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Milankovitch_Variations.png (479 × 363 pixels, file size: 32 KB, MIME type: image/png)

Summary

Description
English: This figure shows the variations in Earth's orbit, the resulting changes in solar energy flux at high latitude, and the observed glacial cycles.

According to Milankovitch Theory, the precession of the equinoxes and the apsides, variations in the tilt of the Earth's axis (obliquity) and changes in the eccentricity of the Earth's orbit are responsible for causing the observed 100 kyr cycle in ice ages by varying the amount of sunlight received by the Earth at different times and locations, particularly high northern latitude summer. These changes in the Earth's orbit are the predictable consequence of interactions between the Earth, its moon, and the other planets.

The orbital data shown are from Quinn et al. (1991). Principal frequencies for each of the three kinds of variations are labeled. The solar forcing curve (aka "insolation") is derived from July 1st sunlight at 65 °N latitude according to Jonathan Levine's insolation calculator [1]. The glacial data are from Lisiecki and Raymo (2005) and gray bars indicate interglacial periods, defined here as deviations in the 5 kyr average of at least 0.8 standard deviations above the mean.
Date 11 February 2006 (upload date)
Source Own work
Author This image was produced by Robert A. Rohde from publicly available data, and is incorporated into the Global Warming Art project.
Other versions Derivative works of this file:  Variacions de Milankovitch.png

References

  • Lisiecki, L. E., and M. E. Raymo (2005), "A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records." Paleoceanography 20, PA1003, doi:10.1029/2004PA001071 (alternative full text link: [2]).
  • Quinn, T. R., S. Tremaine, and M. Duncan (1991), "A Three Million Year Integration of the Earth's Orbit." The Astronomical Journal 101, pp. 2287-2305, doi:10.1086/115850.


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Date/TimeThumbnailDimensionsUserComment
current11:35, 11 February 2006Thumbnail for version as of 11:35, 11 February 2006479 × 363 (32 KB)David Legrand== Description == This figure shows the variations in Earth's orbit, the resulting changes in solar energy flux at high latitude, and the observed glacial cycles. According to Milankovitch Theory, the precession of the [[

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