PEER-REVIEWED ARTICLES / Referoidut artikkelit

Helama, S., Holopainen, J., Macias-Fauria, M., Timonen, M. & Mielikäinen, K. 2013. A chronology of climatic downturns through the mid- and late- Holocene: tracing the distant effects of explosive eruptions from palaeoclimatic and historical evidence in northern Europe. Polar Research 2013, 32, 1586. Abstract / Pdf.

Timonen, M., Jiang, J., Helama, S. & Mielikäinen, K. 2013. Significant changes of subseries-means in the Finnish tree-ring index of 7638 years, with comparisons to glaciological evidence from Greenland and Alps. Quaternary International. Polar Research 2013, 32, 1586. Pdf.

Esper, J., Frank, D.C., Timonen, M., Zorita, E., Wilson, R.J.S., Luterbacher, J., Holzkämper, S., Fischer, N., Wagner, S., Nievergelt, D., Verstege, A., & Büntgen, U. 2012. Orbital forcing of tree-ring data. Nature Climate Change, doi: 10-1038/NCLIMATE1589. Check also: Climate in northern Europe reconstructed for the past 2,000 years: Cooling trend calculated precisely for the first time. Press Release of Johannes Gutenberg University.

Sutinen, R., Närhi, P., Middleton, M., Hänninen, P., Timonen, M. & Sutinen, M.-L. 2012. Advance of Norway spruce (Picea abies) onto mafic Lommoltunturi fell in Finnish Lapland during the last 200 years. Boreas. 10.1111/j.1502-3885.2011.00238.x. ISSN 0300-9483. Pdf

Esper, J., Büntgen, U., Timonen, M. & Frank, D.C. 2012. Variability and extremes of northern Scandinavian summer temperatures over the past two millennia. Global and Planetary Change 88–89 (2012) 1–9.

Läänelaid, A., Helama, S., Kulla, A., Timonen, M. & Jaagusa, J. 2012. Common growth signal and spatial synchrony of the chronologies of tree-rings from pines in the Baltic Sea region over the last nine centuries. Abstract / Pdf.

Büntgen, U., Raible. CC., Frank, D., Helama, S., Cunningham, L., Hofer, D., Nievergelt, D., Verstege, A., Timonen, M., Stenseth, N. C. & Esper, J. 2011. Causes and Consequences of Past and Projected Scandinavian Summer Temperatures, 500–2100 AD. PLoS ONE 6(9), doi: 10.1371/journal.phone.0025133. Abstract and Pdf.

Shumilov, O. I., Kasatkina, E. A., Mielikäinen, K. J., Timonen, M. I. & Kanatjev, A. G. 2011. Palaeovolcanos, solar activity, and pine tree-rings from the Kola Peninsula (northwestern Russia) over the last 560 years. International Journal of Environmental Research. V5. 5, Issue 3, 2011.  Abstract and Pdf.

Sutinen, R., Närhi, P., Middleton, M., Kuoppamaa, M., Juntunen, V., Hyvönen, E., Hänninen, P., Teirilä, A., Pänttäjä, M., Neuvonen, S., Äikää, O., Piekkari, M., Timonen, M. & Sutinen, M.-L. 2011. Geological controls on subarctic conifer distribution. Geological Survey of Finland, Special Paper 49, 315–325. Pdf.

Raspopov, O. M., Dergachev, V. A., Ogurtsov, M. G., Kolström, T., Jungner, H., Dmitriev, B. P. 2011. Variations in climate parameters at time intervals from hundreds to tens of millions of years in the past and its relation to solar activity. Pdf.

Helama S., Macias Fauria M., Mielikäinen K., Timonen M. & Eronen M. 2010. Sub-Milankovitch Solar Forcing of Past Climates: Mid and Late Holocene Perspectives.Geological Society of America Bulletin. This version was published on November 1, 2010. Link to the GSW Website for downloads.

Raspopov, O. M., Dergachev, V. A., Kolström, T. & Jungner. H. 2010. Solar Activity and Climatic Variability in the Time Interval from 10 to 250 Ma Ago. ISSN 0016,7932, Geomagnetism and Aeronomy, 2010, Vol. 50, No. 2, pp. 141–152. © Pleiades Publishing, Ltd., 2010. Original Russian Text published in Geomagnetizm i Aeronomiya, 2010, Vol. 50, No. 2, pp. 147–158. Pdf.

