Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion
Polar ice cores are unique archives for ancient air. However, a loss of air due to molecular diffusion during storage could affect the composition of the remaining air. We formulate a model with a high spatial resolution (1 mm) calculating the loss of N2, O2 and CO2 in pure clathrate ice in order to...
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Language: | English |
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American Geophysical Union
2009
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Online Access: | https://boris.unibe.ch/37491/1/bereiter09grl.pdf https://boris.unibe.ch/37491/ |
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ftunivbern:oai:boris.unibe.ch:37491 2023-08-20T04:07:11+02:00 Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion Bereiter, Bernhard Schwander, J. Lüthi, D. Stocker, Thomas F. 2009 application/pdf https://boris.unibe.ch/37491/1/bereiter09grl.pdf https://boris.unibe.ch/37491/ eng eng American Geophysical Union https://boris.unibe.ch/37491/ info:eu-repo/semantics/openAccess Bereiter, Bernhard; Schwander, J.; Lüthi, D.; Stocker, Thomas F. (2009). Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion. Geophysical Research Letters, 36(5) Washington, D.C.: American Geophysical Union 10.1029/2008GL036737 <http://dx.doi.org/10.1029/2008GL036737> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2009 ftunivbern https://doi.org/10.1029/2008GL036737 2023-07-31T20:59:35Z Polar ice cores are unique archives for ancient air. However, a loss of air due to molecular diffusion during storage could affect the composition of the remaining air. We formulate a model with a high spatial resolution (1 mm) calculating the loss of N2, O2 and CO2 in pure clathrate ice in order to determine which layers of an ice core are affected by significant changes in the CO2 concentration and the δ(O2/N2) ratio for storage durations up to 38 years. The results agree with experimental δ(O2/N2) measurements at ice core pieces performed after different storage durations. Additionally, the calculations confirm the importance of the storage temperature and show that the CO2 concentration is less affected than that of δ(O2/N2). Furthermore, guidelines for ice core sample preparation are provided in dependence of storage duration and temperature. Article in Journal/Newspaper ice core BORIS (Bern Open Repository and Information System, University of Bern) Geophysical Research Letters 36 5 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
description |
Polar ice cores are unique archives for ancient air. However, a loss of air due to molecular diffusion during storage could affect the composition of the remaining air. We formulate a model with a high spatial resolution (1 mm) calculating the loss of N2, O2 and CO2 in pure clathrate ice in order to determine which layers of an ice core are affected by significant changes in the CO2 concentration and the δ(O2/N2) ratio for storage durations up to 38 years. The results agree with experimental δ(O2/N2) measurements at ice core pieces performed after different storage durations. Additionally, the calculations confirm the importance of the storage temperature and show that the CO2 concentration is less affected than that of δ(O2/N2). Furthermore, guidelines for ice core sample preparation are provided in dependence of storage duration and temperature. |
format |
Article in Journal/Newspaper |
author |
Bereiter, Bernhard Schwander, J. Lüthi, D. Stocker, Thomas F. |
spellingShingle |
Bereiter, Bernhard Schwander, J. Lüthi, D. Stocker, Thomas F. Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
author_facet |
Bereiter, Bernhard Schwander, J. Lüthi, D. Stocker, Thomas F. |
author_sort |
Bereiter, Bernhard |
title |
Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
title_short |
Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
title_full |
Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
title_fullStr |
Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
title_full_unstemmed |
Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion |
title_sort |
change in co2 concentration and o2/n2 ratio in ice cores due to molecular diffusion |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
https://boris.unibe.ch/37491/1/bereiter09grl.pdf https://boris.unibe.ch/37491/ |
genre |
ice core |
genre_facet |
ice core |
op_source |
Bereiter, Bernhard; Schwander, J.; Lüthi, D.; Stocker, Thomas F. (2009). Change in CO2 concentration and O2/N2 ratio in ice cores due to molecular diffusion. Geophysical Research Letters, 36(5) Washington, D.C.: American Geophysical Union 10.1029/2008GL036737 <http://dx.doi.org/10.1029/2008GL036737> |
op_relation |
https://boris.unibe.ch/37491/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2008GL036737 |
container_title |
Geophysical Research Letters |
container_volume |
36 |
container_issue |
5 |
_version_ |
1774718646731407360 |