The authors wish to thank Gilbert Brunet, Thomas Delworth, John Fyfe, Juno Hsu, Paul Kushner, and Francis Zwiers, as well as Tim Palmer and an anonymous reviewer, for many helpful comments and suggestions. Financial support for this research from the Climate Change Action Fund, the International Arctic Research Centre, the Meteorological Service of Canada/Canadian Institute for Climate Studies, and the National Science and Engineering Research Council is gratefully acknowledged.
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