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Forest Science Database

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Abstract

To assess past climate variability in west-central Scandinavia, a new 972-year-long temperature reconstruction, based on adjusted delta blue intensity (ΔBIadj), was created. Presently, it is the longest blue intensity chronology in Fennoscandia and the third longest in the northern hemisphere....

Author(s)
Fuentes, M.; Salo, R.; Björklund, J.; Seftigen, K.; Zhang Peng; Gunnarson, B.; Aravena, J. C.; Linderholm, H. W.
Publisher
Sage Publications Ltd, London, UK
Citation
Holocene, 2018, 28, 2, pp 254-266
Abstract

Stable carbon isotope ratios (δ13C) in tree rings have been increasingly used as indicators of climatic and ecological processes. However, compared to inter-annual δ13C variability, the factors related to inter-tree and -site variability (i.e., dendroclimatic noise) have attracted less attention....

Author(s)
Helama, S.; Arppe, L.; Hyvönen, J.; Mielikäinen, K.; Oinonen, M.
Publisher
The Geochemical Society of Japan, Tokyo, Japan
Citation
Geochemical Journal, 2018, 52, 4, pp 287-298
Abstract

Ongoing changes in global climate are altering ecological conditions for many species. The consequences of such changes are typically most evident at the edge of a species' geographical distribution, where differences in growth or population dynamics may result in range expansions or contractions....

Author(s)
Matías, L.; Linares, J. C.; Sánchez-Miranda, Á.; Jump, A. S.
Publisher
Wiley, Oxford, UK
Citation
Global Change Biology, 2017, 23, 10, pp 4106-4116
Abstract

Despite the spatially homogenous summer temperature pattern in Fennoscandia, there are large spreads among the many existing reconstructions, resulting in an uncertainty in the timing and amplitude of past changes. Also, there has been a general bias towards northernmost Fennoscandia. In an attempt ...

Author(s)
Linderholm, H. W.; Björklund, J.; Seftigen, K.; Gunnarson, B. E.; Fuentes, M.
Publisher
Springer Berlin, Heidelberg, Germany
Citation
Climate Dynamics, 2015, 45, 3/4, pp 933-947
Abstract

Tree-ring data of individual trees show lifelong biological trends as a function of cambial age. The compilation of a tree-ring chronology entails standardization (detrending) of the series. Tree-ring standardization commonly derives detrended series of dimensionless tree-ring data that are devoid...

Author(s)
Helama, S.
Publisher
Society of American Foresters, Bethesda, USA
Citation
Forest Science, 2015, 61, 5, pp 817-828
Abstract

In this study, wood anatomy, tree-ring width and wood density of Pinus sylvestris at the northern timberline in Fennoscandia were used to identify relationships among the parameters and to screen them for their climatic signals. Furthermore we investigated the influence of the juvenile wood section ...

Author(s)
Pritzkow, C.; Heinrich, I.; Grudd, H.; Helle, G.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2014, 32, 4, pp 295-302
Abstract

For the first time we identify the peculiarities of the effect of the most powerful (VEI >5) volcanic eruptions on the regional climate of the Murmansk region on the basis of Kola Peninsula dendrochronological data for a period of more than 560 years. The analysis was based on the tree-ring...

Author(s)
Kasatkina, E. A.; Shumilov, O. I.; Timonen, M.; Kanatjev, A. G.
Publisher
MAIK Nauka/Interperiodica Publishing, Moscow, Russia
Citation
Izvestiya, Atmospheric and Oceanic Physics, 2013, 49, 4, pp 432-438
AbstractFull Text

Tree-ring data is commonly used in forest science and dendrochronology. As the collected datasets represent restricted populations of theoretical infinite sample size, an interesting question deals with the sample selection that is carried out during the fieldwork and through the data analyses....

Author(s)
Timonen, M.; Mielikäinen, K.; Helama, S.
Publisher
Institute of Forestry and Rural Engineering, Estonian Agricultural University, Tartu, Estonia
Citation
Forestry Studies / Metsanduslikud Uurimused, 2012, 56, pp 5-15
Abstract

This proceedings comprises 14 papers presenting the usefulness of dendrochronology in providing information on scientific questions about the past and to help prepare for the future. These papers focused on growth ring chronology of different trees, indicators of mid-Holocene climate variability,...

Author(s)
Helama, S.; Devall, M. S.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 67-194
Abstract

New data have allowed us to extend a previous height-increment chronology of Scots pine (Pinus sylvestris L.) at the northern Fennoscandian timberline 817 years backwards in time, from 1561 to 745. Our final transfer model accounts for 31% of the dependent instrumental (mean June-August)...

Author(s)
Lindholm, M.; Jalkanen, R.; Salminen, H.; Aalto, T.; Ogurtsov, M.
Publisher
Sage Publications Ltd, London, UK
Citation
Holocene, 2011, 21, 2, pp 319-326

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