We thank C. Reuten, A. Jarosch, F. Anslow, B. Ainslie, D. Moore, F. Weber, and S. Fleming for their constructive discussions and valuable criticism. G. Flato generously provided the NARR data. Furthermore, we thank A. Rasmussen, A. Werner, and the three anonymous reviewers for their valuable comments. Financial support for this project was provided through the Polar Climate Stability Network and the Western Canadian Cryospheric Network, both funded by the Canadian Foundation for Climate and Atmospheric Sciences, and by the Natural Sciences and Engineering Research Council of Canada.
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