Climate Model Comparison of Gondwanan and Laurentide Glaciations (original) (raw)

Journal of Geophysical Research, 1991

Abstract

Three different levels of sensitivity experiments were conducted to examine the effect of Gondwanaland landmass on the magnitude of summer warming over ice sheets: (1) simulations with present solar luminosity and present orbital forcing resulted in summer temperatures over the Gondwanan Ice Sheet 12 - 17 C greater than over the Pleistocene Laurentide Ice Sheet; (2) lowering the solar constant 3 percent or modifying the seasonal insolation cycle to a 'cold summer orbit' reduced the warming but still led to significant differences between Gondwanan and Pleistocene simulations; and (3) the combined effect of lowering the solar constant and modifying the seasonal insolation cycle to a cold summer orbit resulted in temperature patterns over the Gondwanan Ice Sheet similar to the Pleistocene. Model simulations also predict tropical sea surface temperatures about 4 C less than at present as a result of reduced solar luminosity.

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