Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene
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 mi...
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American Association for the Advancement of Science (AAAS)
2005
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Online Access: | http://dx.doi.org/10.1126/science.1110063 https://www.science.org/doi/pdf/10.1126/science.1110063 |
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craaas:10.1126/science.1110063 2024-10-06T13:43:37+00:00 Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene Pagani, Mark Zachos, James C. Freeman, Katherine H. Tipple, Brett Bohaty, Stephen 2005 http://dx.doi.org/10.1126/science.1110063 https://www.science.org/doi/pdf/10.1126/science.1110063 en eng American Association for the Advancement of Science (AAAS) Science volume 309, issue 5734, page 600-603 ISSN 0036-8075 1095-9203 journal-article 2005 craaas https://doi.org/10.1126/science.1110063 2024-09-12T04:01:01Z 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. Article in Journal/Newspaper Antarc* Antarctica AAAS Resource Center (American Association for the Advancement of Science) Science 309 5734 600 603 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Pagani, Mark Zachos, James C. Freeman, Katherine H. Tipple, Brett Bohaty, Stephen |
spellingShingle |
Pagani, Mark Zachos, James C. Freeman, Katherine H. Tipple, Brett Bohaty, Stephen Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
author_facet |
Pagani, Mark Zachos, James C. Freeman, Katherine H. Tipple, Brett Bohaty, Stephen |
author_sort |
Pagani, Mark |
title |
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
title_short |
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
title_full |
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
title_fullStr |
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
title_full_unstemmed |
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene |
title_sort |
marked decline in atmospheric carbon dioxide concentrations during the paleogene |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1126/science.1110063 https://www.science.org/doi/pdf/10.1126/science.1110063 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Science volume 309, issue 5734, page 600-603 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1110063 |
container_title |
Science |
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309 |
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5734 |
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600 |
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603 |
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1812182138499366912 |