First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice
We report bulk gas concentrations of O2, N2, and Ar, as well as their transport coefficients, in natural landfast subarctic sea ice in southwest Greenland. The observed bulk ice gas composition was 27.5% O2, 71.4% N2, and 1.09% Ar. Most previous studies suggest that convective transport is the main...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/70480/ https://doi.org/10.1002/2014JC009849 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:70480 2023-05-15T16:29:38+02:00 First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice Crabeck, Odile Delille, B. Rysgaard, S. Thomas, D. N. Geilfus, N. X. Else, B. Tison, J. L. 2014-10-01 https://ueaeprints.uea.ac.uk/id/eprint/70480/ https://doi.org/10.1002/2014JC009849 unknown Crabeck, Odile, Delille, B., Rysgaard, S., Thomas, D. N., Geilfus, N. X., Else, B. and Tison, J. L. (2014) First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice. Journal of Geophysical Research: Oceans, 119 (10). pp. 6655-6668. ISSN 2169-9275 doi:10.1002/2014JC009849 Article PeerReviewed 2014 ftuniveastangl https://doi.org/10.1002/2014JC009849 2023-01-30T21:50:05Z We report bulk gas concentrations of O2, N2, and Ar, as well as their transport coefficients, in natural landfast subarctic sea ice in southwest Greenland. The observed bulk ice gas composition was 27.5% O2, 71.4% N2, and 1.09% Ar. Most previous studies suggest that convective transport is the main driver of gas displacement in sea ice and have neglected diffusion processes. According to our data, brines were stratified within the ice, so that no convective transport could occur within the brine system. Therefore, diffusive transport was the main driver of gas migration. By analyzing the temporal evolution of an internal gas peak within the ice, we deduced the bulk gas transport coefficients for oxygen (DO2), argon (DAr), and nitrogen (DN2). The values fit to the few existing estimates from experimental work, and are close to the diffusivity values in water (10-5 cm2 s-1). We suggest that gas bubbles escaping from the brine to the atmosphereas the ice gets more permeable during meltcould be responsible for the previously reported high transport coefficients. These results underline that when there is no convective transport within the sea ice, the transport of gas by diffusion through the brines, either in the liquid or gaseous phases, is a major factor in controlling the ocean-atmosphere exchange. Article in Journal/Newspaper Greenland Sea ice Subarctic University of East Anglia: UEA Digital Repository Greenland Journal of Geophysical Research: Oceans 119 10 6655 6668 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
unknown |
description |
We report bulk gas concentrations of O2, N2, and Ar, as well as their transport coefficients, in natural landfast subarctic sea ice in southwest Greenland. The observed bulk ice gas composition was 27.5% O2, 71.4% N2, and 1.09% Ar. Most previous studies suggest that convective transport is the main driver of gas displacement in sea ice and have neglected diffusion processes. According to our data, brines were stratified within the ice, so that no convective transport could occur within the brine system. Therefore, diffusive transport was the main driver of gas migration. By analyzing the temporal evolution of an internal gas peak within the ice, we deduced the bulk gas transport coefficients for oxygen (DO2), argon (DAr), and nitrogen (DN2). The values fit to the few existing estimates from experimental work, and are close to the diffusivity values in water (10-5 cm2 s-1). We suggest that gas bubbles escaping from the brine to the atmosphereas the ice gets more permeable during meltcould be responsible for the previously reported high transport coefficients. These results underline that when there is no convective transport within the sea ice, the transport of gas by diffusion through the brines, either in the liquid or gaseous phases, is a major factor in controlling the ocean-atmosphere exchange. |
format |
Article in Journal/Newspaper |
author |
Crabeck, Odile Delille, B. Rysgaard, S. Thomas, D. N. Geilfus, N. X. Else, B. Tison, J. L. |
spellingShingle |
Crabeck, Odile Delille, B. Rysgaard, S. Thomas, D. N. Geilfus, N. X. Else, B. Tison, J. L. First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
author_facet |
Crabeck, Odile Delille, B. Rysgaard, S. Thomas, D. N. Geilfus, N. X. Else, B. Tison, J. L. |
author_sort |
Crabeck, Odile |
title |
First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
title_short |
First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
title_full |
First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
title_fullStr |
First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
title_full_unstemmed |
First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice |
title_sort |
first in situ'' determination of gas transport coefficients (do2, dar, and dn 2) from bulk gas concentration measurements (o2, n2, ar) in natural sea ice |
publishDate |
2014 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/70480/ https://doi.org/10.1002/2014JC009849 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Sea ice Subarctic |
genre_facet |
Greenland Sea ice Subarctic |
op_relation |
Crabeck, Odile, Delille, B., Rysgaard, S., Thomas, D. N., Geilfus, N. X., Else, B. and Tison, J. L. (2014) First in situ'' determination of gas transport coefficients (DO2, DAr, and DN 2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice. Journal of Geophysical Research: Oceans, 119 (10). pp. 6655-6668. ISSN 2169-9275 doi:10.1002/2014JC009849 |
op_doi |
https://doi.org/10.1002/2014JC009849 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
10 |
container_start_page |
6655 |
op_container_end_page |
6668 |
_version_ |
1766019349371420672 |