Multicentennial Ring-Width Chronologies of Scots Pine Along a North–South Gradient Across Finland

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.

Boreal · Climate change · Climatology · Dendrochronology · Dendroclimatology · Forcing (mathematics) · Geography · North Atlantic oscillation · Physical geography · Pinus · Plateau (mathematics) · Precipitation · Scots pine · Taiga · Transect · Tree line · Volcano · Climate variability and models · Forestry · Geology · Oceanography · Paleontology · Plant Water Relations and Carbon Dynamics · Tree-ring climate responses

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