Orbital Tuning, Eccentricity, and the Frequency Modulation of Climatic Precession

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Orbital Tuning, Eccentricity, and the Frequency Modulation of Climatic Precession

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dc.contributor.author Huybers, Peter John
dc.contributor.author Aharonson, Oded
dc.date.accessioned 2012-09-26T14:50:46Z
dc.date.issued 2010
dc.identifier.citation Huybers, Peter and Oded Aharonson. 2010. Orbital tuning, eccentricity, and the frequency modulation of climatic precession. Paleoceanography 40:PA4228. en_US
dc.identifier.issn 0883–8305 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:9639972
dc.description.abstract The accuracy of geologic chronologies can, in principle, be improved through orbital tuning, the systematic adjustment of a chronology to bring the associated record into greater alignment with an orbitally derived signal. It would be useful to have a general test for the success of orbital tuning, and one proposal has been that eccentricity ought to covary with the amplitude envelope associated with precession variability recorded in tuned geologic records. A common procedure is to filter a tuned geologic record so as to pass precession period variability and compare the amplitude modulation of the resulting signal against eccentricity. There is a reasonable expectation for such a relationship to be found in paleoclimate records because the amplitude of precession forcing depends upon eccentricity. However, there also exists a relationship between eccentricity and the frequency of precession such that orbital tuning generates eccentricity-like amplitude modulation in filtered signals, regardless of the accuracy of the chronology or the actual presence of precession. This relationship results from the celestial mechanics governing eccentricity and precession and from the interaction between frequency modulation and amplitude modulation caused by filtering. When the eccentricity of Earth's orbit is small, the frequency of climatic precession undergoes large variations and less precession energy is passed through a narrow-band filter. Furthermore, eccentricity-like amplitude modulation is routinely obtained from pure noise records that are orbitally tuned to precession and then filtered. We conclude that the presence of eccentricity-like amplitude modulation in precession-filtered records does not support the accuracy of orbitally tuned time scales. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.isversionof doi:10.1029/2010PA001952 en_US
dash.license OAP
dc.subject orbital tuning en_US
dc.subject precession en_US
dc.subject eccentricity en_US
dc.title Orbital Tuning, Eccentricity, and the Frequency Modulation of Climatic Precession en_US
dc.type Journal Article en_US
dc.description.version Accepted Manuscript en_US
dc.relation.journal Paleoceanography en_US
dash.depositing.author Huybers, Peter John
dc.date.available 2012-09-26T14:50:46Z

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  • FAS Scholarly Articles [7588]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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