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Geology; November, 2007; v. 35; no. 11; p. 987-990; DOI: 10.1130/G23995A.1
© 2007 Geological Society of America
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Present-day temperatures in northern Scandinavia during the last glaciation

K.F. Helmens1, J.A.A. Bos2, S. Engels2, C.J. Van Meerbeeck2, S.J.P. Bohncke2, H. Renssen2, O. Heiri3, S.J. Brooks4, H. Seppä5, H.J.B. Birks6 and B. Wohlfarth7

1 Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden
2 Department of Paleoclimatology and Geomorphology, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands
3 Palaeoecology, Institute of Environmental Biology, Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestlaan 4, NL-3584 CD Utrecht, Netherlands
4 Department of Entomology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
5 Department of Geology, P.O. Box 64, FIN-00014 Helsinki, University of Helsinki, Finland
6 Department of Biology and Bjerknes Centre for Climate Research, University of Bergen, Allégaten 41, N-5007 Bergen, Norway, and Environmental Change Research Centre, University College, London WC1E 6BT, UK
7 Department of Geology and Geochemistry, Stockholm University, Stockholm SE-106 91, Sweden

Scandinavia is generally considered to have been covered extensively with ice throughout marine isotope stages (MIS) 4–2 between 75 and 10 ka. Here we present evidence for ice-free, warm conditions in the central area of the Scandinavian glaciations during MIS 3. Our multiproxy data obtained from a lacustrine sequence in northern Fin-land reveal not only significant response in the northeastern sector of the Scandinavian Ice Sheet to warming during the early part of MIS 3, but also indicate rapid climate warming to present-day temperatures in this ice-free period. New climate-model simulations for interstadial conditions in MIS 3 confirm the high mean July temperatures northeast of the Scandinavian Ice Sheet in response to the high insolation values and the presence of the ice sheet during MIS 3.

Key Words: climate variability • MIS 3 • Scandinavia • multiproxy • climate modeling






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