Brøgger Seminar Series
The Last Interglacial in Antarctic Ice Cores 

When? 20 October, 15h00–16h00
Where? Nordenskiöldsalen, Geovetenskapens hus

 

Abstract:
During the last interglacial (LIG; 130 000–115 000 years ago) global climate was warmer than today. In particular, measurements of water isotopes in Antarctic ice cores suggest temperatures were considerably higher than present day. This is despite atmospheric CO2 levels which were only slightly higher than those in the preindustrial Holocene interglacial. In this seminar we explore a variety of hypothesized causes of these ice core data, including the loss of the West Antarctic ice sheet, the reduction in Southern Ocean sea ice, and polar amplification of temperature changes in the Southern Hemisphere.

 
Louise Sime, Guest Seminar at the Department of Geological Sciences, Stockholm University

Louise Sime is the group leader of Paleoclimate Research at the British Antarctic Survey. Her research is primarily concerned with the use of novel techniques to better understand changes in the ice sheets, sea ice, and climate in polar regions over the last 800 000 years. Much of her effort goes into understanding ice core observations by using water isotopes in climate models. Stable water isotopes (deuterium and oxygen-18) in ice record represent a key long-term proxy record of climate. Using the water isotope enabled simulations help to better understand how ice sheets, sea ice, and climate behaved in the past.
More information at https://www.bas.ac.uk/profile/lsim

 

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