Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch

Pross,Jorg, Contreras, Lineth, Bijl, Peter K., Greenwood, David R., Bohaty, Steven M., Schouten, Stefan, Bendle, James A., Rohl, Ursula, Tauxe, Lisa, Raine, J. Ian, Huck, C Claire E., van de Flierdt, Tina, Jamieson, Stewart S. R., Stickley, Catherine E., van de Schootbrugge, Bas, Escutia, Carlota, Brinkhuis, Henk, Integrated Ocean Drilling Program Expedition 318 Scientists and Welsh, Kevin (2012) Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch. Nature, 488 73-77. doi:10.1038/nature11300

Author Pross,Jorg
Contreras, Lineth
Bijl, Peter K.
Greenwood, David R.
Bohaty, Steven M.
Schouten, Stefan
Bendle, James A.
Rohl, Ursula
Tauxe, Lisa
Raine, J. Ian
Huck, C Claire E.
van de Flierdt, Tina
Jamieson, Stewart S. R.
Stickley, Catherine E.
van de Schootbrugge, Bas
Escutia, Carlota
Brinkhuis, Henk
Integrated Ocean Drilling Program Expedition 318 Scientists
Welsh, Kevin
Title Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch
Journal name Nature   Check publisher's open access policy
ISSN 0028-0836
Publication date 2012-08-02
Sub-type Article (original research)
DOI 10.1038/nature11300
Volume 488
Start page 73
End page 77
Total pages 5
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Abstract The warmest global climates of the past 65 million years occurred during the early Eocene epoch (about 55 to 48 million years ago), when the Equator-to-pole temperature gradients were much smaller than today1, 2 and atmospheric carbon dioxide levels were in excess of one thousand parts per million by volume3, 4. Recently the early Eocene has received considerable interest because it may provide insight into the response of Earth’s climate and biosphere to the high atmospheric carbon dioxide levels that are expected in the near future5 as a consequence of unabated anthropogenic carbon emissions4, 6. Climatic conditions of the early Eocene ‘greenhouse world’, however, are poorly constrained in critical regions, particularly Antarctica. Here we present a well-dated record of early Eocene climate on Antarctica from an ocean sediment core recovered off the Wilkes Land coast of East Antarctica. The information from biotic climate proxies (pollen and spores) and independent organic geochemical climate proxies (indices based on branched tetraether lipids) yields quantitative, seasonal temperature reconstructions for the early Eocene greenhouse world on Antarctica. We show that the climate in lowland settings along the Wilkes Land coast (at a palaeolatitude of about 70° south) supported the growth of highly diverse, near-tropical forests characterized by mesothermal to megathermal floral elements including palms and Bombacoideae. Notably, winters were extremely mild (warmer than 10 °C) and essentially frost-free despite polar darkness, which provides a critical new constraint for the validation of climate models and for understanding the response of high-latitude terrestrial ecosystems to increased carbon dioxide forcing.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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Created: Fri, 05 Apr 2013, 00:22:26 EST by Ashleigh Paroz on behalf of School of Earth Sciences