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Université de Fribourg

Re-establishing glacier monitoring in Kyrgyzstan and Uzbekistan, Central Asia

Hoelzle, Martin ; Azisov, Erlan ; Barandun, Martina ; Huss, Matthias ; Farinotti, Daniel ; Gafurov, Abror ; Hagg, Wilfried ; Kenzhebaev, Ruslan ; Kronenberg, Marlene ; Machguth, Horst ; Merkushkin, Alexandr ; Moldobekov, Bolot ; Petrov, Maxim ; Saks, Tomas ; Salzmann, Nadine ; Schöne, Tilo ; Tarasov, Yuri ; Usubaliev, Ryskul ; Vorogushyn, Sergiy ; Yakovlev, Andrey ; Zemp, Michael

In: Geoscientific Instrumentation, Methods and Data Systems, 2017, vol. 6, no. 2, p. 397–418

Glacier mass loss is among the clearest indicators of atmospheric warming. The observation of these changes is one of the major objectives of the international climate monitoring strategy developed by the Global Climate Observing System (GCOS). Long-term glacier mass balance measurements are furthermore the basis for calibrating and validating models simulating future runoff of glacierised...

Université de Fribourg

Surge dynamics and lake outbursts of Kyagar Glacier, Karakoram

Round, Vanessa ; Leinss, Silvan ; Huss, Matthias ; Haemmig, Christoph ; Hajnsek, Irena

In: The Cryosphere, 2017, vol. 11, no. 2, p. 723–739

The recent surge cycle of Kyagar Glacier, in the Chinese Karakoram, caused formation of an ice-dammed lake and subsequent glacial lake outburst floods (GLOFs) exceeding 40 million m³ in 2015 and 2016. GLOFs from Kyagar Glacier reached double this size in 2002 and earlier, but the role of glacier surging in GLOF formation was previously unrecognised. We present an integrative analysis of...

Université de Fribourg

Common climatic signal from glaciers in the European Alps over the last 50 years

Vincent, C. ; Fischer, A. ; Mayer, C. ; Bauder, Andreas ; Galos, S. P. ; Funk, Martin ; Thibert, E. ; Six, D. ; Braun, L. ; Huss, Matthias

In: Geophysical Research Letters, 2017, vol. 44, no. 3, p. 1376–1383

Conventional glacier-wide mass balances are commonly used to study the effect of climate forcing on glacier melt. Unfortunately, the glacier-wide mass balances are also influenced by the glacier's dynamic response. Investigations on the effects of climate forcing on glaciers can be largely improved by analyzing point mass balances. Using a statistical model, we have found that 52% of the...

Université de Fribourg

Cross-comparison of albedo products for glacier surfaces derived from airborne and satellite (sentinel-2 and landsat 8) optical data

Naegeli, Kathrin ; Damm, Alexander ; Huss, Matthias ; Wulf, Hendrik ; Schaepman, Michael ; Hoelzle, Martin

In: Remote Sensing, 2017, vol. 9, no. 2, p. 110

Surface albedo partitions the amount of energy received by glacier surfaces from shortwave fluxes and modulates the energy available for melt processes. The ice- albedo feedback, influenced by the contamination of bare-ice surfaces with light- absorbing impurities, plays a major role in the melting of mountain glaciers in a warming climate. However, little is known about the spatial and...

Université de Fribourg

Monitoring of seasonal glacier mass balance over the European Alps using low-resolution optical satellite images

Drolon, Vanessa ; Maisongrande, Philippe ; Berthier, Etienne ; Wwinnen, Else ; Huss, Matthias

In: Journal of Glaciology, 2016, vol. 62, no. 235, p. 912–927

We explore a new method to retrieve seasonal glacier mass balances (MBs) from low- resolution optical remote sensing. We derive annual winter and summer snow maps of the Alps during 1998–2014 using SPOT/VEGETATION 1 km resolution imagery. We combine these seasonal snow maps with a DEM to calculate a ‘mean regional’ altitude of snow (Z) in a region surrounding a glacier. Then, we compare...

Université de Fribourg

Historical analysis and visualization of the retreat of Findelengletscher, Switzerland, 1859–2010

Rastner, P. ; Joerg, P.C. ; Huss, Matthias ; Zemp, Michael

In: Global and Planetary Change, 2016, vol. 145, p. 67–77

Since the end of the Little Ice Age around 1850, glaciers in Europe have strongly retreated. Thanks to early topographic surveys in Switzerland, accurate maps are available, which enable us to trace glacier changes back in time. The earliest map for all of Switzerland that is usable for a detailed analysis is the Dufour map from around 1850 with subsequent topographic maps on a ~ 20 year...

Université de Fribourg

Mass-balance reconstruction for Glacier No. 354, Tien Shan, from 2003 to 2014

Kronenberg, Marlene ; Barandun, Martina ; Hoelzle, Martin ; Huss, Matthias ; Farinotti, Daniel ; Azisov, Erlan ; Usubaliev, Ryskul ; Gafurov, Abror ; Petrakov, Dmitry ; Kääb, Andreas

In: Annals of Glaciology, 2016, vol. 57, no. 71, p. 92–102

This study presents a reconstruction of the seasonal mass balance of Glacier No. 354, located in the Akshiirak range, Kyrgyzstan, from 2003 to 2014. We use a distributed accumulation and temperature-index melt model driven by daily air temperature and precipitation from a nearby meteorological station. The model is calibrated with in situ measurements of the annual mass balance collected from...

Université de Fribourg

Montanaqua: tackling water stress in the alps: water management options in the crans-montana-sierre region (valais)

Schneider, Flurina ; Bonriposi, Mariano ; Graefe, Olivier ; Herweg, Karl ; Homewood, Christine ; Huss, Matthias ; Kauzlaric, Martina ; Liniger, Hanspeter ; Rey, Emmanuel ; Reynard, Emmanuel ; Rist, Stephan ; Schädler, Bruno ; Weingartner, Rolf

In: GAIA - Ecological Perspectives for Science and Society, 2016, vol. 25, no. 3, p. 191–193

Transdisciplinary research is considered an appropriate mode of knowledge production in the search for pathways towards a more sustainable governance of natural resources. However, the co-production of new knowledge between scientists of different disciplines and nonacademic stakeholders is a challenge that requires novel research designs, methods, and approaches. The MontanAqua team has ...

Université de Fribourg

Application and validation of long-range terrestrial laser scanning to monitor the mass balance of very small glaciers in the Swiss Alps

Fischer, Mauro ; Huss, Matthias ; Kummert, Mario ; Hoelzle, Martin

In: The Cryosphere, 2016, vol. 10, no. 3, p. 1279–1295

Due to the relative lack of empirical field data, the response of very small glaciers (here defined as being smaller than 0.5 km²) to current atmospheric warming is not fully understood yet. Investigating their mass balance, e.g. using the direct glaciological method, is a prerequisite to fill this knowledge gap. Terrestrial laser scanning (TLS) techniques operating in the near infrared...

Université de Fribourg

Sensitivity of very small glaciers in the Swiss Alps to future climate change

Huss, Matthias ; Fischer, Mauro

In: Cryospheric Sciences, 2016, p. 34

Very small glaciers (<0.5 km2) account for more than 80% of the total number of glaciers in mid- to low-latitude mountain ranges. Although their total area and volume is small compared to larger glaciers, they are a relevant component of the cryosphere, contributing to landscape formation, local hydrology, and sea-level rise. Worldwide glacier monitoring mostly focuses on medium-sized to large...