Milankovitch fluctuations on supercontinents

Details Milankovitch fluctuations on supercontinents Milankovitch fluctuations on supercontinents

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..793c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 793-796.

Physics

5

Annual Variations, Continents, Mesozoic Era, Paleoclimatology, Atmospheric General Circulation Models, Climate Change, Summer, Two Dimensional Models

Scientific paper

A two-dimensional energy balance climate model is used to examine the potential effects of Milankovitch fluctuations for a supercontinent configuration. It is calculated that Milankovitch variations can modulate the magnitude of summer warming by as much as 14-16 deg on Pangaea, with large changes occurring in both the Northern and Southern Hemispheres. However, lower topography in the Jurassic may have reduced the magnitude of precipitation variations associated with these changes. Altered geography and CO2 levels may have caused summer temperatures of 25 C in high latitudes during peak precession half cycles of hot summer orbits. This result suggests that evidence for high-latitude warmth needs to consider the potential influence of Milankovitch forcing.

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