Helama, S., Meriläinen, J. & Tuomenvirta, H. 2009. Multicentennial megadrought in northern Europe coincided with a global El Niño–Southern Oscillation drought pattern during the Medieval Climate Anomaly DOI 10.1130/G25329A. Abstract / Pdf.

Macias-Fauria, M., Grinsted A., Helama,S., Moore, J., Timonen, M., Martma T., Isaksson E.  & Eronen, M. 2009. Unprecedented low twentieth century winter sea ice extent in the Western Nordic Seas since A.D. 1200. Climate Dynamics Volume 34, Number 6, 781-795, DOI: 10.1007/s00382-009-0610-z. Abstract / Pdf.

Helama, S., Timonen, M., Holopainen, J., Ogurtsov, M. G., Mielikäinen, K., Eronen, M., Lindholm, M. & Meriläinen, J. 2009. Summer temperature variations in Lapland during the Medieval Warm Period and the Little Ice Age relative to natural instability of thermohaline circulation on multi-decadal and multi-centennial scales. J. Quaternary Sci., Vol. 24 pp. 450–456. ISSN 0267-8179. Abstract / Pdf.

Helama, S., Makarenko, N. G., Karimova L. M., Kruglun, O. A., Timonen, M., Holopainen, J., Meriläinen, J. & Eronen, M. 2009. Dendroclimatic transfer functions revisited: Little Ice Age and Medieval Warm Period summer temperatures reconstructed using artificial neural networks and linear algorithms Ann. Geophys., 27, 1097–1111, 2009. www.ann-geophys.net/27/1097/2009/ Abstract / Pdf.

Macias Fauria, M., Helle, T., Niva, A., Posio, H. & Timonen, M. 2008. Removal of the lichen mat by reindeer enhances tree growth in a northern Scots pine forest. Abstract / Pdf.

Helama, S., Mielikäinen, K., Timonen, M.& Eronen, M. 2008. Finnish supra-long tree-ring chronology extended to 5634 BC. Norsk Geografisk Tidsskrift - Norwegian Journal of Geography,62:4,271 — 277. Abstract / Pdf.

Helama S., Jiang J., Korhonen J., Holopainen J. & Timonen M. 2008. Climatic control of cryophenology as recorded in historical break-up variability of Tornionjoki River. Cold Regions Science and Technology. Submitted.

Raspopov, O. M., Dergachev, V. A., Kuzmin, A. V., Kozyreva, O. V., Ogurtsov, M. G., Kolström, T, & Lopatin, E. 2007. Regional tropospheric responses to long-term solar activity variations. Advances in Space Research 40 (2007) 1167–1172. 0273-1177/$30, 2007 COSPAR. doi:10.1016/j.asr.2007.01.081 Abstract / Pdf.

Raspopov,O. M., Dergachev, Kolström, T, Kuzmin, V. A., Lopatin, E.V & Lisitsyna, O. V. 2007. Long-term solar activity variations as a stimulator of abrupt climate change. RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 9, ES3002, doi:10.2205/2007ES000250, 2007 Abstract / Pdf.

Sutinen, R., Aro, I., Herva, H., Muurinen, T., Piekkari, M. & Timonen, M. 2007. Macrofossil evidence dispute ubiquitous birch-pine-spruce succession in Western Finnish Lapland. Applied Quaternary research in the central part of glaciated terrain,edited by Peter Johansson and Pertti Sarala. Geological Survey of Finland, Special Paper 46, X–XX, 2007. Pdf.

Salzer, M.W. & Hughes, M. K. 2007. Bristlecone pine tree rings and volcanic eruptions over the last 5000 yr. Quaternary Research 67 (2007) 57–68. Pdf.

Holopainen, J. 2006. Reconstructions of past climates from documentary and natural sources in Finland since the 18th century. Academic Dissertation. University of Helsinki. Pdf.

Holopainen, J., Helama, S. & Timonen, M. 2006. Plant phenological data and tree-rings as palaeoclimate indicators since AD 1750 in SW Finland. International Journal of Biometeorology 51: 61-72. Pdf.

