Signature of explosive volcanic eruptions in the sediments of a high-altitude Swiss lake |
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Authors: | Alex Blass Martin Grosjean David M. Livingstone Michael Sturm |
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Affiliation: | (1) Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Ueberlandstrasse 133, 8600 Dübendorf, Switzerland;(2) National Centre of Excellence in Research on Climate, University of Berne, 3012 Berne, Switzerland;(3) Department of Physical Geography, University of Berne, 3012 Berne, Switzerland |
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Abstract: | The analysis of 125 years of well-dated varved sediments in Lake Silvaplana, located at 1,791 m a.s.l. in the Upper Engadine region of south-eastern Switzerland, reveals that 7 out of the 8 climatically relevant explosive volcanic eruptions between A.D. 1880 and 2004 were followed by distinct peaks in median grain-size. Although the underlying mechanisms are yet unclear, an analysis of local meteorological data suggests that this phenomenon is unlikely to be related to any change in air temperature associated with the eruptions, but instead may be related to an increase in autumn precipitation subsequent to the eruptions that led to the erosion and fluvial transport of particles larger than normal. |
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Keywords: | Volcanism Eruption Climate Limnogeology Sediment Alps Lake Grain-size |
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