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Forest Science Database

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Abstract

For a long time, tree-rings have been thought of as containing almost no variation at timescales of centuries and millennia, i.e. at low frequencies. Here, we show that this might be an issue of data analysis rather than an actual lack of variability. A data set of subfossil and living Scots pines...

Author(s)
Helama, S.; Timonen, M.; Lindholm, M.; Meriläinen, J.; Eronen, M.
Publisher
John Wiley & Sons, Chichester, UK
Citation
International Journal of Climatology, 2005, 25, 13, pp 1767-1779
Abstract

Tree-ring standardization methods were compared. Traditional methods along with the recently introduced approaches of regional curve standardization (RCS) and power-transformation (PT) were included. The difficulty in removing non-climatic variation (noise) while simultaneously preserving the...

Author(s)
Helama, S.; Lindholm, M.; Timonen, M.; Eronen, M.
Publisher
Springer-Verlag Wien, Wien, Austria
Citation
Theoretical and Applied Climatology, 2004, 79, 3/4, pp 239-254
Abstract

We performed a spatiotemporal analysis of a network of 21 Scots pine (Pinus sylvestris) ring-width chronologies in northern Fennoscandia by means of chronology statistics and multivariate analyses. Chronologies are located on both sides (western and eastern) of the Scandes Mountains (67°N-70°N,...

Author(s)
Macias, M.; Timonen, M.; Kirchhefer, A. J.; Lindholm, M.; Eronen, M.; Gutiérrez, E.
Publisher
Institute of Arctic and Alpine Research, Boulder, USA
Citation
Arctic, Antarctic, and Alpine Research, 2004, 36, 4, pp 565-574
Abstract

Midsummer (July) temperatures are reconstructed for the last 7500 years using the long ring-width chronology of Scots pine (Pinus sylvestris) from northern Finland. The chronology was built using regional curve standardization (RCS), which allows for long term (low-frequency) variability to be...

Author(s)
Helama, S.; Lindholm, M.; Timonen, M.; Meriläinen, J.; Eronen, M.
Publisher
Arnold, London, UK
Citation
Holocene, 2002, 12, 6, pp 681-687
Abstract

This paper reviews the development of the current 'supra-long' pine (Pinus) chronology for northern Finnish Lapland. In the forest-tundra ecotone region of northern Finnish Lapland over 250 samples from living Scots pines (Pinus sylvestris) and over 1700 samples of subfossil pines have been...

Author(s)
Eronen, M.; Zetterberg, P.; Briffa, K. R.; Lindholm, M.; Meriläinen, J.; Timonen, M.
Publisher
Arnold, London, UK
Citation
Holocene, 2002, 12, 6, pp 673-680
Abstract

Conclusive evidence for a rise in water levels has been found in connection with lake-sediment studies undertaken partly in collaboration with the pine megafossil sampling and dendrochronological work in northern Finnish Lapland. The change in lake level is shown by slow sedimentation rate in the...

Author(s)
Eronen, M.; Hyvärinen, H.; Zetterberg, P.
Citation
Holocene, 1999, 9, 5, pp 569-580