Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters
Under present-day climatic conditions the air content of ice shows a high sensitivity to the atmospheric pressure and hence to the elevation at the surface of the ice sheet. This observation has been used to infer past ice sheet thickness variations of Antarctica and Greenland. A high-resolution air...
Published in: | Journal of Geophysical Research |
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Washington, American Geophysical Union (AGU)
2022
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Online Access: | https://doi.org/10.1029/93jd03223 http://infoscience.epfl.ch/record/298271 |
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ftinfoscience:oai:infoscience.epfl.ch:298271 2023-05-15T13:43:17+02:00 Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters Martinerie, P. Lipenkov, Vy Raynaud, D. Chappellaz, J. Barkov, Ni Lorius, C. 2022-11-23T16:11:00Z https://doi.org/10.1029/93jd03223 http://infoscience.epfl.ch/record/298271 unknown Washington, American Geophysical Union (AGU) doi:10.1029/93jd03223 isi:A1994NN51700021 http://infoscience.epfl.ch/record/298271 http://infoscience.epfl.ch/record/298271 Text 2022 ftinfoscience https://doi.org/10.1029/93jd03223 2023-02-13T23:12:29Z Under present-day climatic conditions the air content of ice shows a high sensitivity to the atmospheric pressure and hence to the elevation at the surface of the ice sheet. This observation has been used to infer past ice sheet thickness variations of Antarctica and Greenland. A high-resolution air content profile (more than 1000 measurements) covering approximately the last 200 000 years was obtained along the 2546-m long Vostok ice core. Three analytical techniques were used, leading to consistent results which show large amplitude and rapid air content variations. The Vostok results support thicker/thinner ice in the central part of East Antarctica during warm/cold periods. Apart from ice thickness changes, the two other potential sources of air content variations are atmospheric pressure and ice porous volume at the air isolation level, but these do not explain all the variation. Wind speed changes by about 7 m s-1 could be the source of the large and rapid air content variations observed during glacial stages. -from Authors Text Antarc* Antarctica East Antarctica Greenland ice core Ice Sheet EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) East Antarctica Greenland Journal of Geophysical Research 99 D5 10565 |
institution |
Open Polar |
collection |
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
op_collection_id |
ftinfoscience |
language |
unknown |
description |
Under present-day climatic conditions the air content of ice shows a high sensitivity to the atmospheric pressure and hence to the elevation at the surface of the ice sheet. This observation has been used to infer past ice sheet thickness variations of Antarctica and Greenland. A high-resolution air content profile (more than 1000 measurements) covering approximately the last 200 000 years was obtained along the 2546-m long Vostok ice core. Three analytical techniques were used, leading to consistent results which show large amplitude and rapid air content variations. The Vostok results support thicker/thinner ice in the central part of East Antarctica during warm/cold periods. Apart from ice thickness changes, the two other potential sources of air content variations are atmospheric pressure and ice porous volume at the air isolation level, but these do not explain all the variation. Wind speed changes by about 7 m s-1 could be the source of the large and rapid air content variations observed during glacial stages. -from Authors |
format |
Text |
author |
Martinerie, P. Lipenkov, Vy Raynaud, D. Chappellaz, J. Barkov, Ni Lorius, C. |
spellingShingle |
Martinerie, P. Lipenkov, Vy Raynaud, D. Chappellaz, J. Barkov, Ni Lorius, C. Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
author_facet |
Martinerie, P. Lipenkov, Vy Raynaud, D. Chappellaz, J. Barkov, Ni Lorius, C. |
author_sort |
Martinerie, P. |
title |
Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
title_short |
Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
title_full |
Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
title_fullStr |
Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
title_full_unstemmed |
Air content paleo record in the Vostok ice core (Antarctica): a mixed record of climatic and glaciological parameters |
title_sort |
air content paleo record in the vostok ice core (antarctica): a mixed record of climatic and glaciological parameters |
publisher |
Washington, American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://doi.org/10.1029/93jd03223 http://infoscience.epfl.ch/record/298271 |
geographic |
East Antarctica Greenland |
geographic_facet |
East Antarctica Greenland |
genre |
Antarc* Antarctica East Antarctica Greenland ice core Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Greenland ice core Ice Sheet |
op_source |
http://infoscience.epfl.ch/record/298271 |
op_relation |
doi:10.1029/93jd03223 isi:A1994NN51700021 http://infoscience.epfl.ch/record/298271 |
op_doi |
https://doi.org/10.1029/93jd03223 |
container_title |
Journal of Geophysical Research |
container_volume |
99 |
container_issue |
D5 |
container_start_page |
10565 |
_version_ |
1766186754207907840 |