EGU21-14405, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Progress on absolute dating of ice cores with Argon isotopes

Anais Orsi1,2, Ilaria Crotti1,3, Roxanne Jacob1, Amaelle Landais1, and Elise Fourré1
Anais Orsi 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 Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
  • 3Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice, Italy

In the search for very old ice, finding the age of the ice is a key parameter necessary for its interpretation. Most ice core dating method are based on chronological markers that require the ice to be in stratigraphic order. However, the oldest ice is likely to be found at the bottom of ice sheets, where the stratigraphy is disturbed, or in ablation areas, where the classical methods cannot be used. Absolute dating techniques have recently been developed to provide new constraints on the age of old ice, but their development in the context of ice cores is limited by the large sample size required. Here, we discuss the analytical performances of a new technique for 40Ar dating, which allows us to provide a reliable age with 80g of ice rather than 800g, as previously published. We present an application to the dating of the bottom of the TALDICE and Dome C ice cores. This method represents a significant advance for its application to the very precious ice at the bottom of ice cores.

How to cite: Orsi, A., Crotti, I., Jacob, R., Landais, A., and Fourré, E.: Progress on absolute dating of ice cores with Argon isotopes, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14405,, 2021.


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