Université de Fribourg

Modelling glacier-bed overdeepenings and possible future lakes for the glaciers in the Himalaya—Karakoram region

Linsbauer, Andreas ; Frey, H. ; Haeberli, Winfried ; Machguth, Horst ; Azam, M. F. ; Allen, S.

In: Annals of Glaciology, 2016, vol. 57, no. 71, p. 119–130

Surface digital elevation models (DEMs) and slope-related estimates of glacier thickness enable modelling of glacier-bed topographies over large ice-covered areas. Due to the erosive power of glaciers, such bed topographies can contain numerous overdeepenings, which when exposed following glacier retreat may fill with water and form new lakes. In this study, the bed overdeepenings for ~28 000...

Université de Fribourg

Potential climatic transitions with profound impact on Europe: review of the current state of six ‘tipping elements of the climate system’

Levermann, Anders ; Bamber, Jonathan L. ; Drijfhout, Sybren ; Ganopolski, Andrey ; Haeberli, Winfried ; Harris, Neil R. P. ; Huss, Matthias ; Krüger, Kirstin ; Lenton, Timothy M. ; Lindsay, Ronald W. ; Notz, Dirk ; Wadhams, Peter ; Weber, Susanne

In: Climatic Change, 2011, vol. 110, no. 3-4, p. 845-878

We discuss potential transitions of six climatic subsystems with large-scale impact on Europe, sometimes denoted as tipping elements. These are the ice sheets on Greenland and West Antarctica, the Atlantic thermohaline circulation, Arctic sea ice, Alpine glaciers and northern hemisphere stratospheric ozone. Each system is represented by co-authors actively publishing in the corresponding field....