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Holocene climatic change reconstructed from diatoms, chironomids, pollen and near-infrared spectroscopy at an alpine lake (Sjuodjijaure) in northern Sweden
Peter Rosén
Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden; Climate Impacts Research Centre, Abisko Scientific Research Station, Box 62, SE-981 07 Abisko, Sweden; Peter.Rosen{at}eg.umu.se
Ulf Segerström
Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
Lars Eriksson
Department of Environmental Assessment, Swedish University of Agricultural Sciences, Box 7050, SE-750 07 Uppsala, Sweden
Ingemar Renberg
Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden
H. J.B. Birks
Botanical Institute, University of Bergen, Allégaten 41, N-5007 Bergen, Norway and Environmental Change Research Centre, University College London, London WC1H OAP, UK
The results of a multiproxy study reconstructing the climate history of the last 9300 years in northern Sweden are presented. It is based on diatom, chironomid and pollen analyses, as well as near-infrared spec troscopy (NIRS), of a radiocarbon dated sediment core from Sjuodjijaure (67°22N, 18°04E), situated 100 m above tree-line in the Scandes mountains. Mean July air temperature was reconstructed using transfer functions established for the region. The biological proxies show significant changes in composition during the Holocene and the inferred temperatures all follow the same general trend. For the period between about 9300 to 7300 cal. BP the reconstructions should be interpreted with caution due to the lack of convincing modern analogues in the training set. However the reconstruction suggest that July temperature was on average about the same as today, with several rapid short-term cold and warm periods. Cold periods were dated to about 8500, 8200 and 7600 cal. years BP and a warm period to about 7700 cal. BP. About 7300 cal. BP, a major shift to a warmer climate occurred. Pine migrated into the area, which was previously covered with birch forest. From the mid-Holocene until today the sediment record suggests a descending tree-limit and a gradual lowering of July temperature.
Key Words: Holocene climate • lake sediments • northern Sweden • pollen • chironomid • diatom • near-infrared spectroscopy
The Holocene, Vol. 11, No. 5,
551-562 (2001)
DOI: 10.1191/095968301680223503
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