We thank Dr. Y. Fan at the NOAA’s Climate Prediction Center for providing the monthly data of surface air temperature over land and soil moisture content. We also thank the European Centre for Medium-Range Weather Forecasts, NOAA’s Climate Diagnostic Center, and the Hadley Centre, Met Office for providing the reanalysis datasets available on the Internet. Finally, we are grateful to the editor, A. J. Pitman, and the anonymous reviewers for their helpful and careful reviews that greatly improved the manuscript. This work was jointly sponsored by the National Natural Science Foundation of China (40625014; 40890053) and the National Key Basic Research Project of China (2009CB421404).
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