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This is the publisher’s final pdf. The published article is copyrighted by the International Glaciological Society and can be found at: http://www.igsoc.org/journal/.
This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/jgr/.
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work.