Minimal Antarctic sea ice during the Pliocene
journal contribution
posted on 2023-05-16, 16:40 authored by Whitehead, JM, Wotherspoon, SJ, Bohaty, SMAntarctic 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.
Funding
Australian Research Council
History
Publication title
GeologyVolume
33Pagination
137-140ISSN
0091-7613Department/School
School of Natural SciencesPublisher
Geological Society of AmericaPlace of publication
Boulder, USARepository Status
- Restricted
Socio-economic Objectives
Climate variability (excl. social impacts)Usage metrics
Categories
Keywords
Licence
Exports
RefWorksRefWorks
BibTeXBibTeX
Ref. managerRef. manager
EndnoteEndnote
DataCiteDataCite
NLMNLM
DCDC