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Direct North-South synchronization of abrupt climate change record in ice cores using beryllium 10
1CSNSM/IN2P3/CNRS, Bat 108, 91405 Orsay, France
2IPSL/LSCE, UMR CEA-CNRS-UVSQ, CE Saclay, 91191 Gif-sur-Yvette, France
3Climate and Environmental Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
Abstract. 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.
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Citation: Raisbeck, G. M., Yiou, F., Jouzel, J., and Stocker, T. F.: Direct North-South synchronization of abrupt climate change record in ice cores using beryllium 10, Clim. Past Discuss., 3, 755-769, 2007. Bibtex EndNote Reference Manager
