A 11,000 yr palaeotemperature reconstruction from the southern boreal zone in Finland |
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| Institution: | 1. Laboratory of Palaeoecology, Institute of Botany, Czech Academy of Sciences, Lidická 25/27, 602 00 Brno, Czech Republic;2. Department of Vegetation Ecology, Institute of Botany, Czech Academy of Sciences, Lidická 25/27, 602 00 Brno, Czech Republic;3. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;4. Department of Botany, Faculty of Science, Palacký University in Olomouc, ?lechtitel? 27, 783 71 Olomouc, Czech Republic;5. Institute of Archaeology and Museology, Faculty of Arts, Masaryk University, Arne Nováka 1/1, 602 00 Brno, Czech Republic;6. Department of Archaeology, Faculty of Arts, Comenius University in Bratislava, Gondova 2, 814 99 Bratislava, Slovakia;7. Department of Archaeology, Faculty of Arts, Constatine the Philosopher University in Nitra, Hod?ova 1, 949 74 Nitra, Slovakia;8. Department of Physical Geography and Geoecology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovi?ova 6, 842 15, Bratislava 4, Slovakia;9. Department of Geomagnetism, Institute of Geophysics, Czech Academy of Sciences, Bo?ní II/1401, 141 31 Praha 4, Czech Republic |
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| Abstract: | The ecotone between the boreo-nemoral (hemiboreal) and the southern boreal vegetation zones constitutes the northern distributional limit of a number of thermophilous tree species in northern Europe and is, to a large extent, controlled by climatic conditions. We present a quantitative annual mean temperature reconstruction from a high-resolution pollen stratigraphy in southern boreal Finland, using a pollen-climate calibration model with a cross-validated prediction error of 0.9°C. Our model reconstructs low but steadily rising annual mean temperature from 10,700 to 9000 cal yr BP. At 8000–4500 cal yr BP reconstructed annual mean temperature reaches a period of highest values (Holocene thermal maximum) with particularly high temperatures (2.0–1.5°C higher than at present) at 8000–5800 cal yr BP. From 4500 cal yr BP to the present-day, reconstructed annual mean temperature gradually decreases by ca 1.5°C. Comparison of present results with palaeotemperature records from the Greenland ice cores, notably with the NorthGRIP δ18O record, shows marked similarities, suggesting parallel large-scale Holocene temperature trends between the North Atlantic and North European regions. The verification of the occurrence, timing, and nature of the short-term temperature fluctuations during the Holocene in the southern boreal zone in Europe requires replicate, high-resolution climate reconstructions from the region. |
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