Internal Structure and Current Evolution of Very Small Debris-Covered Glacier Systems Located in Alpine Permafrost Environments

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State: Public
Version: Final published version
Serval ID
serval:BIB_89BCCAD898EB
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Internal Structure and Current Evolution of Very Small Debris-Covered Glacier Systems Located in Alpine Permafrost Environments
Journal
Frontiers in Earth Science
Author(s)
Bosson J.-B., Lambiel C.
ISSN-L
2296-6463
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
4
Pages
1-17
Language
english
Abstract
This contribution explores the internal structure of very small debris-covered glacier systems located in permafrost environments and their current dynamical responses to short-term climatic variations. Three systems were investigated with electrical resistivity tomography and dGPS monitoring over a 3-year period. Five distinct sectors are highlighted in each system: firn and bare-ice glacier, debris-covered glacier, heavily debris-covered glacier of low activity, rock glacier and ice-free debris. Decimetric to metric movements, related to ice ablation, internal deformation and basal sliding affect the glacial zones, which are mainly active in summer. Conversely, surface lowering is close to zero (−0.04m yr−1) in the rock glaciers. Here, a constant and slow internal deformation was observed (c. 0.2m yr−1). Thus, these systems are affected by both direct and high magnitude responses and delayed and attenuated responses to climatic variations. This differential evolution appears mainly controlled by (1) the proportion of ice, debris and the presence of water in the ground, and (2) the thickness of the superficial debris layer.
Keywords
debris-covered glaciers, rock glaciers, permafrost, ground ice, electrical resistivity tomography, dGPS
Open Access
Yes
Create date
13/04/2016 12:49
Last modification date
20/08/2019 15:48
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