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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Stockholms universitet, Institutionen för geologiska vetenskaper
2017
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143447 https://doi.org/10.5194/bg-14-2283-2017 |
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ftstockholmuniv:oai:DiVA.org:su-143447 2023-05-15T14:53:39+02:00 The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis Sapart, Célia J. Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg van der Veen, Carina Egger, Matthias Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143447 https://doi.org/10.5194/bg-14-2283-2017 eng eng Stockholms universitet, Institutionen för geologiska vetenskaper Utrecht University, the Netherlands Biogeosciences, 1726-4170, 2017, 14:9, s. 2283-2292 orcid:0000-0001-5965-7662 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143447 doi:10.5194/bg-14-2283-2017 ISI:000400732000002 info:eu-repo/semantics/openAccess Biological Sciences Biologiska vetenskaper Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2017 ftstockholmuniv https://doi.org/10.5194/bg-14-2283-2017 2023-02-23T21:43:27Z 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 sub-strates. Radiocarbon data demonstrate that the CH4 present in the ESAS sediment is of Pleistocene age or older, but a small contribution of highly C-14-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. Article in Journal/Newspaper Arctic Arctic Ocean Ice permafrost Stockholm University: Publications (DiVA) Arctic Arctic Ocean Biogeosciences 14 9 2283 2292 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Biological Sciences Biologiska vetenskaper Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Biological Sciences Biologiska vetenskaper Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Sapart, Célia J. Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg van der Veen, Carina Egger, Matthias Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas The origin of methane in the East Siberian Arctic Shelf unraveled with triple isotope analysis |
topic_facet |
Biological Sciences Biologiska vetenskaper Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
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 sub-strates. Radiocarbon data demonstrate that the CH4 present in the ESAS sediment is of Pleistocene age or older, but a small contribution of highly C-14-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. |
format |
Article in Journal/Newspaper |
author |
Sapart, Célia J. Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg van der Veen, Carina Egger, Matthias Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas |
author_facet |
Sapart, Célia J. Shakhova, Natalia Semiletov, Igor Jansen, Joachim Szidat, Sönke Kosmach, Denis Dudarev, Oleg van der Veen, Carina Egger, Matthias Sergienko, Valentine Salyuk, Anatoly Tumskoy, Vladimir Tison, Jean-Louis Röckmann, Thomas |
author_sort |
Sapart, Célia J. |
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 |
publisher |
Stockholms universitet, Institutionen för geologiska vetenskaper |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143447 https://doi.org/10.5194/bg-14-2283-2017 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ice permafrost |
genre_facet |
Arctic Arctic Ocean Ice permafrost |
op_relation |
Biogeosciences, 1726-4170, 2017, 14:9, s. 2283-2292 orcid:0000-0001-5965-7662 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143447 doi:10.5194/bg-14-2283-2017 ISI:000400732000002 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-14-2283-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
9 |
container_start_page |
2283 |
op_container_end_page |
2292 |
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1766325244650323968 |