Sources and sinks of methane in sea ice: Insights from stable isotopes
We report on methane (CH4) stable isotope (d13C and d2H) 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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ftunivutrecht:oai:dspace.library.uu.nl:1874/413939 2024-04-28T08:00:24+00:00 Sources and sinks of methane in sea ice: Insights from stable isotopes Jacques, Caroline Sapart, Célia J. Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, Bruno Röckmann, Thomas van der Veen, Carina Niemann, Helge Haskell, Tim Tison, Jean Louis Sub Algemeen Marine & Atmospheric Res Sub Atmospheric physics and chemistry Geochemistry Marine and Atmospheric Research 2021-10-27 application/pdf https://dspace.library.uu.nl/handle/1874/413939 en eng https://dspace.library.uu.nl/handle/1874/413939 info:eu-repo/semantics/OpenAccess Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes Oceanography Environmental Engineering Ecology Geotechnical Engineering and Engineering Geology Geology Atmospheric Science Article 2021 ftunivutrecht 2024-04-09T23:39:59Z We report on methane (CH4) stable isotope (d13C and d2H) 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 (d13C between -68.5 and -48.5 ‰ and d2H between -246 and -104 ‰). Sea ice at Cape Evans was also supersaturated in CH4 but with surprisingly high d13C values (between -46.9 and -13.0 ‰), whereas d2H 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes Oceanography Environmental Engineering Ecology Geotechnical Engineering and Engineering Geology Geology Atmospheric Science |
spellingShingle |
Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes Oceanography Environmental Engineering Ecology Geotechnical Engineering and Engineering Geology Geology Atmospheric Science Jacques, Caroline Sapart, Célia J. Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, Bruno Röckmann, Thomas van der Veen, Carina Niemann, Helge Haskell, Tim Tison, Jean Louis Sources and sinks of methane in sea ice: Insights from stable isotopes |
topic_facet |
Antarctic Arctic Consumption pathways Methane Production Sea ice Stable isotopes Oceanography Environmental Engineering Ecology Geotechnical Engineering and Engineering Geology Geology Atmospheric Science |
description |
We report on methane (CH4) stable isotope (d13C and d2H) 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 (d13C between -68.5 and -48.5 ‰ and d2H between -246 and -104 ‰). Sea ice at Cape Evans was also supersaturated in CH4 but with surprisingly high d13C values (between -46.9 and -13.0 ‰), whereas d2H 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. |
author2 |
Sub Algemeen Marine & Atmospheric Res Sub Atmospheric physics and chemistry Geochemistry Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Jacques, Caroline Sapart, Célia J. Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, Bruno Röckmann, Thomas van der Veen, Carina Niemann, Helge Haskell, Tim Tison, Jean Louis |
author_facet |
Jacques, Caroline Sapart, Célia J. Fripiat, François Carnat, Gauthier Zhou, Jiayun Delille, Bruno Röckmann, Thomas van der Veen, Carina Niemann, Helge Haskell, Tim 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 |
https://dspace.library.uu.nl/handle/1874/413939 |
genre |
Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska |
genre_facet |
Antarc* Antarctic Antarctica Arctic Barrow Sea ice Alaska |
op_relation |
https://dspace.library.uu.nl/handle/1874/413939 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797572649181773824 |