The IPCC AR4 data is obtained from the WCRP CMIP3 multimodel database. We thank the Program for Climate Model Diagnosis and Intercomparison (PCMDI) for collecting and archiving the CMIP3 model output and the WCRP Working Group on Coupled Modeling (WGCM) for organizing the model data analysis activity. GPCP 1DD data are obtained from http://www1.ncdc.noaa.gov/pub/data/gpcp/. The authors thank Hervé Douville for his comments on a previous version of the article. PKX and FJDR are supported by the European ENSEMBLES project.
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