We thank two anonymous reviewers for extremely helpful suggestions and Erik K. Schieffer and Gabriel J. Wolken for assistance with the DEMs and ice masks. Financial support was provided by the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) and the Natural Sciences and Engineering Research Council of Canada. EB acknowledges postdoctural support from the Marie Curie Outgoing International Fellowship program of the European Union. This paper is a contribution to the Polar Climate Stability Network and to the Western Canadian Cryospheric Network, both of which are funded by CFCAS and consortia of Canadian universities.
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