Articles | Volume 17, issue 2
https://doi.org/10.5194/cp-17-703-2021
https://doi.org/10.5194/cp-17-703-2021
Research article
 | 
26 Mar 2021
Research article |  | 26 Mar 2021

Atmospheric carbon dioxide variations across the middle Miocene climate transition

Markus Raitzsch, Jelle Bijma, Torsten Bickert, Michael Schulz, Ann Holbourn, and Michal Kučera

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Latest update: 20 Apr 2024
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Short summary
At approximately 14 Ma, the East Antarctic Ice Sheet expanded to almost its current extent, but the role of CO2 in this major climate transition is not entirely known. We show that atmospheric CO2 might have varied on 400 kyr cycles linked to the eccentricity of the Earth’s orbit. The resulting change in weathering and ocean carbon cycle affected atmospheric CO2 in a way that CO2 rose after Antarctica glaciated, helping to stabilize the climate system on its way to the “ice-house” world.