A palaeotemperature record for the Finnish Lakeland based on microdensitometric variations in tree rings
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Finnish Forest Research Institute, Northern Unit, Eteläranta 55, P.O. Box 16, 96301, Rovaniemi, Finland
Saima Centre for Environmental Sciences, Kuninkaankartanonkatu 5, P.O. Box 86, 57101, Savonlinna, Finland
Department of Geosciences and Geography, University of Helsinki, Gustaf Hällströmin katu 2a, P.O. Box 64, 00014, Helsinki, Finland
Finnish Meteorological Institute, Erik Palménin aukio 1, P.O. Box 503, 00101, Helsinki, Finland
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
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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