Holocene Temperature Records show Millennial Scale Peroidicity

By | March 22, 2012





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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 use nine temperature reconstructions to see if this cycle exists during the Holocene. All these datasets, 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 1200 years, both of which can be related to solar-forcing. These results lend suppor to the non-linear threshold model for initiation of Pleistocene DO events and suggest that this periodic climate cycle has continued into the Holocene, but with reduced magnitude.

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