This work contributes to the CSIRO Climate Change Research Program and is partly funded through Australia’s National Greenhouse Research Program. It constitutes a part of the author’s Ph.D. thesis under the supervision of Dr. Brian Ryan of CSIRO Division of Atmospheric Research and Prof. David Karoly of the Cooperative Research Centre for Southern Hemisphere Meteorology. The author thanks both supervisors for their advice and encouragement and Martin Dix for numerous helpful discussions. Thanks are also due to Dr. Robert Colman of BMRC and an anonymous reviewer for their constructive comments on this paper.
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