This research was funded by the Ouranos Consortium, the Global Environmental and Climate Change Centre, the Chinese Universities Scientific Fund, and the Chinese Academy of Meteorological Sciences under Grant 2008LASW-A03. Hai Lin is partly supported by the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) and by the Natural Science and Engineering Research Council of Canada (NSERC). We are grateful to the two anonymous reviewers for their helpful suggestions on improving our paper.
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