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Combined obliquity and precession pacing of late Pleistocene deglaciations

Nature volume 480, pages 229–232 (2011)Cite this article

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Abstract

Milankovitch1 proposed that Earth resides in an interglacial state when its spin axis both tilts to a high obliquity and precesses to align the Northern Hemisphere summer with Earth’s nearest approach to the Sun. This general concept has been elaborated into hypotheses that precession2, obliquity3,4 or combinations of both5,6,7,8 could pace deglaciations during the late Pleistocene9,10. Earlier tests have shown that obliquity paces the late Pleistocene glacial cycles4,11 but have been inconclusive with regard to precession, whose shorter period of about 20,000 years makes phasing more sensitive to timing errors4,11,12. No quantitative test has provided firm evidence for a dual effect. Here I show that both obliquity and precession pace late Pleistocene glacial cycles. Deficiencies in time control that have long stymied efforts to establish orbital effects on deglaciation are overcome using a new statistical test that focuses on maxima in orbital forcing. The results are fully consistent with Milankovitch’s proposal but also admit the possibility that long Southern Hemisphere summers contribute to deglaciation.

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Figure 1: Test of the Milankovitch hypothesis.
Figure 2: Sensitivity of the test to choice of orbital forcing.
Figure 3: Orbital forcing of glacial cycles.

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Acknowledgements

This work benefited from comments by G. Gebbie, L. Lisiecki, A. Stine and C. Wunsch.

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  1. phuybers@fas.harvard.edu

Authors and Affiliations

  1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, 02138, Massachusetts, USA

    Peter Huybers

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  1. Peter Huybers
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Supplementary information

Supplementary Information

This zipped file contains the individual Matlab files that were used to generate the statistical and modeling results presented in the main paper. Also included is a supporting file (run_first.m) that contains the search path and three supporting directories that contain a total of 22 other files. Each m-file contains header information that explains its functionality in more detail. (ZIP 20125 kb)

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Huybers, P. Combined obliquity and precession pacing of late Pleistocene deglaciations. Nature 480, 229–232 (2011). https://doi.org/10.1038/nature10626

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