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

• Main Authors: Ditlevsen, P. D., Andersen, K. K., Svensson, A.
• Other Authors: Niels Bohr Institute Copenhagen (NBI), Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2007
• Subjects: [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Greenland; Greenland ice cores; NGRIP
• Online Access: https://hal.archives-ouvertes.fr/hal-00298070; https://hal.archives-ouvertes.fr/hal-00298070/document; https://hal.archives-ouvertes.fr/hal-00298070/file/cp-3-129-2007.pdf

International audience 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.