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The density measurements correlate closely with the summer temperatures in this area on the edge of the Nordic taiga; the researchers were thus able to create a temperature reconstruction of unprecedented quality.
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Rings happen because of the change in growth speed through winter, spring, summer and fall, so one ring usually marks the passage of one year in the life of the tree.
"Age" in these first two types will invariably be a minimum age rather than true chronological age owing to the difficulty of sampling a tree exactly at the point of germination.
Extrapolations are ages derived by regression from age/size relationships (e.g.
The tree was cored by Edmund Schulman in the late 1950s but he never had a chance to date it before he died in 1958.
Tom worked up the cores Schulman collected sometime around 2010, and discovered the tree's age at that time.The living stem itself is only a few hundred years old, but there is a radiocarbon age of 9,500 years from dead wood present at its base. Mackenthun instead argues that there is no evidence of genetic continuity between the dead and living wood portions of the tree, nor is there any evidence of clonal origination of Norway spruce in general.
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