Geochronometria

, Volume 41, Issue 3, pp 265–277

A palaeotemperature record for the Finnish Lakeland based on microdensitometric variations in tree rings

  • Samuli Helama
  • Matti Vartiainen
  • Jari Holopainen
  • Hanna M. Mäkelä
  • Taneli Kolström
  • Jouko Meriläinen
Research Article

Abstract

X-ray based tree-ring data of maximum latewood densities (MXD) was combined for south-eastern Finland. This data originated from subfossil and modern pine (Pinus sylvestris L.) materials comprising a continuous dendroclimatic record over the past millennium. Calibrating and verifying the MXD chronologies against the instrumental temperature data showed a promising opportunity to reconstruct warm-season (May through September) temperature variability. A new palaeotemperature record correlated statistically significantly with the long instrumental temperature records in the region and adjacent areas since the 1740s. Comparisons with tree-ring based (MXD and tree-ring width) reconstructions from northern Fennoscandia and northern Finland exhibited consistent summer temperature variations through the Medieval Climate Anomaly, Little Ice Age, and the 20th century warmth. A culmination of the LIA cooling during the early 18th century appeared consistently with the Maunder Minimum, when the solar activity was drastically reduced. A number of coolest reconstructed events between AD 1407 and 1902 were coeval to years of crop failure and famine as documented in the agro-historical chronicles. Results indicate an encouraging possibility of warm-season temperature reconstructions using middle/south boreal tree-ring archives to detail and enhance the understanding of past interactions between humans, ecosystems and the earth.

Keywords

dendroclimatology geochronology Maunder Minimum Medieval Climate Anomaly Little Ice Age crop failure 

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Copyright information

© Versita Warsaw and Springer-Verlag Wien 2013

Authors and Affiliations

  • Samuli Helama
    • 1
  • Matti Vartiainen
    • 2
  • Jari Holopainen
    • 3
  • Hanna M. Mäkelä
    • 4
  • Taneli Kolström
    • 5
  • Jouko Meriläinen
    • 6
  1. 1.Finnish Forest Research InstituteNorthern UnitRovaniemiFinland
  2. 2.Saima Centre for Environmental SciencesSavonlinnaFinland
  3. 3.Department of Geosciences and GeographyUniversity of HelsinkiHelsinkiFinland
  4. 4.Finnish Meteorological InstituteHelsinkiFinland
  5. 5.Finnish Forest Research InstituteJoensuuFinland
  6. 6.SavonlinnaFinland

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