Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes
The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core has been previously demonstrated using gas measurements (δ18O of O2 and CH4) on a few meters depth scale. However, rapid ice isotopic variations (on the scale of 20 cm) are experienced in the bottom of the GRIP ic...
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ftunivbern:oai:boris.unibe.ch:158300 2023-08-20T04:06:53+02:00 Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes Landais, Amaelle Steffensen, Jørgen Peder Caillon, Nicolas Jouzel, Jean Masson-Delmotte, Valérie Schwander, Jakob 2004 application/pdf https://boris.unibe.ch/158300/1/landais04jgr.pdf https://boris.unibe.ch/158300/ eng eng American Geophysical Union https://boris.unibe.ch/158300/ info:eu-repo/semantics/openAccess Landais, Amaelle; Steffensen, Jørgen Peder; Caillon, Nicolas; Jouzel, Jean; Masson-Delmotte, Valérie; Schwander, Jakob (2004). Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes. Journal of Geophysical Research: Atmospheres, 109(D6), pp. 1-8. American Geophysical Union 10.1029/2003JD004193 <http://dx.doi.org/10.1029/2003JD004193> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2004 ftunivbern https://doi.org/10.1029/2003JD004193 2023-07-31T22:08:01Z The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core has been previously demonstrated using gas measurements (δ18O of O2 and CH4) on a few meters depth scale. However, rapid ice isotopic variations (on the scale of 20 cm) are experienced in the bottom of the GRIP ice core with complex chemical signatures that make them difficult to reconcile with a disturbed stratigraphy of the ice. This is the case for event 5e1, first described as a dramatic cooling 120 kyr BP. We analyzed at a 5 cm resolution the isotopic composition of the air from 2 m of the GRIP bottom ice core covering event 5e1. The δ15N measurements, combined with a basic firn modeling, lead to the solid conclusion that the rapid event 5e1 is not a climatic event. Rapid variations of δ18O of O2 (δ18Oatm) are in agreement with a disturbed ice stratigraphy. However, the double peak shape of the δ18Oatm, recalling chemical data at the same depth, requires processes of diffusion after the mixing or even postcoring, placing limits to the interpretation of some classical paleoclimatic proxies in small scale mixed ice (<1 m). Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project GRIP ice core BORIS (Bern Open Repository and Information System, University of Bern) Greenland Journal of Geophysical Research: Atmospheres 109 D6 n/a n/a |
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 Landais, Amaelle Steffensen, Jørgen Peder Caillon, Nicolas Jouzel, Jean Masson-Delmotte, Valérie Schwander, Jakob Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
topic_facet |
530 Physics |
description |
The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core has been previously demonstrated using gas measurements (δ18O of O2 and CH4) on a few meters depth scale. However, rapid ice isotopic variations (on the scale of 20 cm) are experienced in the bottom of the GRIP ice core with complex chemical signatures that make them difficult to reconcile with a disturbed stratigraphy of the ice. This is the case for event 5e1, first described as a dramatic cooling 120 kyr BP. We analyzed at a 5 cm resolution the isotopic composition of the air from 2 m of the GRIP bottom ice core covering event 5e1. The δ15N measurements, combined with a basic firn modeling, lead to the solid conclusion that the rapid event 5e1 is not a climatic event. Rapid variations of δ18O of O2 (δ18Oatm) are in agreement with a disturbed ice stratigraphy. However, the double peak shape of the δ18Oatm, recalling chemical data at the same depth, requires processes of diffusion after the mixing or even postcoring, placing limits to the interpretation of some classical paleoclimatic proxies in small scale mixed ice (<1 m). |
format |
Article in Journal/Newspaper |
author |
Landais, Amaelle Steffensen, Jørgen Peder Caillon, Nicolas Jouzel, Jean Masson-Delmotte, Valérie Schwander, Jakob |
author_facet |
Landais, Amaelle Steffensen, Jørgen Peder Caillon, Nicolas Jouzel, Jean Masson-Delmotte, Valérie Schwander, Jakob |
author_sort |
Landais, Amaelle |
title |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
title_short |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
title_full |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
title_fullStr |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
title_full_unstemmed |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes |
title_sort |
evidence for stratigraphic distortion in the greenland ice core project (grip) ice core during event 5el (120 kyr bp) from gas isotopes |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
https://boris.unibe.ch/158300/1/landais04jgr.pdf https://boris.unibe.ch/158300/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
op_source |
Landais, Amaelle; Steffensen, Jørgen Peder; Caillon, Nicolas; Jouzel, Jean; Masson-Delmotte, Valérie; Schwander, Jakob (2004). Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5el (120 kyr BP) from gas isotopes. Journal of Geophysical Research: Atmospheres, 109(D6), pp. 1-8. American Geophysical Union 10.1029/2003JD004193 <http://dx.doi.org/10.1029/2003JD004193> |
op_relation |
https://boris.unibe.ch/158300/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2003JD004193 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
109 |
container_issue |
D6 |
container_start_page |
n/a |
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n/a |
_version_ |
1774718235591049216 |