Paleobotanical Evidence for Near Present-Day Levels of Atmospheric CO 2 During Part of the Tertiary-Reference-Cited by-同舟云学术

Paleobotanical Evidence for Near Present-Day Levels of Atmospheric CO 2 During Part of the Tertiary

Published:2001-06-22 Issue:5525 Volume:292 Page:2310-2313
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Royer Dana L.¹,Wing Scott L.²,Beerling David J.³,Jolley David W.⁴,Koch Paul L.⁵,Hickey Leo J.¹,Berner Robert A.¹

Affiliation:

1. Department of Geology and Geophysics, Yale University, Post Office Box 208109, New Haven, CT 06520–8109, USA.

2. Department of Paleobiology, Smithsonian Institution, Washington, DC 20560, USA.

3. Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK.

4. Centre for Palynology, University of Sheffield, Sheffield S3 7HF, UK.

5. Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA.

Abstract

Understanding the link between the greenhouse gas carbon dioxide (CO 2 ) and Earth's temperature underpins much of paleoclimatology and our predictions of future global warming. Here, we use the inverse relationship between leaf stomatal indices and the partial pressure of CO 2 in modern Ginkgo biloba and Metasequoia glyptostroboides to develop a CO 2 reconstruction based on fossil Ginkgo and Metasequoia cuticles for the middle Paleocene to early Eocene and middle Miocene. Our reconstruction indicates that CO 2 remained between 300 and 450 parts per million by volume for these intervals with the exception of a single high estimate near the Paleocene/Eocene boundary. These results suggest that factors in addition to CO 2 are required to explain these past intervals of global warmth.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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