AN 854-YEAR TREE-RING CHRONOLOGY OF SCOTS PINE FOR SOUTH-WEST FINLAND
Journal Title: Studia Quaternaria - Year 2014, Vol 31, Issue 1
Abstract
A near-millennial tree-ring chronology (AD1147-2000) is presented for south-west Finland and analyzed using dendroclimatic methods. This is a composite chronology comprising samples both from standing pine trees (Pinus sylvestris L.) and subfossil trunks as recovered from the lake sediments, with a total sample size of 189 tree-ring sample series. The series were dendrochronologically cross-dated to exact calendar years to portray variability in tree-ring widths on inter-annual and longer scales. Although the studied chronology correlates statistically significantly with other long tree-ring width chronologies from Finland over their common period (AD 1520-1993), the south-west chronology did not exhibit similarly strong mid-summer temperature or spring/early-summer precipitation signals in comparison to published chronologies. On the other hand, the south-west chronology showed highest correlations to the North Atlantic Oscillation indices in winter/spring months, this association following a dendroclimatic feature common to pine chronologies over the region and adjacent areas. Paleoclimatic comparison showed that tree-rings had varied similarly to central European spring temperatures. It is postulated that the collected and dated tree-ring material could be studied for wood surface reflectance (blue channel light intensity) and stable isotopes, which both have recently shown to correlate notable well with summer temperatures.
Authors and Affiliations
Samuli Helama, Jari Holopainen, Kari Mielikäinen, Mauri Timonen
Keywords
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- EP ID EP165253
- DOI 10.2478/squa-2014-0006
- Views 93
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