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The DOI matches its Crossref record; 4 of the 4 references it cites were found in a registry or an index.

Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene

Pagani, Mark, Zachos, James C., Freeman, Katherine H., Tipple, Brett, Bohaty, Stephen·2005·Science

Abstract

The relation between the partial pressure of atmospheric carbon dioxide ( p CO 2 ) and Paleogene climate is poorly resolved. We used stable carbon isotopic values of di-unsaturated alkenones extracted from deep sea cores to reconstruct p CO 2 fromthe middle Eocene to the late Oligocene (∼45 to 25 million years ago). Our results demonstrate that p CO 2 ranged between 1000 to 1500 parts per million by volume in the middle to late Eocene, then decreased in several steps during the Oligocene, and reached modern levels by the latest Oligocene. The fall in p CO 2 likely allowed for a critical expansion of ice sheets on Antarctica and promoted conditions that forced the onset of terrestrial C 4 photosynthesis.

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Crossref · 10.1126/science.1110063

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Metadata

Authors
Pagani, M., Zachos, J. C., Freeman, K. H., Tipple, B., & Bohaty, S.
Venue
Science
Published
2005-07-22
Volume
309
Issue
5734
Pages
600-603
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1999809323
Cited by
902
References
4
FWCI
30.90
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene. https://app.cochat.ai/papers/10.1126/science.1110063
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Pagani, M., Zachos, J. C., Freeman, K. H., Tipple, B., & Bohaty, S. (2005). Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene. Science. https://doi.org/10.1126/science.1110063

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.