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Early Weichselian interstadial (MIS 5c) summer temperatures were higher than today in northern Fennoscandia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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2009 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 28, no 9-10, 777-782 p.Article in journal (Refereed) Published
Abstract [en]

Only fragmentary biostratigraphical interstaidial data exist from northern European high latitudes. The palaeoenvironmental interpretations for the early part of the Last Glaciation in northern Fennoscandia are mainly based on palynological evidence that suggests open birch woodland and a sub-arctic climate. Plant macrofossils from the Sokli sediment sequence in Finnish Lapland provide different evidence of interstadial climate conditions. The assemblage includes several species that currently have considerably more southern distribution ranges. This indicates that ca 100,000 years ago summer temperatures were warmer than today. The mean minimum July temperature may have been as high as 16 degrees C and the effective temperature sum may have been 1000 in day-degree units (d.d.), the modern values being 13 degrees C and 650 d.d., respectively. The contemporary astronomical forcing mechanisms may have resulted in a weaker north-south temperature gradient and a longer growing period, creating more favourable climate conditions compared with today.

Place, publisher, year, edition, pages
2009. Vol. 28, no 9-10, 777-782 p.
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Physical Geography Geosciences, Multidisciplinary
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URN: urn:nbn:se:su:diva-36058DOI: 10.1016/j.quascirev.2009.01.004ISI: 000265358200001OAI: oai:DiVA.org:su-36058DiVA: diva2:288688
Available from: 2010-01-21 Created: 2010-01-21 Last updated: 2017-12-12Bibliographically approved

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