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Université de Fribourg

A general theory of rock glacier creep based on in-situ and remote sensing observations

Cicoira, Alessandro ; Marcer, Marco ; Gärtner‐Roer, Isabelle ; Bodin, Xavier ; Arenson, Lukas U. ; Vieli, Andreas

In: Permafrost and Periglacial Processes, 2020, p. -

The ongoing acceleration in rock glacier velocities concurrent with increasing air temperatures, and the widespread onset of rock glacier destabilization have reinforced the interest in rock glacier dynamics and in its coupling to the climate system. Despite the increasing number of studies investigating this phenomenon, our knowledge of both the fundamental mechanisms controlling rock...

Université de Fribourg

Anthropogenic climate change and glacier lake outburst flood risk: local and global drivers and responsibilities for the case of lake Palcacocha, Peru

Huggel, Christian ; Carey, Mark ; Emmer, Adam ; Frey, Holger ; Walker-Crawford, Noah ; Wallimann-Helmer, Ivo

In: Natural Hazards and Earth System Sciences, 2020, vol. 20, no. 8, p. 2175–2193

Evidence of observed negative impacts on natural and human systems from anthropogenic climate change is increasing. However, human systems in particular are dynamic and influenced by multiple drivers and hence identifying an anthropogenic climate signal is challenging. Here we analyze the case of lake Palcacocha in the Andes of Peru, which offers a representative model for other glacier lakes...

Université de Fribourg

Glacier runoff variations since 1955 in the Maipo River basin, in the semiarid Andes of central Chile

Ayala, Álvaro ; Farías-Barahona, David ; Huss, Matthias ; Pellicciotti, Francesca ; McPhee, James ; Farinotti, Daniel

In: The Cryosphere, 2020, vol. 14, no. 6, p. 2005–2027

As glaciers adjust their size in response to climate variations, long-term changes in meltwater production can be expected, affecting the local availability of water resources. We investigate glacier runoff in the period 1955–2016 in the Maipo River basin (4843 km2, 33.0–34.3∘ S, 69.8–70.5∘ W), in the semiarid Andes of Chile. The basin contains more than 800 glaciers, which...

Université de Fribourg

Estimating glacier-bed overdeepenings as possible sites of future lakes in the de-glaciating Mont Blanc massif (Western European Alps)

Magnin, F. ; Haeberli, W. ; Linsbauer, Andreas ; Deline, P. ; Ravanel, L.

In: Geomorphology, 2020, vol. 350, p. 106913

De-glaciating high mountain areas result in new landscapes of bedrock and debris where permafrost can degrade, persist or even newly form in cases, and of new lakes in glacier bed overdeepenings (GBOs) becoming ice-free. These landscapes with new lakes in close neighborhood to over-steepened and perennially frozen slopes are prone to chain reaction processes (e.g. rock-ice avalanches into...

Université de Fribourg

Potential future lakes from continued glacier shrinkage in the Aosta Valley Region (Western Alps, Italy)

Viani, Cristina ; Machguth, Horst ; Huggel, Christian ; Godio, Alberto ; Franco, Diego ; Perotti, Luigi ; Giardino, Marco

In: Geomorphology, 2020, vol. 355, p. 107068

Aosta Valley (Western Alps, Italy) is the region with the largest glacierized area of Italy. Like other high mountain regions, it has shown a significant glacier retreat starting from the end of the ‘Little Ice Age’ that is expected to continue in the future. As a direct consequence of glacier shrinkage, glacier-bed overdeepenings become exposed, offering suitable geomorphological ...

Université de Fribourg

On the imbalance and response time of glaciers in the european alps

Zekollari, Harry ; Huss, Matthias ; Farinotti, Daniel

In: Geophysical Research Letters, 2020, vol. 47, no. 2, p. e2019GL085578

Glaciers in the European Alps rapidly lose mass to adapt to changes in climate conditions. Here, we investigate the relationship and lag between climate forcing and geometric glacier response with a regional glacier evolution model accounting for ice dynamics. The volume loss occurring as a result of the glacier‐climate imbalance increased over the early 21st century, from about 35% in...

Université de Fribourg

Future retreat of Great Aletsch Glacier

Jouvet, Guillaume ; Huss, Matthias

In: Journal of Glaciology, 2019, vol. 65, no. 253, p. 869–872

We model the future evolution of the largest glacier of the European Alps – Great Aletsch Glacier, Switzerland – during the 21st century. For that purpose we use a detailed three-dimensional model, which combines full Stokes ice dynamics and surface mass balance forced with the most recent climate projections (CH2018), as well as with climate data of the last decades. As a result, all...

Université de Fribourg

Last phase of the Little Ice Age forced by volcanic eruptions

Brönnimann, Stefan ; Franke, Jörg ; Nussbaumer, Samuel U. ; Zumbühl, Heinz J. ; Steiner, Daniel ; Trachsel, Mathias ; Hegerl, Gabriele C. ; Schurer, Andrew ; Worni, Matthias ; Malik, Abdul ; Flückiger, Julian ; Raible, Christoph C.

In: Nature Geoscience, 2019, vol. 12, no. 8, p. 650–656

During the first half of the nineteenth century, several large tropical volcanic eruptions occurred within less than three decades. The global climate effects of the 1815 Tambora eruption have been investigated, but those of an eruption in 1808 or 1809 whose source is unknown and the eruptions in the 1820s and 1830s have received less attention. Here we analyse the effect of the sequence of...