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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ftdatacite:10.48350/158300 2023-05-15T16:27:59+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 https://dx.doi.org/10.48350/158300 https://boris.unibe.ch/158300/ unknown American Geophysical Union open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 530 Physics Text article-journal journal article ScholarlyArticle 2004 ftdatacite https://doi.org/10.48350/158300 2021-11-05T12:55:41Z 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). Text Greenland Greenland ice core Greenland Ice core Project GRIP ice core DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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530 Physics |
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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 |
Text |
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://dx.doi.org/10.48350/158300 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_rights |
open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.48350/158300 |
_version_ |
1766017597919199232 |