This study was funded by the Korea Meteorological Administration Research and Development Program under Grant CATER 2006–4204. JHK and HSK were also supported by the Brain Korea 21 (BK21) Project in 2007. CHS was supported by the National Sciences Council in Taiwan under Grants NSC 093-2111-M-008-002 and NSC 094-2111-M-008-008. Part of this work was carried out by JHK in Taiwan during the period of 1 March 2005–31 March 2006 and was supported by the same NSC grants. The authors are grateful to three anonymous reviewers. Their helpful comments and suggestions led this study to a publishable work.
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