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Principle components analysis (PCA) showing differences in selected environmental variables by region. Alaska sites are shown in red squares, the Greenland Ice Sheet (GrIS) in gold circles, Iceland in green triangles, Norway in turquoise diamonds, Qeqertarsuaq in blue upside-down triangles, and Svalbard in purple asterisks. Sites with missing environmental data are excluded (i.e., Foxfonna and Midtre Lovénbreen, see Tables 1, 2). Ellipse probabilities are set to 0.8.
