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1 June 2005 Multicentennial Ring-Width Chronologies of Scots Pine Along a North–South Gradient Across Finland
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Four regional Scots pine ring-width chronologies at the northern forest-limit, and in the northern, middle and southern boreal forest belts in Finland cover the last fourteen centuries. Tree-ring statistics and response functions were examined, and tree-ring width variation was also compared to North Atlantic Oscillation (NAO) and volcanic forcing. The tree-ring statistics show evidence of an ecogeographical gradient along a north–south transect. The three northernmost regional chronologies share a positive response to mid-summer temperature, and all four chronologies show positive and significant correlation to early-summer precipitation. Moreover, a positive and significant relationship to winter NAO was detected in three out of four regional chronologies. NAO also drives the common (inter-regional) growth variability. Years of known cool summers caused by volcanic forcing exhibit exceptionally narrow tree rings in the three northernmost regional chronologies.

Samuli Helama, Markus Lindholm, J. O. U. K. O. Meriläinen, Mauri Timonen, and Matti Eronen "Multicentennial Ring-Width Chronologies of Scots Pine Along a North–South Gradient Across Finland," Tree-Ring Research 61(1), (1 June 2005).
Received: 13 November 2002; Accepted: 1 February 2005; Published: 1 June 2005

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