[Bolincentret-at-su.se] Late glacial palaeoclimate seminar: Tomorrow, Tuesday 19 Sept

[Helen Coxall]

"Moving beyond the age-depth paradigm in deep sea palaeoclimate archives 
using single foram ^14 C dating".


Bryan Lougheed, Uppsala University

IGV, William-Olssonsalen, Tuesday, September 19, 12.15-13.00

Abstract:

Late-glacial paleoclimate reconstructions from deep-sea sediment 
archives provide valuable insight into past rapid changes in ocean 
chemistry, but only a small proportion of the ocean floor is suitable 
for such reconstructions using the existing state-of-the-art. We employ 
ultra-small radiocarbon (^14 C) dating on single microscopic 
foraminifera to demonstrate that the longstanding age-depth method 
conceals large age uncertainty caused by post-depositional sediment 
mixing. To overcome these problems, we use dual ^14 C and stable isotope 
(δ^18 O and δ^13 C) analysis on single microscopic foraminifera to 
produce a paleoclimate time series independent of the age-depth 
paradigm. This new method will address large geographical gaps in 
late-glacial benthic paleoceanographic reconstructions by opening up 
vast areas of previously disregarded deep-sea archives, leading to 
improved understanding of the interaction between oceans and climate.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.su.se/pipermail/bolincentret-at-su.se/attachments/20170918/1fa58048/attachment.html>