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By comparing the high-resolution isotopic records from the GRIP and NGRIPicecores, we approximately separate the climate signal from local noise toobtain an objective criterion for defining Dansgaard-Oeschger events. Ouranalysis identifies several additional short lasting events, increasing thetotal number of DO events to 27 in the period 12-90 kyr BP. The quasi-regularoccurrence of the DO events could indicate a stochastic or coherent resonancemechanism governing their origin. From the distribution of waiting times weobtain a statistical upper bound on the strength of a possible periodicforcing. This finding indicates that the climate shifts are purely noise drivenwith no underlying periodicity.Comment: 9 figure

The Recurrence Time of Dansgaard–Oeschger Events and Limits on the Possible Periodic Component