Journal article · Preprint article
The Recurrence Time of Dansgaard–Oeschger Events and Limits on the Possible Periodic Component
The Niels Bohr Institute, Department of Geophysics, University of Copenhagen, Copenhagen, Denmark1
By comparing the high-resolution isotopic records from the GRIP and NGRIP icecores, we approximately separate the climate signal from local noise to obtain an objective criterion for defining Dansgaard-Oeschger events. Our analysis identifies several additional short lasting events, increasing the total number of DO events to 27 in the period 12-90 kyr BP.
The quasi-regular occurrence of the DO events could indicate a stochastic or coherent resonance mechanism governing their origin. From the distribution of waiting times we obtain a statistical upper bound on the strength of a possible periodic forcing. This finding indicates that the climate shifts are purely noise driven with no underlying periodicity.
Language: | English |
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Year: | 2005 |
Pages: | 2594-2603 |
ISSN: | 15200442 and 08948755 |
Types: | Journal article and Preprint article |
DOI: | 10.1175/JCLI3437.1 |
ORCIDs: | Andersen, Katrine K. |