Chironomid-based palaeotemperature estimates for northeast Finland during Oxygen Isotope Stage 3 |
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| Authors: | S Engels S J P Bohncke J A A Bos S J Brooks O Heiri K F Helmens |
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| Institution: | (1) Department of Paleoclimatology and Geomorphology, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, Amsterdam, 1081 HV, The Netherlands;(2) Department of Entomology, The National History Museum, Cromwell Road, London, SW7 5BD, UK;(3) Palaeoecology, Laboratory of Palaeobotany and Palynology, Institute of Environmental Biology, Utrecht University, Budapestlaan 4, Utrecht, 3584 CD, The Netherlands;(4) Department of Physical Geography &; Quaternary Geology, Stockholm University, Stockholm, 106 91, Sweden |
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| Abstract: | Quantitative palaeotemperature estimates for the earlier part of Oxygen Isotope Stage (OIS-) 3 are inferred from subfossil
chironomid remains. The high-latitudinal study site of Sokli, northeast Finland, provides for a unique lacustrine deposit
covering the earlier part of OIS-3, and the chironomid remains found in the sediments show that a shallow lake with a diverse
fauna was present at the study site throughout the record. Using a Norwegian calibration data set as a modern analogue, mean
July air temperatures are reconstructed. The chironomid-inferred July air temperatures are surprisingly high, reaching values
similar to the current temperature at the study site. Other proxies that were applied to the sediments included the analysis
of botanical and zoological macro-remains, and our results concur with temperature estimates derived from climate indicator
taxa. Summer temperatures for interstadial conditions, reconstructed with climate models, are as high as our proxy-based palaeotemperatures. |
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| Keywords: | Chironomids Oxygen Isotope Stage 3 Climate change Summer temperature Northeast Finland |
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