Drake Passage and Cenozoic climate: An open and shut case?

Livermore, R. and Hillenbrand, C. D. and Meredith, M. and Eagles, G. (2007) Drake Passage and Cenozoic climate: An open and shut case? Geochemistry Geophysics Geosystems, 8. Q01005; Artn q01005. ISSN 1525-2027 DOI 10.1029/2005GC001224

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Abstract

Drake Passage opening has often been viewed as a single, discrete event, possibly associated with abrupt changes in global circulation and climate at or near the Eocene-Oligocene boundary. A new plate tectonic model, based on recent reinterpretations of the opening history of basins in the Scotia Sea, suggests that an effective ocean gateway may have developed even earlier, during the middle Eocene. This is consistent with a growing body of evidence from sediment core proxy data for Eocene changes in Southern Ocean circulation and biological productivity. The period between earliest opening after ∼50 Ma and the latest Eocene was characterized by the evolution of various current pathways across the subsiding continental shelves and intervening deep basins. This shallow opening may have caused important changes in Southern Ocean circulation, contributing to Eocene cooling and the growth of Antarctic ice sheets.

Item Type: Article
Uncontrolled Keywords: IA53 2007 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Geochemistry Geophysics Geosystems
Volume: 8
Page Range: Q01005; Artn q01005
Identification Number: 10.1029/2005GC001224
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/481

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