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Centennial-to-millennial fluctuations in July temperatures in North Finland as recorded by timberline tree rings of Scots pine

Published online by Cambridge University Press:  20 January 2017

Maxim Ogurtsov ,
Samuli Helama ,
Matti Eronen  and
Markus Lindholm
Maxim Ogurtsov
Affiliation:
Cosmic Ray Laboratory, A.F. Ioffe Physico-Technical Institute, 194021, Blytechnicheskaya 26, St. Petersburg, Russia
Samuli Helama
Affiliation:
Department of Geology, University of Helsinki, PO Box 64, FIN-00014 Helsinki, Finland
Matti Eronen
Affiliation:
Department of Geology, University of Helsinki, PO Box 64, FIN-00014 Helsinki, Finland
Markus Lindholm*
Affiliation:
Department of Geology, University of Helsinki, PO Box 64, FIN-00014 Helsinki, Finland
*
*Corresponding author.E-mail addresses:maxim.ogurtsov@mail.ioffe.ru (M. Ogurtsov), markus.lindolm@goensuu.fi (M. Lindholm).
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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.

Keywords

JulyNorth FinlandScots pineTree rings
Type
Short Papers
Information
Quaternary Research , Volume 63 , Issue 2 , March 2005 , pp. 182 - 188
Copyright
University of Washington

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