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The heartbeat of the Oligocene climate system

By H. Pälike, R.D. Norris, J.O. Herrle, P.A. Wilson, H.K. Coxall, C.H. Lear, N.J. Shackleton, A.K. Tripati and B.S. Wade

Abstract

A 13-million-year continuous record of Oligocene climate from the equatorial Pacific reveals a pronounced “heartbeat” in the global carbon cycle and periodicity of glaciations. This heartbeat consists of 405,000-, 127,000-, and 96,000-year eccentricity cycles and 1.2-million-year obliquity cycles in periodically recurring glacial and carbon cycle events. That climate system response to intricate orbital variations suggests a fundamental interaction of the carbon cycle, solar forcing, and glacial events. Box modeling shows that the interaction of the carbon cycle and solar forcing modulates deep ocean acidity as well as the production and burial of global biomass. The pronounced 405,000-year eccentricity cycle is amplified by the long residence time of carbon in the oceans

Topics: QE
Year: 2006
OAI identifier: oai:eprints.soton.ac.uk:42935
Provided by: e-Prints Soton

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Citations

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  10. (2005). The model is a modified version of that originally published by Zachos and Kump
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  12. (1992). The model is a modified version of that originally published by Walker and Kasting
  13. (2005). Figure 2: Topology for Model B The model configuration, including the ice-volume component, and the astronomical forcing, are shown on Figure 2 on the next page.Pälike
  14. 352.08 Constant to calculate infrared flux VARI. (W m^-2 K^-1) irb = irbz-0.0514*log(pco2) used to calculate infrared flux Where: pco2= ../CO2/pco2 VARI. irbz =

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