Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 13, 217-229, 2017
https://doi.org/10.5194/cp-13-217-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
10 Mar 2017
An improved north–south synchronization of ice core records around the 41 kyr 10Be peak
Grant M. Raisbeck1, Alexandre Cauquoin2, Jean Jouzel2, Amaelle Landais2, Jean-Robert Petit3, Vladimir Y. Lipenkov4, Juerg Beer5, Hans-Arno Synal6, Hans Oerter7, Sigfus J. Johnsen8,†, Jorgen P. Steffensen8, Anders Svensson8, and Françoise Yiou1 1CSNSM, CNRS, Université Paris-Saclay, Bats 104–108, 91405 Campus, Orsay, France
2LSCE/IPSL, CEA-CNRS-UVSQ), CEA Saclay Orme des Merisiers, 91191 Gif-sur-Yvette, France
3LGGE, CNRS, BP 96, 38402, St Martin d'Hères CEDEX, France
4Arctic and Antarctic Research Institute, 38 Bering St., St. Petersburg 199397, Russia
5Eawag, Überlandstrasse 133, Postfach 611, 8600 Dübendorf, Switzerland
6Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
7Alfred Wegener Institute for Polar and Marine Research, 27570 Bremerhaven, Germany
8Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
deceased
Abstract. Using new high-resolution 10Be measurements in the NGRIP, EDML and Vostok ice cores, together with previously published data from EDC, we present an improved synchronization between Greenland and Antarctic ice cores during the Laschamp geomagnetic excursion  ∼  41 kyr ago. We estimate the precision of this synchronization to be ±20 years, an order of magnitude better than previous work. We discuss the implications of this new synchronization for making improved estimates of the depth difference between ice and enclosed gas of the same age (Δdepth), difference between age of ice and enclosed gas at the same depth (Δage) in the EDC and EDML ice cores, spectral properties of the 10Be profiles and phasing between Dansgaard–Oeschger-10 (in NGRIP) and AIM-10 (in EDML and EDC).

Citation: Raisbeck, G. M., Cauquoin, A., Jouzel, J., Landais, A., Petit, J.-R., Lipenkov, V. Y., Beer, J., Synal, H.-A., Oerter, H., Johnsen, S. J., Steffensen, J. P., Svensson, A., and Yiou, F.: An improved north–south synchronization of ice core records around the 41 kyr 10Be peak, Clim. Past, 13, 217-229, https://doi.org/10.5194/cp-13-217-2017, 2017.
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Short summary
Using records of a long-lived radioactive nuclide (10Be) that is formed globally in the atmosphere and deposited within a few years to the earth’s surface, we have synchronized three Antarctic ice cores to one from Greenland. This permits the climate and other environmental parameters registered in these ice cores to be put on a common timescale with a precision of a few decades, thus allowing different models and mechanisms associated with these parameters to be tested with the same precision.
Using records of a long-lived radioactive nuclide (10Be) that is formed globally in the...
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