We wish to thank Hans von Storch and two other anonymous reviewers for their valuable comments. This work is supported by the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) through Grant GR-523 to YT and by the Canadian Climate Variability Research Network (for HL and JD), funded by CFCAS and the Natural Sciences and Engineering Research Council of Canada. MT is funded by a grant/cooperative agreement from the National Oceanic and Atmospheric Administration (NA05OAR4311004). The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies.
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