This work was jointly supported by the MOST of China (Grant 2011CB403505), Chinese Academy of Sciences through the Project KZCX2-EW-208, the National Natural Science Foundation of China (Grant 41076009), and the Hundred Talent Program of the Chinese Academy of Sciences. Thanks to Rick Lumpkin from NOAA for providing his code of GM decomposition. Constructive comments and suggestions from the two anonymous reviewers are also gratefully acknowledged.
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