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A continuous, high-resolution 8500-yr snow-avalanche record from western Norway

Atle Nesje

Department of Earth Science, University of Bergen, Allégt. 41, Bjerknes Centre for Climate Research, Allégt. 55, N-5007 Bergen, Norway, atle.nesje{at}geo.uib.no

Jostein Bakke

Bjerknes Centre for Climate Research, Allégt. 55, N-5007 Bergen, Department of Geography, University of Bergen, Fosswinckelsgt. 6, N-5020 Bergen, Norway

Svein Olaf Dahl

Bjerknes Centre for Climate Research, Allégt. 55, N-5007 Bergen, Department of Geography, University of Bergen, Fosswinckelsgt. 6, N-5020 Bergen, Norway

Øyvind Lie

Bjerknes Centre for Climate Research, Allégt. 55, N-5007 Bergen, Norway

Anne-Grete Bøe

Bjerknes Centre for Climate Research, Allégt. 55, N-5007 Bergen, Norway

A record of Holocene snow-avalanche activity has been reconstructed from the presence of coarse (>1 mm) minerogenic particles in lake sediment cores retrieved from Vanndalsvatnet in western Norway. At this site, snow avalanches bring minerogenic debris and macroscopic plant remains from the adjacent valley side south of the lake onto the lake ice. When the lake ice melts during late spring, the debris sinks to the lake bottom. A flux record of the number of minerogenic particles >1mm per unit time, obtained by combining two sediment cores from the lake, shows a significant increase in snow-avalanche activity after ~2000 cal. BP. Prior to that, periods with enhanced snow-avalanche activity around the lake occurred ~8500-8300, 8200-7900, 7300-6300, 5900-5400, 5000-4600, 3700-3400, 3100-2800, 2700-2600 and 2500-2300 cal. BP. The snow-avalanche record from western Norway has been compared with a record of Holocene snow-avalanche activity in the Møre area in western Norway, a record of Holocene river floods in eastern Norway, and Holocene debris-flow events in southern Norway. Knowledge of the past magnitude and frequency of extreme weather events, such as snow avalanches, may help making climate model simulations and scenarios of extreme weather events more reliable.

Key Words: Snow avalanche • colluvial activity • extreme weather events • lake sediments • Holocene • western Norway

The Holocene, Vol. 17, No. 2, 269-277 (2007)
DOI: 10.1177/0959683607075855
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E. N. Storen, S. O. Dahl, and O. Lie
Separation of late-Holocene episodic paraglacial events and glacier fluctuations in eastern Jotunheimen, central southern Norway
The Holocene, December 1, 2008; 18(8): 1179 - 1191.
[Abstract] [PDF]