The authors thank the anonymous reviewers for their constructive comments. The work is supported by the State Key Development Program for Basic Research of China (Grants 2009CB421506 and 2011CB403405), the key program of CAMS (Grant 2012Z001), the National Natural Science Foundation of China (Grants 41221064, 41075056, 41205116, and 41075015), and the Program of China Meteorological Administration (Grant GYHY200906002).
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