- 1Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
- 2ETH Zurich, Laboratory of Ion Beam Physics, Zurich, Switzerland
- 3CEREGE, Aix-Marseille University, CNRS, IRD, INRAE, Collège de France, Technopôle de l’Arbois, Aix-en-Provence, France
- 4IMBE, Aix-Marseille University, CNRS, IRD, Avignon University, Technopôle de l’Arbois, Aix-en-Provence
- 5Department of Geography, Johannes Gutenberg University, Mainz, Germany
- 6ETH Zurich, Forest Ecology, Institute of Terrestrial Ecosystems, Department of Environmental Systems Science, Zurich, Switzerland
The longest absolute tree-ring chronology is extended by the Swiss Late Glacial chronology back to about 14 000 BP (years before 1950) with an uncertainty of only 8 years (2-sig, Reinig 2020). Recently published chronologies from Southern France (Bard et al. 2023) extend the Swiss chronologies throughout the Older Dryas further back to 14 350 BP. However, an accurate placement of the mid-resolution (1yr ever 3yr) French radiocarbon chronologies is so far not available and purely base on low-resolution Swiss radiocarbon measurements.
By performing stable isotope (δ18O and δ13C) measurements on French and Swiss trees and additional annual-resolution radiocarbon measurements, we will present a new accurate dating of the French chronologies. We suggest a link between Switzerland and France based on stable isotope signatures, that agrees with the new high-resolution radiocarbon measurement. The evidence of the new placement based on the new multi-proxy approach will be given.
Bard, E. et al. A radiocarbon spike at 14 300 cal yr BP in subfossil trees provides the impulse response function of the global carbon cycle during the Late Glacial. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 381 (2023). https://doi.org/10.1098/rsta.2022.0206
Reinig, F. et al. Illuminating Intcal during the Younger Dryas. Radiocarbon 62, 883-889 (2020). https://doi.org/10.1017/Rdc.2020.15
How to cite: Staub, S., Wacker, L., Bard, E., Fonti, P., Guibal, F., Marschal, C., Miramont, C., Nievergelt, D., Reinig, F., Rigling, A., Rostek, F., Saurer, M., Verstege, A., and Treydte, K.: Multi-proxy tree ring analysis to improve the dating around the Older Dryas , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-20027, https://doi.org/10.5194/egusphere-egu25-20027, 2025.
