We thank three anonymous reviewers for helpful comments and suggestions and Dr. Jiangyu Mao and Dr. Zhiwei Wu for useful advice and comments. In particular, the predictability calculation for filtered random background noise suggested by one reviewer greatly improved the interpretation of the results. Funding for this research was provided jointly by NSFC Projects (40805022 and 40675046) and the 973 program (2006CB403600). Author Seo was funded by the Korea Meteorological Administration Research and Development Program under Grant CATER 2007-4208.
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