No extreme bipolar glaciation during the main Eocene calcite compensation shift

Kirsty M. Edgar, Paul A. Wilson (), Philip F. Sexton and Yusuke Suganuma
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Kirsty M. Edgar: National Oceanography Centre, School of Ocean and Earth Science, European Way, Southampton, SO14 3ZH, UK
Paul A. Wilson: National Oceanography Centre, School of Ocean and Earth Science, European Way, Southampton, SO14 3ZH, UK
Philip F. Sexton: National Oceanography Centre, School of Ocean and Earth Science, European Way, Southampton, SO14 3ZH, UK
Yusuke Suganuma: University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033 Japan

Nature, 2007, vol. 448, issue 7156, 908-911

Abstract: No need for an icy north Until recently, it was thought that Northern Hemisphere glaciation began between 11 and 5 million years ago, but this view has been challenged by contradictory evidence including estimates of global ice volumes in excess of the storage capacity of Antarctica 41.6 million years ago. Edgar et al. test the hypothesis that large ice sheets were present in both hemispheres at that time using marine sediment records from the equatorial Atlantic Ocean. Their estimates of ice volume can easily be accommodated on Antarctica, indicating that large ice sheets were not present in the Northern Hemisphere. The findings support climate model simulations suggesting that a threshold for continental glaciation was crossed earlier in the Southern Hemisphere than in the Northern Hemisphere due to the different land–ocean distributions at the two poles.

Date: 2007
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DOI: 10.1038/nature06053

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