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| Titel |
Warming permafrost and active layer variability at Cime Bianche, Western European Alps |
| VerfasserIn |
P. Pogliotti, M. Guglielmin, E. Cremonese, U. Morra di Cella, G. Filippa, C. Pellet, C. Hauck |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 2 ; Nr. 9, no. 2 (2015-04-08), S.647-661 |
| Datensatznummer |
250116775
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| Publikation (Nr.) |
 copernicus.org/tc-9-647-2015.pdf |
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| Zusammenfassung |
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. |
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