Sources and sinks of methane in sea ice: Insights from stable isotopes
We report on methane (CH4) stable isotope (δ13C and δ2H) measurements from landfast sea ice collected near Barrow (Utqiagvik, Alaska) and Cape Evans (Antarctica) over the winter-to-spring transition. These measurements provide novel insights into pathways of CH4 production and consumption in sea ice...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/333402 2024-04-28T08:00:26+00:00 Sources and sinks of methane in sea ice: Insights from stable isotopes Jacques, Caroline Sapart, Célia Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, B. Röckmann, Thomas Van der Veen, Carina Niemann, Helge Haskell, Timothy Tison, Jean-Louis 2021-10-28 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/333402 https://dipot.ulb.ac.be/dspace/bitstream/2013/333402/1/doi_317046.pdf en eng uri/info:doi/10.1525/elementa.2020.00167 uri/info:scp/85118304090 https://dipot.ulb.ac.be/dspace/bitstream/2013/333402/1/doi_317046.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/333402 1 full-text file(s): info:eu-repo/semantics/openAccess Elementa: Science of the Anthropocene, 9 (1 Sciences exactes et naturelles Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2021 ftunivbruxelles 2024-04-10T00:14:40Z We report on methane (CH4) stable isotope (δ13C and δ2H) measurements from landfast sea ice collected near Barrow (Utqiagvik, Alaska) and Cape Evans (Antarctica) over the winter-to-spring transition. These measurements provide novel insights into pathways of CH4 production and consumption in sea ice. We found substantial differences between the two sites. Sea ice overlying the shallow shelf of Barrow was supersaturated in CH4 with a clear microbial origin, most likely from methanogenesis in the sediments. We estimated that in situ CH4 oxidation consumed a substantial fraction of the CH4 being supplied to the sea ice, partly explaining the large range of isotopic values observed (δ13C between –68.5 and –48.5 ‰ and δ2H between –246 and –104 ‰). Sea ice at Cape Evans was also supersaturated in CH4 but with surprisingly high δ13C values (between –46.9 and –13.0 ‰), whereas δ2H values (between –313 and –113 ‰) were in the range of those observed at Barrow. These are the first measurements of CH4 isotopic composition in Antarctic sea ice. Our data set suggests a potential combination of a hydrothermal source, in the vicinity of the Mount Erebus, with aerobic CH4 formation in sea ice, although the metabolic pathway for the latter still needs to be elucidated. Our observations show that sea ice needs to be considered as an active biogeochemical interface, contributing to CH4 production and consumption, which disputes the standing paradigm that sea ice is an inert barrier passively accumulating CH4 at the ocean-atmosphere boundary. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes |
spellingShingle |
Sciences exactes et naturelles Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes Jacques, Caroline Sapart, Célia Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, B. Röckmann, Thomas Van der Veen, Carina Niemann, Helge Haskell, Timothy Tison, Jean-Louis Sources and sinks of methane in sea ice: Insights from stable isotopes |
topic_facet |
Sciences exactes et naturelles Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes |
description |
We report on methane (CH4) stable isotope (δ13C and δ2H) measurements from landfast sea ice collected near Barrow (Utqiagvik, Alaska) and Cape Evans (Antarctica) over the winter-to-spring transition. These measurements provide novel insights into pathways of CH4 production and consumption in sea ice. We found substantial differences between the two sites. Sea ice overlying the shallow shelf of Barrow was supersaturated in CH4 with a clear microbial origin, most likely from methanogenesis in the sediments. We estimated that in situ CH4 oxidation consumed a substantial fraction of the CH4 being supplied to the sea ice, partly explaining the large range of isotopic values observed (δ13C between –68.5 and –48.5 ‰ and δ2H between –246 and –104 ‰). Sea ice at Cape Evans was also supersaturated in CH4 but with surprisingly high δ13C values (between –46.9 and –13.0 ‰), whereas δ2H values (between –313 and –113 ‰) were in the range of those observed at Barrow. These are the first measurements of CH4 isotopic composition in Antarctic sea ice. Our data set suggests a potential combination of a hydrothermal source, in the vicinity of the Mount Erebus, with aerobic CH4 formation in sea ice, although the metabolic pathway for the latter still needs to be elucidated. Our observations show that sea ice needs to be considered as an active biogeochemical interface, contributing to CH4 production and consumption, which disputes the standing paradigm that sea ice is an inert barrier passively accumulating CH4 at the ocean-atmosphere boundary. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Jacques, Caroline Sapart, Célia Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, B. Röckmann, Thomas Van der Veen, Carina Niemann, Helge Haskell, Timothy Tison, Jean-Louis |
author_facet |
Jacques, Caroline Sapart, Célia Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, B. Röckmann, Thomas Van der Veen, Carina Niemann, Helge Haskell, Timothy Tison, Jean-Louis |
author_sort |
Jacques, Caroline |
title |
Sources and sinks of methane in sea ice: Insights from stable isotopes |
title_short |
Sources and sinks of methane in sea ice: Insights from stable isotopes |
title_full |
Sources and sinks of methane in sea ice: Insights from stable isotopes |
title_fullStr |
Sources and sinks of methane in sea ice: Insights from stable isotopes |
title_full_unstemmed |
Sources and sinks of methane in sea ice: Insights from stable isotopes |
title_sort |
sources and sinks of methane in sea ice: insights from stable isotopes |
publishDate |
2021 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/333402 https://dipot.ulb.ac.be/dspace/bitstream/2013/333402/1/doi_317046.pdf |
genre |
Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska |
genre_facet |
Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska |
op_source |
Elementa: Science of the Anthropocene, 9 (1 |
op_relation |
uri/info:doi/10.1525/elementa.2020.00167 uri/info:scp/85118304090 https://dipot.ulb.ac.be/dspace/bitstream/2013/333402/1/doi_317046.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/333402 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1797572662257516544 |