High-resolution analyses of recent sediments from a Norwegian mountain lake and comparison with instrumental records of climate |
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| Authors: | NG Cameron ØA Schnell ML Rautio A Lami DM Livingstone PG Appleby JA Dearing NL Rose |
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| Institution: | (1) Environmental Change Research Centre, Department of Geography, University College London, 26 Bedford Way, London, WC1H 0AP, UK;(2) Department of Zoology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway;(3) Department of Ecology and Systematics, Division of Hydrobiology, University of Helsinki, P.O. Box 17 (Arkadiankatu 7), FIN-00014 Helsinki, Finland;(4) CNR – Istituto Italiano di Idrobiologia, Largo Tonolli, 50-52, I-28048 Verbania, Pallanza, Italy;(5) Environmental Tracers Group, Water Resources Department, Swiss Federal Instiute of Environmental Science and Technology (EAWAG), Überlandstrasse 133, CH-8600 Dübendorf, Switzerland;(6) Department of Applied Mathematics and Theoretical Physics, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UK;(7) Environmental Magnetism Laboratory, Department of Geography, University of Liverpool, Liverpool, L69 3BX, UK |
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| Abstract: | The purpose of the palaeolimnological research project carried out at Øvre Neådalsvatn was to apply a number of physical and biological proxy-climate analyses to recent sediments and to compare the results of these analyses with instrumental records of climate. Using a radiometric chronology to match the sediment core with the calendar ages of the reconstructed instrumental record, and by time-averaging the instrumental record, the statistical significance of the relationships between each of the sediment-climate proxies and the reconstructed instrumental-climate measurements were evaluated.Acid deposition at Øvre Neådalsvatn has been low and its impact limited. Whilst there has been an overall rise in mean annual temperature of about 1 °C since 1900, the physical and biological sediment records studied appear to be insensitive to climate warming of this magnitude. On the one hand, this may be a result of the loss in temporal resolution caused by time-averaging the instrumental data; on the other hand, the lake may be insensitive to the impact of this climate change. |
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| Keywords: | mountain lake Norwegian Mountains diatoms cladocerans chironomids chrysophytes mineral magnetics carbonaceous particles pigments climate instrumental records |
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