Sources and sinks of methane in sea ice: Insights from stable isotopes
peer reviewed 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 consumpt...
Published in: | Elementa: Science of the Anthropocene |
---|---|
Main Authors: | , , , , , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
BioOne
2021
|
Subjects: | |
Online Access: | https://orbi.uliege.be/handle/2268/264693 https://orbi.uliege.be/bitstream/2268/264693/1/elementa.2020.00167.pdf https://doi.org/10.1525/elementa.2020.00167 |
id |
ftorbi:oai:orbi.ulg.ac.be:2268/264693 |
---|---|
record_format |
openpolar |
spelling |
ftorbi:oai:orbi.ulg.ac.be:2268/264693 2023-05-15T13:56:11+02:00 Sources and sinks of methane in sea ice: Insights from stable isotopes Jacques, C. Sapart, C.J. Fripiat, F. Carnat, G. Zhou, Jiayun Delille, Bruno Röckmann, T van der Veen, C. Niemann, H. Haskell, T. Tison, Jean-Louis FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2021-10-27 https://orbi.uliege.be/handle/2268/264693 https://orbi.uliege.be/bitstream/2268/264693/1/elementa.2020.00167.pdf https://doi.org/10.1525/elementa.2020.00167 en eng BioOne https://doi.org/10.1525/elementa.2020.00167 urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/264693 info:hdl:2268/264693 https://orbi.uliege.be/bitstream/2268/264693/1/elementa.2020.00167.pdf doi:10.1525/elementa.2020.00167 scopus-id:2-s2.0-85118304090 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Elementa: Science of the Anthropocene, 9 (1) (2021-10-27) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2021 ftorbi https://doi.org/10.1525/elementa.2020.00167 2022-12-12T22:02:48Z peer reviewed 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 Barrow Sea ice Alaska University of Liège: ORBi (Open Repository and Bibliography) Antarctic Cape Evans ENVELOPE(161.550,161.550,-75.100,-75.100) Mount Erebus ENVELOPE(167.167,167.167,-77.533,-77.533) Elementa: Science of the Anthropocene 9 1 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Jacques, C. Sapart, C.J. Fripiat, F. Carnat, G. Zhou, Jiayun Delille, Bruno Röckmann, T van der Veen, C. Niemann, H. Haskell, T. Tison, Jean-Louis Sources and sinks of methane in sea ice: Insights from stable isotopes |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed 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 |
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Article in Journal/Newspaper |
author |
Jacques, C. Sapart, C.J. Fripiat, F. Carnat, G. Zhou, Jiayun Delille, Bruno Röckmann, T van der Veen, C. Niemann, H. Haskell, T. Tison, Jean-Louis |
author_facet |
Jacques, C. Sapart, C.J. Fripiat, F. Carnat, G. Zhou, Jiayun Delille, Bruno Röckmann, T van der Veen, C. Niemann, H. Haskell, T. Tison, Jean-Louis |
author_sort |
Jacques, C. |
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 |
publisher |
BioOne |
publishDate |
2021 |
url |
https://orbi.uliege.be/handle/2268/264693 https://orbi.uliege.be/bitstream/2268/264693/1/elementa.2020.00167.pdf https://doi.org/10.1525/elementa.2020.00167 |
long_lat |
ENVELOPE(161.550,161.550,-75.100,-75.100) ENVELOPE(167.167,167.167,-77.533,-77.533) |
geographic |
Antarctic Cape Evans Mount Erebus |
geographic_facet |
Antarctic Cape Evans Mount Erebus |
genre |
Antarc* Antarctic Antarctica Barrow Sea ice Alaska |
genre_facet |
Antarc* Antarctic Antarctica Barrow Sea ice Alaska |
op_source |
Elementa: Science of the Anthropocene, 9 (1) (2021-10-27) |
op_relation |
https://doi.org/10.1525/elementa.2020.00167 urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/264693 info:hdl:2268/264693 https://orbi.uliege.be/bitstream/2268/264693/1/elementa.2020.00167.pdf doi:10.1525/elementa.2020.00167 scopus-id:2-s2.0-85118304090 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1525/elementa.2020.00167 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766263555061972992 |