Climate of the Past (Sep 2007)

Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10

  • G. M. Raisbeck,
  • F. Yiou,
  • J. Jouzel,
  • T. F. Stocker

Journal volume & issue
Vol. 3, no. 3
pp. 541 – 547

Abstract

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A new, decadally resolved record of the <sup>10</sup>Be 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 this time period, 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 observed between A1 and A2.