A tentative reconstruction of the last interglacial and glacial inception in Greenland based on new gas measurements in the Greenland Ice Core Project (GRIP) ice core

The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core prevents direct access to climatic information older than 110 kyr. This is especially regretful since this period covers the previous interglacial corresponding to marine isotopic stage 5e (MIS 5e, 130–120 kyr B.P...

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Bibliographic Details
Published in:Journal of Geophysical Research
Main Authors: Landais, Amaelle, Chappellaz, Jérôme, Delmotte, Marc, Jouzel, Jean, Blunier, Thomas, Bourg, Christine, Caillon, Nicolas, Cherrier, Stéphane, Malaizé, Bruno, Masson-Delmotte, Valérie, Raynaud, Dominique, Schwander, Jakob, Steffensen, Jørgen Peder
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2003
Subjects:
530 Physics
Antarctic
Greenland
Antarc*
Antarctica
Greenland ice core
Greenland Ice core Project
GRIP
ice core
Online Access:https://boris.unibe.ch/158295/1/landais03jgr.pdf
https://boris.unibe.ch/158295/
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Summary:The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core prevents direct access to climatic information older than 110 kyr. This is especially regretful since this period covers the previous interglacial corresponding to marine isotopic stage 5e (MIS 5e, 130–120 kyr B.P.). Here we present a tentative reconstruction of the disturbed GRIP chronology based on the succession of globally well mixed gas parameters. The GRIP δ18Oice chronological sequence is obtained by comparing a new set of δ18O of atmospheric O2 and CH4 measurements from the bottom section of the GRIP core with their counterpart in the Vostok Antarctic profiles. This comparison clearly identifies ice from the penultimate glacial maximum (MIS 6, 190–130 kyr B.P.) in the GRIP core. Further it allows rough reconstruction of the last interglacial period and of the last glacial inception in Greenland which appears to lay its Antarctic counterpart. Our data suggest that while Antarctica is already entering into a glaciation, Greenland is still experiencing a warm maximum during MIS 5e.

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