An improved north-south synchronization of ice core records around the 41 kyr 10Be peak

Using new high-resolution Be-10 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 similar to 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 (Delta depth), difference between age of ice and enclosed gas at the same depth (Delta age) in the EDC and EDML ice cores, spectral properties of the Be-10 profiles and phasing between Dansgaard-Oeschger-10 (in NGRIP) and AIM-10 (in EDML and EDC).