An improved north–south synchronization of ice core records around the 41 kyr $^{10}$Be peak

Grant M. Raisbeck (1) , Alexandre Cauquoin (2) , Jean Jouzel (2, 3) , Amaëlle Landais (2, 3) , Jean-Robert Petit (4) , Vladimir Y. Lipenkov (5) , Juerg Beer (6) , Hans-Arno Synal (7) , Hans Oerter (8) , Sigfus J. Johnsen (9) , Jorgen P. Steffensen (9) , Anders Svensson (9) , Françoise Yiou (1)

1 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
3 GLACCIOS - Glaces et Continents, Climats et Isotopes Stables
4 OSUG - Observatoire des Sciences de l'Univers de Grenoble
5 AARI - Arctic and Antarctic Research Institute
6 EAWAG - Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf]
7 Ion Beam Physics [ETH Zürich]
8 AWI - Alfred Wegener Institute for Polar and Marine Research
9 NBI - Niels Bohr Institute [Copenhagen]

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).

Domaines: Océan, Atmosphère; Interfaces continentales, environnement

Grant M. Raisbeck, Alexandre Cauquoin, Jean Jouzel, Amaëlle Landais, Jean-Robert Petit, et al.. An improved north–south synchronization of ice core records around the 41 kyr $^{10}$Be peak. Climate of the Past, 2017, 13 (3), pp.217-229. ⟨10.5194/cp-13-217-2017⟩. ⟨hal-03108171⟩