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Université de Fribourg

Permafrost model sensitivity to seasonal climatic changes and extreme events in mountainous regions

Marmy, Antoine ; Salzmann, Nadine ; Scherler, Martin ; Hauck, Christian

In: Environmental Research Letters, 2013, vol. 8, no. 3, p. 035048

Climate models project considerable ranges and uncertainties in future climatic changes. To assess the potential impacts of climatic changes on mountain permafrost within these ranges of uncertainty, this study presents a sensitivity analysis using a permafrost process model combined with climate input based on delta-change approaches. Delta values comprise a multitude of coupled air temperature...

Université de Fribourg

Modeled sensitivity of two alpine permafrost sites to RCM-based climate scenarios

Scherler, Martin ; Hauck, Christian ; Hoelzle, Martin ; Salzmann, Nadine

In: Journal of Geophysical Research: Earth Surface, 2013, vol. 18, no. 2, p. 780–794

Climate change as projected by contemporary general circulation models (GCMs) and regional climate models (RCMs) will have a great impact on high latitude and high mountain permafrost. A process-based one-dimensional permafrost model is used to evaluate the sensitivity of two characteristic alpine permafrost sites to changes in climate for a 110 year time period starting 1991 and ending 2100...

Université de Fribourg

Meltwater infiltration into the frozen active layer at an alpine permafrost site

Scherler, Martin ; Hauck, Christian ; Hoelzle, Martin ; Stähli, Manfred ; Völksch, Ingo

In: Permafrost and Periglacial Processes, 2011, vol. 21, no. 4, p. 325–334

A coupled heat and mass transfer model simulating mass and energy balance of the soil-snow-atmosphere boundary layer was applied to simulate ground temperatures, together with water and ice content evolution, in the active layer of an alpine permafrost site on Schilthorn, Swiss Alps. Abrupt shifts and subsequent fluctuations in ground temperature observed in alpine permafrost boreholes at the...