We thank the anonymous reviewers for helpful comments and constructive suggestions. The first author is grateful to Prof. Mark A. Johnson and Roger L. Colony for constructive discussions. Jia Wang thanks the Coastal Marine Institute, University of Alaska Fairbanks for financial support (MMS/CMI). This study was also supported by the National Nature Foundation of China (Grants 40475030 and 40225012). Wang and Walsh appreciate Frontier Research System for Global Change and CAMP of IARC/NSF for financial support. J. Wang appreciated Prof. M. Wallace for his constructive comments on this study.
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