Direct North-South synchronization of abrupt climate change record in ice cores using beryllium 10

G. M. Raisbeck (1) , F. Yiou (1) , Jean Jouzel (2) , T. F. Stocker (3)

1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 IPSL - Institut Pierre-Simon-Laplace
3 CEP - Climate and Environmental Physics [Bern]

A new, decadally resolved record of the ¹⁰Be peak at 41 kyr from the EPICA Dome C ice core (Antarctica) is used to match it with the same peak in the GRIP ice core (Greenland). This permits a direct synchronisation of the climatic variations around 41 kyr BP, independent of uncertainties related to the ice age-gas age difference in ice cores. Dansgaard-Oeschger event 10 is in the period of best synchronisation and is found to be coeval with an Antarctic temperature maximum. Simulations using a thermal bipolar seesaw model agree reasonably well with the observed relative climate chronology in these two cores. They also reproduce three Antarctic warming events between A1 and A2.

Domaines: Interfaces continentales, environnement; Sciences de la Terre

G. M. Raisbeck, F. Yiou, Jean Jouzel, T. F. Stocker. Direct North-South synchronization of abrupt climate change record in ice cores using beryllium 10. Climate of the Past Discussions, 2007, 3 (3), pp.755-769. ⟨hal-00330733⟩