EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Absolute dating of deep ice cores with argon and krypton isotopes.

Amaelle Landais1, Anaïs Orsi Orsi1, Elise Fourré Fourré1, Roxanne Jacob1, Ilaria Crotti1,2, Florian Ritterbusch3, Zheng-Tian Lu3, Guo-Min Yang3, and Wei Jiang3
Amaelle Landais et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
  • 2Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University, Venice, 30172, Italy
  • 3University of Science and Technology of China, Hefei, 230026, China

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 methods 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. In particular, 81Kr measurements provide strong dating constraints for the old ice cores. Still, these measurements are limited in deep ice cores because of the large sample size required (5-6 kg). In addition to 81Kr dating, we discuss here 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. Finally, we present two applications for the 81Kr and 40Ar dating on the bottom of the TALDICE and Dome C ice cores.

How to cite: Landais, A., Orsi, A. O., Fourré, E. F., Jacob, R., Crotti, I., Ritterbusch, F., Lu, Z.-T., Yang, G.-M., and Jiang, W.: Absolute dating of deep ice cores with argon and krypton isotopes., EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-13260,, 2022.