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Signature of explosive volcanic eruptions in the sediments of a high-altitude Swiss lake

Blass, Alex ; Grosjean, Martin ; Livingstone, David ; Sturm, Michael

In: Journal of Paleolimnology, 2008, vol. 39, no. 1, p. 35-42

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    Titre
    • Signature of explosive volcanic eruptions in the sediments of a high-altitude Swiss lake
    Auteur
    • Blass, Alex. Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Ueberlandstrasse 133, 8600, Dübendorf, Switzerland
    • Grosjean, Martin. National Centre of Excellence in Research on Climate, University of Berne, 3012, Berne, Switzerland
    • Livingstone, David. Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Ueberlandstrasse 133, 8600, Dübendorf, Switzerland
    • Sturm, Michael. Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Ueberlandstrasse 133, 8600, Dübendorf, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Paleolimnology, 2008, vol. 39, no. 1, p. 35-42. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:317257
    Summary
    The analysis of 125years of well-dated varved sediments in Lake Silvaplana, located at 1,791m 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