The authors appreciate the several constructive discussions with Dr. Dong Xiao of the China Meteorological Administration (CMA). Comments from three anonymous reviewers have improved the overall quality of this paper. This study was jointly supported by the National Natural Science Foundation of China under Grant 40921003, the International S&T Cooperation Project of the Ministry of Science and Technology of China under Grant 2009DFA21430, the Basic Research Fund of the Chinese Academy of Meteorological Sciences under Grant 2010Z001, and the NOAA-CMA bilateral program.
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