We thank ECMWF for providing the ERA-40 reanalysis dataset. This research has been supported by the Natural Sciences and Engineering Research Council of Canada through a Post Doctoral Fellowship to the first author. J.P.’s contribution was funded by the NOAA Climate Program Office. N.H.’s contribution was funded by Grant 1370/08 from the Israeli Science Foundation. The authors are grateful to two anonymous reviewers for their helpful comments.
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