The ENSEMBLES data used in this work were funded by the EU FP6 Integrated Project ENSEMBLES (Contract 505539) whose support is gratefully acknowledged. We acknowledge the WCRP/CLIVAR Working Group on Seasonal-to-Interannual Prediction (WGSIP) for establishing the Climate-system Historical Forecast Project (CHFP; see Kirtman and Pirani 2009) and the Centro de Investigaciones del Mar y la Atmosfera (CIMA) for providing the model output (http://chfps.cima.fcen.uba.ar/). We also thank the data providers for making the model output available through CHFP. We appreciate the constructive and thoughtful comments and suggestions from two anonymous reviewers that helped improve this manuscript.
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