The DO-climate events are probably noise induced: statistical investigation of the claimed 1470 years cycle

P. D. Ditlevsen (1) , K. K. Andersen (1) , A. Svensson (1)

1 NBI - Niels Bohr Institute [Copenhagen]

The significance of the apparent 1470 years cycle in the recurrence of the Dansgaard-Oeschger (DO) events, observed in the Greenland ice cores, is debated. Here we present statistical significance tests of this periodicity. The detection of a periodicity relies strongly on the accuracy of the dating of the DO events. Here we use both the new NGRIP GICC05 time scale based on multi-parameter annual layer counting and the GISP2 time scale where the periodicity is most pronounced. For the NGRIP dating the recurrence times are indistinguishable from a random occurrence. This is also the case for the GISP2 dating, except in the case where the DO9 event is omitted from the record.

Domaines: Interfaces continentales, environnement; Sciences de la Terre

P. D. Ditlevsen, K. K. Andersen, A. Svensson. The DO-climate events are probably noise induced: statistical investigation of the claimed 1470 years cycle. Climate of the Past, 2007, 3 (1), pp.129-134. ⟨hal-00298070⟩