This is a publication under the project Arctic Climate System Study (ACSYS) of the World Climate Research Programme. The Norwegian Polar Institute and the International Arctic Research Center, University of Alaska, Fairbanks, have sponsored the work. T. B. Løyning at the ACSYS ULS-data repository has evaluated the ice thickness monitoring series given online at http://npolar.no/ADACIT/. Thanks are also extended to two reviewers for supportive comments and suggestions.
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