The authors thank two anonymous reviewers for their careful reading, many constructive comments, and suggestions that drastically improved the quality and clarity of this manuscript. They also thank Dr. H.-M. Hsu, Mr. M. Bell, and Mr. S. Ellis for their helpful discussion. This research is partially supported by the National Science Council of Taiwan, Republic of China, under Grant NSC95-2111-M-002-18-Ap2 and NSC95-2625-Z-002-004. The first author expresses his appreciation for the hospitality of Earth Observing Laboratory of the National Center for Atmospheric Research for hosting his sabbatical leave in the summer of 2004 and the spring of 2005.
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