Karimovaa, L., Kuandykova, Y., Makarenko, N., Novak, M. M. & Helama, S. 2006. Fractal and topological dynamics for the analysis of paleoclimatic records. Physica A 373 (2007) 737–746. Pdf.

Kultti, S., Mikkola, K., Virtanen, T., Timonen, M. & Eronen, M. 2006. Past changes in the Scots pine forest line and climate in Finnish Lapland: a study based on megafossils, lake sediments, and GIS-based vegetation and climate data. The Holocene 16(3): 381-391. Pdf.

Helama, S., Lindholm, M., Timonen, M. & Eronen, M. 2005. Mid- and late Holocene tree population density changes in northern Fennoscandia derived by a new method using megafossil pines and their tree-ring series. Journal of Quaternary Science (2005) 20(6):567–575. Copyright 2005 John Wiley & Sons, Ltd. Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jqs.929. Pdf.

Helama, S., Timonen, M., Lindholm, M., Meriläinen, J. & Eronen, M. 2005. Extracting long-period climate fluctuations from tree-ring chronologies over timescales of centuries to millennia. International Journal of Climatology 25 (13): 1767-1779. Pdf.

Helama, S., Lindholm M., Meriläinen J., Timonen M. & Eronen M. 2005. Multicentennial ring-width chronologies of Scots pine along north-south gradient across Finland. Tree-Ring Research, Volume 61(1):21-32. Pdf.

Ogurtsov, M., Helama, S., Eronen, M. & Lindholm, M. 2005. Centennial-to-millennial fluctuations in July temperatures in North Finland as recorded by timberline tree rings of Scots pine. Quaternary Research 63 (2005) 182– 188. Pdf.

Raspopov, O. M., Dergachev, V. A. & Kolström, T. 2004. Hale cyclicity of solar activity and its relation to climate variability. Solar Physics (2004) 224: 455–463. Springer 2005. Abstract / Pdf.

Helama, S., Lindholm M., Timonen M. & Eronen M. 2004. Dendrochronologically dated changes in the limit of pine in northernmost Finland during the past 7.5 millennia. Boreas 33 (3): 250-259. Pdf

Holopainen J., Timonen M., Ogurtsov M. G., Lindholm M., Meriläinen J. & Eronen M. 2004. Comparison of living-tree and subfossil ring-widths with summer temperatures from 18th,19th and 20th centuries in northern Finland. Dendrochronologia 21 (3): 147-154. Pdf.

Lindholm M., Timonen M. & Eronen M. 2004. Detection of climate signal in dendrochronological data analysis: a comparison of tree-ring standardization methods. Theoretical and Applied Climatology 79 (3-4): 239-254. Pdf.

Macias, M.,Timonen, M., Kirchhefer, A., Lindholm, M., Eronen, M. & Gutierrez, E. 2004. Growth variability of Scots pine along a West-East Gradient across Northern Fennoscandia: A Dendroclimatic Approach. Arctic, Antarctic, and Alpine Research, 36:565-574. Pdf.

Varmola, M., Hyppönen, M., Mäkitalo, K., Mikkola, K. & Timonen, M. 2004. Forest management and regeneration success in protection forests near the timberline in Finnish Lapland. Forest Research 19(5): 424-441.

Varmola, M., Salminen H. & Timonen, M. 2004. Thinning response and growth trends of seeded Scots pine stands at the arctic timberline. Silva Fennica 38(1):71-83. Pdf. Tutkimusseloste. Pdf.

Hyppönen, M., Varmola, M.,Juntunen, V., Lohi, T., Mikkola, K., Mäkitalo, K. & Timonen, M. 2003. Metsien uudistuminen suojametsäalueella. Metsätieteen aikakauskirja 1/2003: 31-45. Pdf.

Ogurtsov, M.G., Jungner, H., Kocharov, G.E., Lindholm, M., Eronen, M. & Nagovitsyn, Yu. 2003. On the link between northern Fennoscandial climate and length of the quasi- eleven-year cycle in galactic cosmic ray flux. Solar Physics 218 (1-2): 345-357. Pdf.

Eronen, M., Lindholm, M., Helama; S., Meriläinen, J. & Timonen, M. 2002. Summary of the strengths and weaknesses of the millennial tree-ring archive of Fennoscandian forest-limit Scots Pine. Pdf.

