Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene-Reference-Cited by-同舟云学术

Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene

Published:2005-07-22 Issue:5734 Volume:309 Page:600-603
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Pagani Mark¹²³,Zachos James C.¹²³,Freeman Katherine H.¹²³,Tipple Brett¹²³,Bohaty Stephen¹²³

Affiliation:

1. Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, CT 06511, USA.

2. Earth Sciences Department, University of California, 1156 High Street, Santa Cruz, CA 95064, USA.

3. Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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