Articles | Volume 13, issue 3
Clim. Past, 13, 217–229, 2017

Special issue: International Partnerships in Ice Core Sciences (IPICS) Second...

Clim. Past, 13, 217–229, 2017

Research article 10 Mar 2017

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 Grant M. Raisbeck et al.
  • 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).

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.