The authors would like to express their sincere thanks to Dr. Blair Trewin and another reviewer for the very helpful suggestions and comments to improve the manuscript greatly. Special thanks go to Prof. C. P. Chang, Prof. Liguang Wu, Prof. Deliang Chen, Prof. N.-C. Lau, Prof. Francis W. Zwiers, Prof. Manola Brunet, Dr. Tsz-cheung Lee, Prof. Jinhai He, Dr. Dushmanta Pattanaik, and Dr. Changzheng Liu for their great support and encouragements to this study. This work was supported by the National Natural Science Foundation of China (Grant 41175075) and the Chinese Ministry of Science and Technology Project (Grants N2010CB950501 and 2007BAC29B04).
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