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Holocene temperature records show millennial-scale periodicity

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Past studies have detected an ~1500-year climate cycle in various types of Pleistocene geologic or ice deposits. It has been proposed that a 1470-year cycle fits the Pleistocene Dansgaard–Oeschger (DO) oscillations and can be explained by a threshold model with forcing. We used nine temperature reconstructions to see if this cycle exists during the Holocene. All these data sets, except Greenland Holocene data, can be fit by models close to a 1470-year period or are compatible to such a model, or can be fit by cycles near 1200years, both of which can be related to solar forcing. These results lend support to the nonlinear threshold model for initiation of Pleistocene DO events and suggest that this periodic climate signal has continued into the Holocene, but with reduced magnitude.

Des études antérieures ont détecté un cycle climatique d’environ 1500 ans dans divers types de dépôts géologiques ou glaciaires du Pléistocène. Il a été proposé qu’un cycle de 1470 ans concorde avec les oscillations Dansgaard–Oeschger (DO) du Pléistocène et il peut être expliqué par un modèle de seuil avec forçage. Nous avons utilisé neuf reconstructions de températures pour voir si ce cycle existait durant l’Holocène. Tous ces ensembles de données, sauf les données provenant de l’Holocène au Groenland, peuvent être corrélés à des modèles ayant un cycle d’une période approximative de 1470 ans, ou ils sont compatibles avec un tel modèle, ou encore ils peuvent correspondre à des cycles d’approximativement 1200 ans, les deux pouvant être reliés à un forçage solaire. Ces résultats supportent le modèle non linéaire de seuil pour l’initiation des événements DO au Pléistocène et ils suggèrent que ce signal de climat périodique ait continué dans l’Holocène, mais avec une magnitude moindre.

Document Type: Research Article

Publication date: October 1, 2010

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