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

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...

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Bibliographic Details
Main Authors: P. D. Ditlevsen, K. K. Andersen, A. Svensson
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2007
Subjects:
Environmental pollution
TD172-193.5
Environmental protection
TD169-171.8
Environmental sciences
GE1-350
Greenland
Greenland ice cores
NGRIP
Online Access:https://doaj.org/article/2169126c7236477cb0f4c8c1d2e05962
Description
Summary: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.

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