ice permafrost |
op_source |
Biogeosciences, 14 (9 |
op_relation |
uri/info:doi/10.5194/bg-14-2283-2017 uri/info:scp/85019061008 uri/info:ulb-repo/set/1 https://dipot.ulb.ac.be/dspace/bitstream/2013/253190/1/doi_236817.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/253190 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766325215489425408 |