The authors thank Dr. Bin Wang and anonymous reviewers for constructive suggestions and comments that led to great improvement of this manuscript. Comments given by Drs. Shang-Ping Xie and Fei-Fei Jin are also greatly appreciated. This work is a part of XJ’s Ph.D. dissertation supported partially by the International Pacific Research Center (IPRC). TL acknowledges the support of NSF Grant ATM-0329531. The IPRC is sponsored in part by the Frontier Research System for Global Change.
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