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Climate of the Past An interactive open-access journal of the European Geosciences Union
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In the Eocene (~ 55 million years ago), the Earth had high levels of atmospheric CO2, so studies of the Eocene can provide insights into the likely effects of present-day fossil fuel burning. We ran a low-resolution but very fast climate model with 50 combinations of CO2 and orbital parameters, and an Eocene layout of the oceans and continents. Climatic effects of CO2 are dominant but precession and obliquity strongly influence monsoon rainfall and ocean–land temperature contrasts, respectively.
CP | Articles | Volume 14, issue 2
Clim. Past, 14, 215–238, 2018
https://doi.org/10.5194/cp-14-215-2018
Clim. Past, 14, 215–238, 2018
https://doi.org/10.5194/cp-14-215-2018

Research article 23 Feb 2018

Research article | 23 Feb 2018

Sensitivity of the Eocene climate to CO2 and orbital variability

John S. Keery et al.

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Cited articles

Abbot, D. S. and Tziperman, E.: A high-latitude convective cloud feedback and equable climates, Q. J. Roy. Meteor. Soc., 134, 165–185, https://doi.org/10.1002/qj.211, 2008. 
Akaike, H.: A new look at the statistical model identification, IEEE T. Automat. Contr., 19, 716–723, 1974. 
Akhmetiev, M. A., Zaporozhets, N. I., Benyamovskiy, V. N., Aleksandrova, G. N., Iakovleva, A. I., and Oreshkina, T. V.: The Paleogene history of the Western Siberian seaway – A connection of the Peri-Tethys to the Arctic Ocean, Austrian J. Earth Sci., 105, 50–67, 2012. 
Anagnostou, E., John, E. H., Edgar, K. M., Foster, G. L., Ridgwell, A., Inglis, G. N., Pancost, R. D., Lunt, D. J., and Pearson, P. N.: Changing atmospheric CO2 concentration was the primary driver of early Cenozoic climate, Nature, 533, 380–384, https://doi.org/10.1038/nature17423, 2016. 
Araya-Melo, P. A., Crucifix, M., and Bounceur, N.: Global sensitivity analysis of the Indian monsoon during the Pleistocene, Clim. Past, 11, 45–61, https://doi.org/10.5194/cp-11-45-2015, 2015. 
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Short summary
In the Eocene (~ 55 million years ago), the Earth had high levels of atmospheric CO2, so studies of the Eocene can provide insights into the likely effects of present-day fossil fuel burning. We ran a low-resolution but very fast climate model with 50 combinations of CO2 and orbital parameters, and an Eocene layout of the oceans and continents. Climatic effects of CO2 are dominant but precession and obliquity strongly influence monsoon rainfall and ocean–land temperature contrasts, respectively.
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