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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-41575

Haeberli, W (2010). Glaciological conditions in northern Switzerland during recent Ice Ages. Wettingen, CH.

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Abstract

Based primarily on reconstructions and various model calculations, quantitative estimates are compiled concerning ice conditions in northern Switzerland during the past Ice Age. The penetration of winter sea ice to low latitudes and the corresponding closure of the Atlantic Ocean as a humidity source caused extremely cold/dry conditions in central Europe during the time period of maximum cold and most extended area of surface ice. At this stage, the large lobes of the piedmont glaciers spreading out over much of the Swiss Plateau were predomi- nantly polythermal to cold, surrounded by continuous periglacial permafrost up to 150 m thick and characterised by low driving stresses (typically 30 to 50 kPa). Mass balance gradients, mass turnover and ice flow velocities on these piedmont glaciers were correspondingly low. Sub- surface temperatures and groundwater conditions were strongly influenced by the presence of extended surface and subsurface ice. Glacial erosion in the ice-marginal zones was probably limited due to strongly reduced basal sliding and melt-water flow. More humid conditions with higher flow velocities, more basal sliding and stronger erosion by abrasion and melt-water effects must have prevailed during ice advance across the Swiss Plateau, and rapid down- wasting or even collapse (calving instability in lakes) is likely to have taken place during the retreat phase back into the Alpine valleys. It appears plausible to assume that similar cycles were characteristic for past Ice Ages in general and could also be characteristic for future Ice Age conditions in northern Switzerland. Some key questions concerning effects of deep glacial erosion are formulated.

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Additional indexing

Item Type:Monograph
Communities & Collections:07 Faculty of Science > Institute of Geography
DDC:910 Geography & travel
Uncontrolled Keywords:Ice ages, ice age climate, paleoglaciology, periglacial, polythermal glaciers, permafrost, glacial erosion, sedimentation
Language:English
Date:2010
Deposited On:20 Jan 2011 10:31
Last Modified:26 Apr 2013 09:12
Publisher:Nationale Genossenschaft für die Lagerung radioaktiver Abfälle
Series Name:Technischer Bericht NTB
Volume:10-18
Number of Pages:28
Official URL:http://www.nagra.ch/g3.cms/s_page/78090/s_name/shopde

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