Helpful comments were provided by Dr. Charles Macaskill from the School of Mathematics and Statistics, University of Sydney in New South Wales Australia; Dr. Richard Coleman from the Department of Surveying and Spatial Information Science, University of Tasmania in Hobart, Tasmania, Australia; Dr. John Church from the Commonwealth Scientific and Industrial Research Organisation Division of Oceanography in Hobart; Prof. Bill Budd from the Antarctic CRC, University of Tasmania in Hobart; and two anonymous reviewers. The authors are also grateful to Mrs. Judy Davis of the School of Earth Sciences, Macquarie University in North Ryde, New South Wales, Australia, for redrafting some of the computer-generated figures. This project was supported by a National Greenhouse Advisory Committee grant.
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