My thanks go to members of the climate modeling group of CSIRO Atmospheric Research, and in particular Tony Hirst, who contributed to the development of the coupled GCM and performed the simulation analyzed here. Particularly helpful discussions with Ian Smith and Peter Whetton are gratefully acknowledged. Mark Collier and David Jones provided valuable assistance in the initial stages of the principal component analysis. Valuable comments were received from Ian Simmonds and an anonymous reviewer. This work contributes to the CSIRO Climate Change Research Program and is, in part, funded through Australia’s National Greenhouse Research Program. Information on the IMSL software is available from the National Institute of Standards and Technology internet address /http://math.nist.gov, package IMSLS.
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