This study was supported by the National Basic Research Program (Grant 2007CB816003) and the National Natural Science Foundation of China (Grants 40976017, 40730843, and 40876004). We also thank Dr. Cai Shuqun, who kindly provided the code for calculating the Rossby wave speed; and Mr. Ling Zheng, who helped prepare the manuscript. Helpful comments from the three anonymous reviewers are greatly appreciated.
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