HR: 1340h
AN: PP33C-1602    [Abstracts]
TI: The recurrence time of Dansgaard-Oeschger events and limits on the possible periodic component
AU: Kristensen, M S
EM: msk@gfy.ku.dk
AF: Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen O, 2100 Denmark
AU: * Ditlevsen, P D
EM: pditlev@gfy.ku.dk
AF: Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen O, 2100 Denmark
AU: Andersen, K K
EM: kka@gfy.ku.dk
AF: Niels Bohr Institute, Juliane Maries Vej 30, Copenhagen O, 2100 Denmark
AB: 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.
DE: 0724 Ice cores (4932)
DE: 1605 Abrupt/rapid climate change (4901, 8408)
DE: 1620 Climate dynamics (0429, 3309)
DE: 4901 Abrupt/rapid climate change (1605)
DE: 4932 Ice cores (0724)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005