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Several hypotheses have been put forth to explain the 80 –100 ppm change in atmospheric carbon dioxide concentrations that has occurred consistently on glacial-interglacial timescales over the past 800,000 years (Sigman et al. 2010). A combination of process-based modelling and paleo-environmental data from the geological record suggest that while changes in ocean biology have likely played a role as an important feedback mechanism, changes in marine biology alone cannot explain the full glacial-interglacial change in atmospheric carbon dioxide concentrations (Kohfeld et al. 2005, Kohfeld and Ridgwell 2009). This result points towards an important, triggering role of physical changes in the global ocean as a main driver of changes in atmospheric carbon dioxide concentrations, in particular during the earliest part of the glacial cycle.

Item Type:	Non Refereed Conference Paper
Keywords:	glacial inception, paleoceanography
Research Division:	Earth Sciences
Research Group:	Physical geography and environmental geoscience
Research Field:	Palaeoclimatology
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the earth sciences
UTAS Author:	Chase, Z (Professor Zanna Chase)
ID Code:	101373
Year Published:	2015
Funding Support:	Australian Research Council (FT120100759)
Deposited By:	IMAS Research and Education Centre
Deposited On:	2015-06-21
Last Modified:	2015-06-22
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