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Minimal Antarctic sea ice during the Pliocene


Whitehead, JM and Wotherspoon, SJ and Bohaty, SM, Minimal Antarctic sea ice during the Pliocene, Geology, 33, (2) pp. 137-140. ISSN 0091-7613 (2005) [Refereed Article]

DOI: doi:10.1130/G21013.1


Antarctic sea-ice concentration at Ocean Drilling Program Sites 1165 (64.380°S, 67.219°E) and 1166 (67.696°S, 74.787°E) was lower than today through much of the Pliocene. The low sea-ice concentration is evident from the proportion of the diatom Eucampia antarctica with intercalary valves (Eucampia index). This sea-ice proxy was calibrated by using modern diatom data obtained from core-top samples and winter sea-ice concentration data (September average through 1979-1987). The modern relationship is expressed as a binomial generalized linear model (modern sea-ice model). This model was applied to the Pliocene Eucampia index within a 95% tolerance interval (obtained from bootstrap estimates). The results indicate that reduced winter sea-ice concentrations persisted through much of the Pliocene and at times were 78% and 61% relatively less concentrated than today at Sites 1165 and 1166, respectively. © 2005 Geological Society of America.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Whitehead, JM (Dr Jason Whitehead)
UTAS Author:Wotherspoon, SJ (Dr Simon Wotherspoon)
ID Code:34526
Year Published:2005
Funding Support:Australian Research Council (DP0345161)
Web of Science® Times Cited:49
Deposited By:Mathematics and Physics
Deposited On:2005-08-01
Last Modified:2009-06-29

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