Tree Ring Indices: A Circumpolar Comparison

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Science  10 Nov 1967:
Vol. 158, Issue 3802, pp. 773-775
DOI: 10.1126/science.158.3802.773


A graphic and statistical comparison of major trends in tree ring indices representative of interior Alaska, northern Urals, northern Scandinavia, and Labrador indicates a highly significant correlation for most 50-year intervals between 1650 and the present. This is suggestive of similarities in trends of summer temperature on a circumpolar scale.