Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores

Bazin, Lucie; Landais, Amaelle; Capron, Emilie; Masson-Delmotte, Valérie; Ritz, Catherine; Picard, Ghislain; Jouzel, Jean; Dumont, Marie; Leuenberger, Markus; Prié, Frédéric

doi:10.5194/cp-12-729-2016

Articles | Volume 12, issue 3

https://doi.org/10.5194/cp-12-729-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/cp-12-729-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 12, issue 3

Research article

|

22 Mar 2016

Research article |

| 22 Mar 2016

Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores

Lucie Bazin, Amaelle Landais, Emilie Capron, Valérie Masson-Delmotte, Catherine Ritz, Ghislain Picard, Jean Jouzel, Marie Dumont, Markus Leuenberger, and Frédéric Prié

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Latest update: 25 Nov 2025

Short summary

We present new measurements of δO₂⁄N₂ and δ¹⁸O_atm performed on well-conserved ice from EDC covering MIS5 and between 380 and 800 ka. The combination of the observation of a 100 ka periodicity in the new δO₂⁄N₂ record with a MIS5 multi-site multi-proxy study has revealed a potential influence of local climatic parameters on δO₂⁄N₂. Moreover, we propose that the varying delay between d18Oatm and precession for the last 800 ka is affected by the occurrence of ice sheet discharge events.