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Université de Fribourg

Soil moisture impacts on convective indices and precipitation over complex terrain

Barthlott, Christian ; Hauck, Christian ; Schädler, Gerd ; Kalthoff, Norbert ; Kottmeier, Christoph

In: Meteorologische Zeitschrift, 2011, vol. 20, no. 2, p. 185-197

The impact of soil moisture on convective precipitation, convective indices, surface energy balance components, and near-surface meteorological variables is analysed for seven intensive observation periods of the Convective and Orographically induced Precipitation Study (COPS) conducted in summer 2007 using a non-hydrostatic limited-area atmospheric prediction model. The control runs are compared...

Université de Fribourg

Soil moisture variability and its influence on convective precipitation over complex terrain

Hauck, Christian ; Barthlott, Christian ; Krauss, Liane ; Kalthoff, Norbert

In: Quarterly Journal of the Royal Meteorological Society, 2011, vol. 137, no. S1, p. 42-56

Soil moisture monitoring data from the Convective and Orographically-induced Precipitation Study (COPS) 2007 are combined with operational and high-resolution simulations with the weather forecast system GME/COSMO-DE to analyse the discrepancies between observed and modelled soil moisture fields and their potential impacts on convective precipitation forecasts. We use data from the newly...

Université de Fribourg

Recent and future warm extreme events and high-mountain slope stability

Huggel, C. ; Salzmann, Nadine ; Allen, S. ; Caplan-Auerbach, J. ; Fischer, L. ; Haeberli, W. ; Larsen, C. ; Schneider, D. ; Wessels, R.

In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010, vol. 368, no. 1919, p. 2435-2459

The number of large slope failures in some high-mountain regions such as the European Alps has increased during the past two to three decades. There is concern that recent climate change is driving this increase in slope failures, thus possibly further exacerbating the hazard in the future. Although the effects of a gradual temperature rise on glaciers and permafrost have been extensively...

Université de Fribourg

Airborne particles in the urban environment

Grobéty, Bernard ; Gieré, Reto ; Dietze, Volker ; Stille, Peter

In: Elements, 2010, vol. 6, no. 4, p. 229-234

Particulate matter is an important constituent of our atmosphere and has a critical impact on natural processes and human health. Although they are a minor component of the average global mass flux, anthropogenic particles are abundant in the urban environment, where they contribute substantially to air pollution. Particulate matter is routinely monitored in urban areas, but different particle...

Université de Fribourg

100-year mass changes in the Swiss Alps linked to the Atlantic multidecadal oscillation

Huss, Matthias ; Hock, Regine ; Bauder, Andreas ; Funk, Martin

In: Geophysical Research Letters, 2010, vol. 37, p. L10501

Thirty new 100-year records of glacier surface mass balance, accumulation and melt in the Swiss Alps are presented. The time series are based on a comprehensive set of field data and distributed modeling and provide insights into the glacier-climate linkage. Considerable mass loss over the 20th century is evident for all glaciers, but rates differ strongly. Glacier mass loss shows multidecadal...

Université de Fribourg

Changes in wood anatomy in tree rings of Pinus pinaster Ait. following wounding by flash floods

Ballesteros, J.A. ; Stoffel, Markus ; Bodoque, J.M. ; Bollschweiler, Michelle ; Hitz, Oliver ; Díez-Herrero, A.

In: Tree-Ring Research, 2010, vol. 66, no. 2, p. 93-103

This paper analyzes the anatomical response of Pinus pinaster Ait. following wounding by flash floods. A total of 14 wood samples were taken from 14 different scarred trees located on the river banks of the Arroyo Cabrera torrent (Spanish Central System). In addition, 20 increment cores were collected from undisturbed and healthy P. pinaster trees to build a local reference chronology. For the...

Université de Fribourg

Snow accumulation distribution inferred from time-lapse photography and simple modelling

Farinotti, Daniel ; Magnusson, Jan ; Huss, Matthias ; Bauder, Andreas

In: Hydrological Processes, 2010, p. -

The spatial and temporal distribution of snow accumulation is complex and significantly influences the hydrological characteristics of mountain catchments. Many snow redistribution processes, such as avalanching, slushflow or wind drift, are controlled by topography, but their modelling remains challenging. In situ measurements of snow accumulation are laborious and generally have a coarse...

Université de Fribourg

Combined observations of rock mass movements using satellite SAR interferometry, differential GPS, airborne digital photogrammetry, and airborne photography interpretation

Strozzi, Tazio ; Delaloye, Reynald ; Kääb, Andreas ; Ambrosi, Christian ; Perruchoud, Eric ; Wegmüller, Urs

In: Journal of Geophysical Research, 2010, p. F01014

Recent global warming, through the related retreat of mountain glaciers, causes a growing number of different slope instabilities requiring accurate and cost-effective monitoring. We investigate the potential of combined remote sensing observations from satellite and airborne microwave and optical sensors for an efficient survey of mountainous ground displacements. The evolution of a paraglacial...