Earth System Dynamics
Earth System Dynamics
ESD
Articles | Volume 14, issue 2
Articles | Volume 14, issue 2
https://doi.org/10.5194/esd-14-291-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-14-291-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 14, issue 2
Research article
 | 
21 Mar 2023
Research article |  | 21 Mar 2023

Multi-million-year cycles in modelled δ13C as a response to astronomical forcing of organic matter fluxes

Gaëlle Leloup and Didier Paillard

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Latest update: 29 Oct 2025
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Short summary
Records of past carbon isotopes exhibit oscillations. It is clear over very different time periods that oscillations of 400 kyr take place. Also, strong oscillations of approximately 8–9 Myr are seen over different time periods. While earlier modelling studies have been able to produce 400 kyr oscillations, none of them produced 8–9 Myr cycles. Here, we propose a simple model for the carbon cycle that is able to produce 8–9 Myr oscillations in the modelled carbon isotopes.
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