Rockglacier acceleration in the Turtmann valley (Swiss Alps): Probable controls
- 1 June 2005
- journal article
- research article
- Published by Taylor & Francis in Norsk Geografisk Tidsskrift - Norwegian Journal of Geography
- Vol. 59 (2), 157-163
- https://doi.org/10.1080/00291950510020655
Abstract
Temporal variations in mountain permafrost creep are discussed within a regional study on rockglacier 1 In order to emphasize the autonomy of the phenomenon, the term ‘rockglacier’ is expressed as one word in this article, in accordance with Barsch 1988 Barsch, D . 1988. “Rock glaciers”. In Advances in Periglacial Geomorphology, Edited by: Clark, M J . 69–90. Chichester : Wiley. [Google Scholar] . View all notes kinematics. On all investigated active rockglaciers in the Turtmann valley, a distinct acceleration of horizontal velocities has been recorded since the early 1990s. Since variations in rockglacier movement are mainly discussed in the context of temperature fluctuations in the current literature, the link between surface velocities and temperature development is investigated at two different scales. The signal of rockglacier speed-up in the period 1993–2001 (here termed as ‘regional signal’ since all rockglaciers show this behaviour) fits well with the general increase in air temperature recorded during the 1990s. On the local scale, the pattern of BTS values coincides well with the surface-velocity pattern, but in areas with high velocities the BTS temperatures are clearly below −3°C. Thus, marginal permafrost occurrence is not indicated in this data and the high velocities probably do not result directly from ‘warming’ permafrost conditions, as is suggested by other studies.Keywords
This publication has 11 references indexed in Scilit:
- Contribution of real‐time kinematic GPS in the study of creeping mountain permafrost: examples from the Western Swiss AlpsPermafrost and Periglacial Processes, 2004
- Borehole deformation measurements and internal structure of some rock glaciers in SwitzerlandPermafrost and Periglacial Processes, 2002
- Geometry and dynamics of two lobe-shaped rock glaciers in the permafrost of SvalbardNorsk Geografisk Tidsskrift - Norwegian Journal of Geography, 2002
- Regional temperature variability in the European Alps: 1760–1998 from homogenized instrumental time seriesInternational Journal of Climatology, 2001
- The effect of rise in mean annual temperature on the stability of rock slopes containing ice‐filled discontinuitiesPermafrost and Periglacial Processes, 2001
- Surface Geometry, Thickness Changes and Flow Fields on Creeping Mountain Permafrost: Automatic Extraction by Digital Image AnalysisPermafrost and Periglacial Processes, 2000
- Miniature temperature dataloggers for mapping and monitoring of permafrost in high mountain areas: first experience from the Swiss AlpsPermafrost and Periglacial Processes, 1999
- RockglaciersPublished by Springer Nature ,1996
- Permafrost occurrence from BTS measurements and climatic parameters in the eastern Swiss AlpsPermafrost and Periglacial Processes, 1992
- Les coulées de blocs du Parc national suisse d'Engadine (Note préliminaire)Le Globe. Revue genevoise de géographie, 1923