CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores
CO2 measurements on the EPICA (European Project for Ice Coring in Antarctica) DML ice core in depth levels just below the bubble ice–clathrate ice transformation zone (1230–2240 m depth) were performed. In the youngest part (1230–1600 m), they reveal variations of up to 25 ppmv around the mean atmos...
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ftunivbern:oai:boris.unibe.ch:4599 2023-08-20T04:01:40+02:00 CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores Lüthi, Dieter Bereiter, Bernhard Stauffer, Bernhard Winkler, Renato Schwander, Jakob Kindler, Philippe Leuenberger, Markus Kipfstuhl, Sepp Capron, Emilie Landais, Amaelle Fischer, Hubertus Stocker, Thomas F. 2010 application/pdf https://boris.unibe.ch/4599/1/1-s2.0-S0012821X10003985-main.pdf https://boris.unibe.ch/4599/ eng eng Elsevier https://boris.unibe.ch/4599/ info:eu-repo/semantics/restrictedAccess Lüthi, Dieter; Bereiter, Bernhard; Stauffer, Bernhard; Winkler, Renato; Schwander, Jakob; Kindler, Philippe; Leuenberger, Markus; Kipfstuhl, Sepp; Capron, Emilie; Landais, Amaelle; Fischer, Hubertus; Stocker, Thomas F. (2010). CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores. Earth and planetary science letters, 297(1-2), pp. 226-233. Amsterdam: Elsevier 10.1016/j.epsl.2010.06.023 <http://dx.doi.org/10.1016/j.epsl.2010.06.023> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2010 ftunivbern https://doi.org/10.1016/j.epsl.2010.06.023 2023-07-31T20:26:53Z CO2 measurements on the EPICA (European Project for Ice Coring in Antarctica) DML ice core in depth levels just below the bubble ice–clathrate ice transformation zone (1230–2240 m depth) were performed. In the youngest part (1230–1600 m), they reveal variations of up to 25 ppmv around the mean atmospheric concentration within centimetres, corresponding to a snow deposition interval of a few years. Similar results are found at corresponding depth regions of the Dome C and the Talos Dome ice cores. Since we can exclude all hitherto known processes altering the concentration of CO2 in ice cores, we present a hypothesis about spatial fractionation of air components related to episodically increasing clathrate formation followed by diffusion processes from bubbles to clathrates. This hypothesis is supported by optical line-scan observations and by O2/N2 measurements at the same depth where strong CO2 variations are detected. Below the clathrate formation zone, this small-scale fractionation process is slowly smoothed out, most likely by diffusion, regaining the initial mean atmospheric concentration. Although this process compromises the representativeness of a single CO2 measurement on small ice samples in the clathrate formation zone of an ice core, it does not affect the mean atmospheric CO2 concentration if CO2 values are averaged over a sufficiently long depth scale (> 10 cm in case of the EPICA DML ice core). Article in Journal/Newspaper Antarc* Antarctic Antarctica DML EPICA ice core BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Earth and Planetary Science Letters 297 1-2 226 233 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Lüthi, Dieter Bereiter, Bernhard Stauffer, Bernhard Winkler, Renato Schwander, Jakob Kindler, Philippe Leuenberger, Markus Kipfstuhl, Sepp Capron, Emilie Landais, Amaelle Fischer, Hubertus Stocker, Thomas F. CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
topic_facet |
530 Physics |
description |
CO2 measurements on the EPICA (European Project for Ice Coring in Antarctica) DML ice core in depth levels just below the bubble ice–clathrate ice transformation zone (1230–2240 m depth) were performed. In the youngest part (1230–1600 m), they reveal variations of up to 25 ppmv around the mean atmospheric concentration within centimetres, corresponding to a snow deposition interval of a few years. Similar results are found at corresponding depth regions of the Dome C and the Talos Dome ice cores. Since we can exclude all hitherto known processes altering the concentration of CO2 in ice cores, we present a hypothesis about spatial fractionation of air components related to episodically increasing clathrate formation followed by diffusion processes from bubbles to clathrates. This hypothesis is supported by optical line-scan observations and by O2/N2 measurements at the same depth where strong CO2 variations are detected. Below the clathrate formation zone, this small-scale fractionation process is slowly smoothed out, most likely by diffusion, regaining the initial mean atmospheric concentration. Although this process compromises the representativeness of a single CO2 measurement on small ice samples in the clathrate formation zone of an ice core, it does not affect the mean atmospheric CO2 concentration if CO2 values are averaged over a sufficiently long depth scale (> 10 cm in case of the EPICA DML ice core). |
format |
Article in Journal/Newspaper |
author |
Lüthi, Dieter Bereiter, Bernhard Stauffer, Bernhard Winkler, Renato Schwander, Jakob Kindler, Philippe Leuenberger, Markus Kipfstuhl, Sepp Capron, Emilie Landais, Amaelle Fischer, Hubertus Stocker, Thomas F. |
author_facet |
Lüthi, Dieter Bereiter, Bernhard Stauffer, Bernhard Winkler, Renato Schwander, Jakob Kindler, Philippe Leuenberger, Markus Kipfstuhl, Sepp Capron, Emilie Landais, Amaelle Fischer, Hubertus Stocker, Thomas F. |
author_sort |
Lüthi, Dieter |
title |
CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
title_short |
CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
title_full |
CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
title_fullStr |
CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
title_full_unstemmed |
CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores |
title_sort |
co2 and o2/n2 variations in and just below the bubble–clathrate transformation zone of antarctic ice cores |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://boris.unibe.ch/4599/1/1-s2.0-S0012821X10003985-main.pdf https://boris.unibe.ch/4599/ |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
Antarctic Talos Dome |
geographic_facet |
Antarctic Talos Dome |
genre |
Antarc* Antarctic Antarctica DML EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica DML EPICA ice core |
op_source |
Lüthi, Dieter; Bereiter, Bernhard; Stauffer, Bernhard; Winkler, Renato; Schwander, Jakob; Kindler, Philippe; Leuenberger, Markus; Kipfstuhl, Sepp; Capron, Emilie; Landais, Amaelle; Fischer, Hubertus; Stocker, Thomas F. (2010). CO2 and O2/N2 variations in and just below the bubble–clathrate transformation zone of Antarctic ice cores. Earth and planetary science letters, 297(1-2), pp. 226-233. Amsterdam: Elsevier 10.1016/j.epsl.2010.06.023 <http://dx.doi.org/10.1016/j.epsl.2010.06.023> |
op_relation |
https://boris.unibe.ch/4599/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2010.06.023 |
container_title |
Earth and Planetary Science Letters |
container_volume |
297 |
container_issue |
1-2 |
container_start_page |
226 |
op_container_end_page |
233 |
_version_ |
1774724912701767680 |