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Postgraduate Students


Emily Deaney

Presidents Research Scholarship: ‘ABRUPT CLIMATE CHANGE AND GLACIAL TERMINATIONS’


Ice core records from Greenland and Antarctica tell us that millennial-scale climate change during the last glacial and deglacial periods involved the interplay between high northern and southern latitudes, probably involving changes in the Atlantic Meridional overturning circulation.  My project investigates the sub-millennial scale changes in surface and deep waters within the Southern Ocean/South Atlantic region during early glacial and deglacial periods of the Pleistocene.  This work will test the hypothesis that changes in this region were equally as abrupt as those in the North Atlantic, and could have contributed toward global warming during deglaciation through their influence on atmospheric carbon dioxide (CO2).

 

This study will involve the application of multiple paleoceanographic methods to a high sedimentation rate marine sediment core – ODP Site 1089.  These techniques will include foraminiferal faunal counts, diatom assemblage reconstruction, stable isotope measurements and geochemical techniques (such as trace elements in foraminiferal calcite and neodymium isotopes).  This multi-proxy approach of both surface and deep water conditions, in the Southern Ocean/South Atlantic region, will provide a powerful approach for reconstructing the important processes at work across the glacial and deglacial periods of the Pleistocene.