In: Global and Planetary Change, 2004, vol. 44, p. 73-81
The heat wave that affected many parts of Europe during the course of summer 2003 may be a harbinger of summers that could occur more regularly in a future climate, under enhanced greenhouse gas concentrations. Switzerland was not exempt from the 2003 heat wave and, indeed, the previous absolute maximum temperature record dating back to the middle of the 20th century was exceeded by over 2 °C....
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In: Geophysical Research Letters, 2004, vol. 31, p. L02202
The 2003 heat wave that affected much of Europe from June to September bears a close resemblance to what many regional climate models are projecting for summers in the latter part of the 21st century. Model results suggest that under enhanced atmospheric greenhouse-gas concentrations, summer temperatures are likely to increase by over 4°C on average, with a corresponding increase in the...
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Thèse de doctorat : Université de Fribourg, 2001 ; no 1365.
The major aim of this study is to describe in a detailed manner the 20th century minimum and maximum temperature variations in Switzerland and to assess whether the magnitude of the secular warming and its interannual to interdecadal fluctuations show common seasonal patterns in different climatological regions. In a first step different climatological regions could successfully be...
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In: Environmental Conservation, 1993, vol. 20, no. 3, p. 267-269
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In: Journal of Geophysical Research, 2003, vol. 108, no. 13, p. 1-16
The implementation of a physically based parameterization scheme for computation of wind gusts in a numerical regional climate model (RCM) is described in this paper. The method is based on an innovative approach proposed by Brasseur [2001] that assumes that gusts occurring at the surface result from the deflection of air parcels flowing higher in the boundary layer. Our parameterization scheme...
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In: Geophysical research letters, 2006, vol. 33, p. L0570
The intense convective storms that affected the Swiss Alps in late August 2005 resulted in what has been referred to as the “floods of the century” (i.e., the past 100 years). While exceptional in terms of their intensity, the 2005 storms do not appear to be anchored within any long-term trends; there are no more intense storms today than a century ago. Despite uncertainties related to...
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In: Meteorological Applications, 2005, vol. 12, p. 77
Astronomical research at present requires that a telescope with an aperture diameter of between 50 and 100 metres be constructed within the next 10 years or so. This new generation of telescopes will be called OWL (Overwhelmingly Large), and it represents one order of magnitude increase in size over today's telescopes. Selection of an ideal site for this giant telescope is dependent on many...
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In: Dendrochronologia, 2002, vol. 20, no. 1, p. 117-131
This paper provides a brief overview of certain issues related to climate modeling and the role that dendrochronology can play, and has already played, in this context. Modeling is an essential approach to investigating the future evolution of the climate system in response to human activities. Tree-ring chronologies, on the other hand, have the capability of providing key parameters for...
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In: Environmental Conservation, 1991, vol. 18, no. 4, p. 360-363
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In: Climatic Change, 2003, vol. 59, no. 1, p. 5-31
This paper addresses a number of issues related to current and future climatic change and its impacts on mountain environments and economies, focusing on the `Mountain Regions' Chapter 13 of Agenda 21, a basis document presented at the 1992 United Nations Conference on Environment and Development (UNCED) in Rio de Janeiro, and the International Year of the Mountains (IYM) 2002. The awareness...
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