Abstract
In recent years there have been many attempts to use simple energy balance models to simulate the climatic changes that occurred during the Pleistocene by altering the earth’s energy budget through small orbital element changes. Attempts with mean annual models which resolved latitudinal variation in temperature failed to produce large ice sheets when the obliquity was changed a few degrees (1,2) although these early models were generally more sensitive than today’s parameterizations would suggest. Attention then turned to seasonal energy balance models, since the primary insolation anomaly is seasonal. Sellers (3), Thompson and Schneider (4) and North and Coakley (5) developed simple models which were either effectively zonally averaged or included a separate land and ocean surface temperature at each latitude. Suarez and Held (6) added some vertical resolution in their model. All included the ice-albedo feedback mechanism and horizontal transport which was essentially diffusive. The models shared one interesting property : they remained rather insensitive to the sizes of orbital changes which were thought to have occurred in the Pleistocene. There were minor differences in the results and some pointed toward possible ways out of the puzzle but curiously the mechanisms of ice-albedo feedback in the insolation and water vapor feedback in the infrared terms seemed too weak to account for the ice ages (for a review of these models see (7) and more recently (8)).
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References
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North, G.R., Mengel, J.G., Short, D.A. (1984). A Two-Dimensional Climate Model Useful in Ice Age Applications. In: Berger, A., Imbrie, J., Hays, J., Kukla, G., Saltzman, B. (eds) Milankovitch and Climate. NATO ASI Series, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-4841-4_1
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DOI: https://doi.org/10.1007/978-94-017-4841-4_1
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