Physical controls on the storage of methane in landfast sea ice
We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged from 25.9 to 116.4 nmol L−1sw, indicating a supersaturation of 700 to 3100% relative to the atmosphere. In comparison, the CH4 concentrations in s...
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Copernicus Publications
2014
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00019843 2023-05-15T18:16:16+02:00 Physical controls on the storage of methane in landfast sea ice Zhou, J. Tison, J.-L. Carnat, G. Geilfus, N.-X. Delille, B. 2014-06 electronic https://doi.org/10.5194/tc-8-1019-2014 https://noa.gwlb.de/receive/cop_mods_00019843 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00019798/tc-8-1019-2014.pdf https://tc.copernicus.org/articles/8/1019/2014/tc-8-1019-2014.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-8-1019-2014 https://noa.gwlb.de/receive/cop_mods_00019843 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00019798/tc-8-1019-2014.pdf https://tc.copernicus.org/articles/8/1019/2014/tc-8-1019-2014.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2014 ftnonlinearchiv https://doi.org/10.5194/tc-8-1019-2014 2022-02-08T22:52:26Z We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged from 25.9 to 116.4 nmol L−1sw, indicating a supersaturation of 700 to 3100% relative to the atmosphere. In comparison, the CH4 concentrations in sea ice ranged from 3.4 to 17.2 nmol L−1ice and the deduced CH4 concentrations in brine from 13.2 to 677.7 nmol L−1brine. We investigated the processes underlying the difference in CH4 concentrations between sea ice, brine and under-ice water and suggest that biological controls on the storage of CH4 in ice were minor in comparison to the physical controls. Two physical processes regulated the storage of CH4 in our landfast ice samples: bubble formation within the ice and sea ice permeability. Gas bubble formation due to brine concentration and solubility decrease favoured the accumulation of CH4 in the ice at the beginning of ice growth. CH4 retention in sea ice was then twice as efficient as that of salt; this also explains the overall higher CH4 concentrations in brine than in the under-ice water. As sea ice thickened, gas bubble formation became less efficient, CH4 was then mainly trapped in the dissolved state. The increase of sea ice permeability during ice melt marked the end of CH4 storage. Article in Journal/Newspaper Sea ice The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 8 3 1019 1029 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Zhou, J. Tison, J.-L. Carnat, G. Geilfus, N.-X. Delille, B. Physical controls on the storage of methane in landfast sea ice |
topic_facet |
article Verlagsveröffentlichung |
description |
We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged from 25.9 to 116.4 nmol L−1sw, indicating a supersaturation of 700 to 3100% relative to the atmosphere. In comparison, the CH4 concentrations in sea ice ranged from 3.4 to 17.2 nmol L−1ice and the deduced CH4 concentrations in brine from 13.2 to 677.7 nmol L−1brine. We investigated the processes underlying the difference in CH4 concentrations between sea ice, brine and under-ice water and suggest that biological controls on the storage of CH4 in ice were minor in comparison to the physical controls. Two physical processes regulated the storage of CH4 in our landfast ice samples: bubble formation within the ice and sea ice permeability. Gas bubble formation due to brine concentration and solubility decrease favoured the accumulation of CH4 in the ice at the beginning of ice growth. CH4 retention in sea ice was then twice as efficient as that of salt; this also explains the overall higher CH4 concentrations in brine than in the under-ice water. As sea ice thickened, gas bubble formation became less efficient, CH4 was then mainly trapped in the dissolved state. The increase of sea ice permeability during ice melt marked the end of CH4 storage. |
format |
Article in Journal/Newspaper |
author |
Zhou, J. Tison, J.-L. Carnat, G. Geilfus, N.-X. Delille, B. |
author_facet |
Zhou, J. Tison, J.-L. Carnat, G. Geilfus, N.-X. Delille, B. |
author_sort |
Zhou, J. |
title |
Physical controls on the storage of methane in landfast sea ice |
title_short |
Physical controls on the storage of methane in landfast sea ice |
title_full |
Physical controls on the storage of methane in landfast sea ice |
title_fullStr |
Physical controls on the storage of methane in landfast sea ice |
title_full_unstemmed |
Physical controls on the storage of methane in landfast sea ice |
title_sort |
physical controls on the storage of methane in landfast sea ice |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1019-2014 https://noa.gwlb.de/receive/cop_mods_00019843 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00019798/tc-8-1019-2014.pdf https://tc.copernicus.org/articles/8/1019/2014/tc-8-1019-2014.pdf |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-8-1019-2014 https://noa.gwlb.de/receive/cop_mods_00019843 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00019798/tc-8-1019-2014.pdf https://tc.copernicus.org/articles/8/1019/2014/tc-8-1019-2014.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-8-1019-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
3 |
container_start_page |
1019 |
op_container_end_page |
1029 |
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1766189784749834240 |