We would like to thank the editor, Prof. Frederick Sanders, and two anonymous reviewers for their valuable comments. Special thanks go to Lesheng Bai for performing some of the computations and producing some of the figures. This research was sponsored by NASA Grant NAGW-3677, Supplement 3, and by NOAA-Office of Global Programs Grant NA36GP0314-01. It was also supported by Central Weather Bureau, Taipei, Taiwan, China, under Contract CWB84-3M-09. This is Contribution 1072 of the Byrd Polar Research Center.
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