Eronen, M., Zetterberg, P., Briffa, K., Lindholm, M., Meriläinen, J. & Timonen M. 2002. Part 1: The supra-long Scots pine tree-ring record for northern Finnish Lapland; Chronology construction and initial inferences. The Holocene 12(6): 673-680. Abstract / Pdf.

Helama, S., Lindholm, M., Timonen, M., Eronen, M. & Meriläinen, J. 2002. Part 2: Interannual-to-centennial variability in summer temperatures in northern Fennoscandia during the last 7500 years extracted from tree-rings of Scots pine. The Holocene 12(6): 681-687. Pdf.

Ogurtsov, M.G., Kocharov, G.E., Lindholm, M., Meriläinen, J. & Eronen, M. 2002. Evidence of solar variation in the tree-ring based climate reconstruction of northern Fennoscandia. Solar Physics 205 (2): 403-417). Pdf.

Helle, T., Kojola, I & Timonen, M.2001. Lumipeitteen vaikutus Käsivarren porolukuihin: mikä on Pohjois-Atlantin säänvaihtelun (NAO) merkitys? Suomen Riista 47:75-85.

Ogurtsov, M.G. Kocharov, G.E., Lindholm, M., Eronen, M. & Nagovitsyn, Yu., A. 2001. Solar activity and regional climate in northern Fennoscandia. Radiocarbon. 43, 144-156.

Lindholm, M., Eggertsson, Ò., Lovelius, N., Raspopov, O., Shumilov, O. & Läänelaid, A. 2001. Growth indices of North European Scots pine record the seasonal North Atlantic Oscillation. Boreal Environment Research 6: 275-284.

Lindholm, M.,Eronen, M. & Timonen, M. 2000. Growth variability during the last 7500 years interpreted from the supra-long ring-width chronology of Scots pine from northern Fennoscandia. University of Joensuu, Faculty of Forestry. Research Notes 108: 53-63.

Lindholm, M.,Lehtonen, H., Kolström, T., Meriläinen, J., Eronen, M. & Timonen, M. 2000. Climatic signals extracted from ring-width chronologies of Scots pines from the northern, middle and southern parts of the boreal forest belt in Finland. Silva Fennica 34(4): 317-330. Pdf.

Eronen, M., Hyvärinen, H. & Zetterberg P. 1999. Holocene humidity changes in northern Finnish Lapland inferred from lake sediments and submerged Scots pines dated by tree-rings

Lindholm, M., Eronen, M. & Timonen, M. & Meriläinen, J. 1999. A ring-width chronology of Scots pine from northern Lapland covering the last two millennia. Annales Botanici Fennici 36: 119

Lindholm, M., Meriläinen, J. , Timonen, M., Vanninen, P. & Eronen, M. 1997. Effects of climate on the growth of Scots pine in the Saimaa lake district, south-eastern Finland, in the southern part of the boreal forest belt. Dendrochronologia 15: 151-168.

Lindholm, M. 1996. Reconstruction of past climate from ring-width chronologies of Scots pine (Pinus sylvestris L.) at the northern forest limit in Fennoscandia. Ph.D. thesis. University of Joensuu, Publications in Sciences 40: 1-169.

Lindholm, M., Timonen, M. & Meriläinen, J. 1996. Extracting mid-summer temperatures from ring-width chronologies of living pines at the northern forest limit in Fennoscandia. Dendrochronologia

Mielikäinen, K., Timonen, M. & Nöjd, P. 1996. Männyn ja kuusen kasvun vaihtelu Suomessa 1964-1993.Folia Forestalia – Metsätieteen aikakauskirja 1996(4):309-320. Pdf.

Mielikäinen, K. & Timonen, M. 1996. Growth Trends of Scots pine (Pinus sylvestris, L.) in Unmanaged and Regularly Managed Stands in Southern and Central Finland. Julkaisussa: Spiecker, H., Köhl, M., Mielikäinen, K. & Skovsgaard, J.P. (toim.). Growth Trends in European Forests. European Forest Institute Research Report No. 5, European Forest Institute. 19 s.

Pohtila, E. & Timonen, M. 1981. Suojametsäalueen viljelytaimikot ja niiden varhaiskehitys. Scots pine plantations and their early development in the protection forests in Finnish Lapland. FF453. 18 s. Pdf.