EGU22-4760, updated on 24 May 2023
EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Sequence of events at high resolution during deglaciations over the last 800ka from the EDC ice core

Antoine Grisart1, Amaelle Landais1, Barbara Stenni2, Ilaria Crotti2, Etienne Legrain3, Valérie Masson-Delmotte1, Jean Jouzel1, Fredéric Prié1, Roxanne Jacob1, and Elise Fourré1
Antoine Grisart et al.
  • 1Laboratoire des Sciences Du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
  • 2Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice, Venice, Italy
  • 3Laboratoire de Glaciologie et Géophysique de l’Environnement, CNRS, Université Joseph Fourier-Grenoble, 54 rue Molière BP96, St Martin d’Hères, 38402 France

The EPICA Dome C (EDC) ice core has been drilled from 1996 to 2004. Its study revealed a unique 800 ka long continuous climatic record including 9 deglaciations. Ice cores contain numerous proxies in the ice and in the air trapped in bubbles (chronological constraints, greenhouse gases concentration, local temperature proxies, mid to low latitude climate proxies).

Here, we focus on the link between the high and low latitudes during the glacial/interglacial transitions provided by the isotopic composition of water and oxygen archived in both ice and gas matrix. On one hand, the water isotopic composition brings information on past temperatures and water cycle re-organizations:   dD records past temperature, whereas the combination of d18O with dD or d17O provide information on the past water cycle organization through d-excess and 17O-excess linked to climatic conditions of the evaporative regions. On the other hand, the elemental composition of oxygen expressed in the O2/N2 ratio provides key information for orbital dating over the last 800 ka in complement with the isotopic composition of atmospheric oxygen (d18O of O2 or d18Oatm) which is related as well to the low latitude water cycle.

In this study, we present new high resolution records of water isotopes of many proxies (d18O, d-excess and 17O-excess) as well as high resolution measurements of O2/N2 and d18Oatm over the last 9 deglaciations on the EDC ice core. We detail the coherent low to mid-latitude orbital patterns obtained using our multiproxy approach with a focus on Termination II, Termination V and the 800 – 500 ka. deglaciations. We look at the similar patterns between terminations and between the different proxies presented.

How to cite: Grisart, A., Landais, A., Stenni, B., Crotti, I., Legrain, E., Masson-Delmotte, V., Jouzel, J., Prié, F., Jacob, R., and Fourré, E.: Sequence of events at high resolution during deglaciations over the last 800ka from the EDC ice core, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-4760,, 2022.


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