Multicentennial Ring-Width Chronologies of Scots Pine Along a North-South Gradient Across Finland
AffiliationDepartment of Geology, University of Helsinki, Finland
Saima Centre for Environmental Sciences, University of Joensuu, Savolinna, Finland
Finnish Forest Research Institute, Rovaniemi Research Station, Rovaniemi, Finland
North Atlantic Oscillation
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CitationHelama, S., Lindholm, M., Meriläinen, J., Timonen, M., Eronen, M. 2005. Multicentennial ring-width chronologies of Scots pine along a north-south gradient across Finland. Tree-Ring Research 61(1):21-32.
AbstractFour 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.