RESEARCH PAPER
A palaeotemperature record for the Finnish Lakeland based on microdensitometric variations in tree rings
1
Finnish Forest Research Institute, Northern Unit, Eteläranta 55, P.O. Box 16, 96301, Rovaniemi, Finland
2
Saima Centre for Environmental Sciences, Kuninkaankartanonkatu 5, P.O. Box 86, 57101, Savonlinna, Finland
3
Department of Geosciences and Geography, University of Helsinki, Gustaf Hällströmin katu 2a, P.O. Box 64, 00014, Helsinki, Finland
4
Finnish Meteorological Institute, Erik Palménin aukio 1, P.O. Box 503, 00101, Helsinki, Finland
5
Finnish Forest Research Institute, Yliopistokatu 6, P.O. Box 68, 80101, Joensuu, Finland
Online publication date: 2014-06-22
Publication date: 2014-09-01
Geochronometria 2014;41(3):265-277
KEYWORDS
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.
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