We thank Drs. Zhiwei Wu and Peng Liu for helpful discussions. We also thank the editor and anonymous reviewers for their constructive comments. This work is supported jointly by the National Basic Research Program 973 (Grant 2010CB950401 and 2012CB955204), Special Research Program for Public Welfare (Meteorology) of China (GYHY200906016), the Research and Innovation Project for College Graduates of Jiangsu Province (782002156), and a Project Funded by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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