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The Cryosphere An interactive open-access journal of the European Geosciences Union
The Cryosphere, 9, 647-661, 2015
https://doi.org/10.5194/tc-9-647-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
08 Apr 2015
Warming permafrost and active layer variability at Cime Bianche, Western European Alps
P. Pogliotti1, M. Guglielmin2, E. Cremonese1, U. Morra di Cella1, G. Filippa1, C. Pellet3, and C. Hauck3 1Environmental Protection Agency of Valle d'Aosta, Saint Christophe, Italy
2Department of Theoretical and Applied Sciences, Insubria University, Varese, Italy
3Department of Geosciences, University of Fribourg, Fribourg, Switzerland
Abstract. The objective of this paper is to provide a first synthesis on the state and recent evolution of permafrost at the monitoring site of Cime Bianche (3100 m a.s.l.) on the Italian side of the Western Alps. The analysis is based on 7 years of ground temperature observations in two boreholes and seven surface points. The analysis aims to quantify the spatial and temporal variability of ground surface temperature in relation to snow cover, the small-scale spatial variability of the active layer thickness and current temperature trends in deep permafrost.

Results show that the heterogeneity of snow cover thickness, both in space and time, is the main factor controlling ground surface temperatures and leads to a mean range of spatial variability (2.5 ± 0.1 °C) which far exceeds the mean range of observed inter-annual variability (1.6 ± 0.1 °C). The active layer thickness measured in two boreholes at a distance of 30 m shows a mean difference of 2.0 ± 0.1 m with the active layer of one borehole consistently deeper. As revealed by temperature analysis and geophysical soundings, such a difference is mainly driven by the ice/water content in the sub-surface and not by the snow cover regimes. The analysis of deep temperature time series reveals that permafrost is warming. The detected trends are statistically significant starting from a depth below 8 m with warming rates between 0.1 and 0.01 °C yr−1.


Citation: Pogliotti, P., Guglielmin, M., Cremonese, E., Morra di Cella, U., Filippa, G., Pellet, C., and Hauck, C.: Warming permafrost and active layer variability at Cime Bianche, Western European Alps, The Cryosphere, 9, 647-661, https://doi.org/10.5194/tc-9-647-2015, 2015.
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Short summary
This study presents the thermal state and recent evolution of permafrost at Cime Bianche. The analysis reveals that (i) spatial variability of MAGST is greater than its interannual variability and is controlled by snow duration and air temperature during the snow-free period, (ii) the ALT has a pronounced spatial variability caused by a different subsurface ice and water content, and (iii) permafrost is warming at significant rates below 8m of depth.
This study presents the thermal state and recent evolution of permafrost at Cime Bianche. The...
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