The authors thank N. Harnik, J. Perlwitz, W. Robinson, and T. Shepherd for useful discussions. We also appreciate the comments of three anonymous reviewers, which helped to improve the final draft of this paper. PJK acknowledges the support of the Natural Sciences and Research Council of Canada. LMP is supported, in part, by a grant from the U.S. National Science Foundation. TJR would like to thank GFDL and the Atmospheric and Oceanic Sciences Program at Princeton University for their generous support.
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