Climate of the Past
Climate of the Past
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Articles | Volume 21, issue 6
Articles | Volume 21, issue 6
https://doi.org/10.5194/cp-21-1043-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-1043-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 6
Research article
 | 
13 Jun 2025
Research article |  | 13 Jun 2025

Closing the Plio-Pleistocene 13C cycle in the 405 kyr periodicity by isotopic signatures of geological sources

Peter Köhler

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Short summary
Using a carbon cycle model, I show that the 405 kyr periodicity found in marine δ13C during the last 5 million years and the offset in atmospheric δ13CO2 between the Last Glacial Maximum and the Penultimate Glacial Maximum are probably related to each other. They can be explained by variations in the δ13C signature of weathered carbonate rock or of volcanically degassed CO2, which vary mainly with obliquity (41 kyr), suggesting that Northern Hemispheric land ice sheets are their ultimate drivers.
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