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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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.