This research was jointly funded by the National Natural Sciences Fundation of China (Grant 41105037) and by the Natural Science and Engineering Research Council of Canada (NSERC). Jia was also supported by the Fundamental Research Funds for the Central Universities (Grant 2012XZZX012) and the R&D Special Fund for Public Welfare Industry (meteorology) (Grant GYHY201106035). We are grateful to Prof. Jacques Derome for his helpful suggestions for improving our paper.
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