Climate of the Past
Climate of the Past
CP
Articles | Volume 21, issue 11
Articles | Volume 21, issue 11
https://doi.org/10.5194/cp-21-2115-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-21-2115-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 11
Research article
 | 
11 Nov 2025
Research article |  | 11 Nov 2025

Oligocene-early Miocene paradox of pCO2 inferred from alkenone carbon isotopic fractionation and sea surface temperature trends

José Guitián, Samuel Phelps, Reto S. Wijker, Pratigya J. Polissar, Laura Arnold, and Heather M. Stoll

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Short summary
We reconstructed from sediments of different ocean sites phytoplankton carbon isotopic fractionation (εp), mainly linked to CO2 variations, during the Oligocene to early Miocene. Data confirm Cenozoic long-term CO2 record but show contrasting relationships with the sea surface temperatures evolution. We evaluate the role of non-CO2 environmental factors such as temperature and nutrients at each site εp, highlighting the complexity of interpreting climate dynamics and CO2 reconstructions.
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