TALDICE-1 age scale of the Talos Dome deep ice core, East Antarctica

Daphné Buiron (1) , Jérôme Chappellaz (1) , Barbara Stenni (2) , Massimo Frezzotti (3) , Matthias Baumgartner (4) , Emilie Capron (5) , Amaëlle Landais (5, 6) , Bénédicte Lemieux-Dudon (7) , Valérie Masson-Delmotte (5, 6) , Maurine Montagnat (8) , Frédéric Parrenin (9) , Adrian Schilt (10)

1 CLIPS
2 Dipartimento di Scienze Geologiche [Trieste]
3 ENEA - Italian National agency for new technologies, Energy and sustainable economic development [Frascati]
4 CEP - Climate and Environmental Physics [Bern]
5 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
6 GLACCIOS - Glaces et Continents, Climats et Isotopes Stables
7 MOISE - Modelling, Observations, Identification for Environmental Sciences
8 EDGe
9 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
10 OCCR - Oeschger Centre for Climate Change Research

A new deep ice core drilling program, TALDICE, has been successfully handled by a European team at Talos Dome, in the Ross Sea sector of East Antarctica, down to 1620 m depth. Using stratigraphic markers and a new inverse method, we produce the first official chronology of the ice core, called TALDICE-1. We show that it notably improves an a priori chronology resulting from a one-dimensional ice flow model. It is in agreement with a posteriori controls of the resulting accumulation rate and thinning function along the core. An absolute uncertainty of only 300 yr is obtained over the course of the last deglaciation. This uncertainty remains lower than 600 yr over Marine Isotope Stage 3, back to 50 kyr BP. The phasing of the TALDICE ice core climate record with respect to the central East Antarctic plateau and Greenland records can thus be determined with a precision allowing for a discussion of the mechanisms at work at sub-millennial time scales.

Domains: Geomorphology

Daphné Buiron, Jérôme Chappellaz, Barbara Stenni, Massimo Frezzotti, Matthias Baumgartner, et al.. TALDICE-1 age scale of the Talos Dome deep ice core, East Antarctica. Climate of the Past, 2011, 7 (1), pp.1-16. ⟨10.5194/cp-7-1-2011⟩. ⟨insu-00649642⟩