Global vegetation dynamics and latitudinal temperature gradients during the Mid to Late Miocene (15.97–5.33Ma)

Pound, Matthew J.; Haywood, Alan M.; Salzmann, Ulrich; Riding, James B

doi:10.1016/j.earscirev.2012.02.005

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Global vegetation dynamics and latitudinal temperature gradients during the Mid to Late Miocene (15.97–5.33Ma)

Author(s): Matthew J. Pound , Alan M. Haywood , Ulrich Salzmann , James B. Riding

Publication date Created: April 2012

Publication date (Print): April 2012

Journal: Earth-Science Reviews

Publisher: Elsevier BV

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Marked decline in atmospheric carbon dioxide concentrations during the Paleogene.

M. Pagani (2005)

The relation between the partial pressure of atmospheric carbon dioxide (pCO2) and Paleogene climate is poorly resolved. We used stable carbon isotopic values of di-unsaturated alkenones extracted from deep sea cores to reconstruct pCO2 from the middle Eocene to the late Oligocene (approximately 45 to 25 million years ago). Our results demonstrate that pCO2 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 pCO2 likely allowed for a critical expansion of ice sheets on Antarctica and promoted conditions that forced the onset of terrestrial C4 photosynthesis.