Centennial-to-millennial fluctuations in July temperatures in North Finland as recorded by timberline tree rings of Scots pine |
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| Authors: | Maxim Ogurtsov Markus Lindholm |
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| Institution: | a Cosmic Ray Laboratory, A.F. Ioffe Physico-Technical Institute, 194021, Blytechnicheskaya 26, St. Petersburg, Russia
b Department of Geology, University of Helsinki, PO Box 64, FIN-00014 Helsinki, Finland |
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| Abstract: | A tree-ring proxy of summer temperature anomalies for northern Finland for the past 7500 yr was analyzed using Fourier spectrum and wavelet approaches. Multicentennial (250-450 yr) variability is present in the proxy record during most of the time range. This variability is suggested to reflect low-frequency variability in the North Atlantic Oscillation. Century-scale (90-130 yr) variation is another important feature of the tree-ring proxy data during the Holocene and may be attributed to Glessberg solar activity variations. In addition, an approximately 2000-yr quasi-period is found in this temperature proxy data, similar to the millennial-scale variability, present in many climate records from the North Atlantic region. The results point to the importance of multiple forcings underlying significant Holocene climatic fluctuations. |
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| Keywords: | July North Finland Scots pine Tree rings |
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