Université de Fribourg

Distinguishing ice-rich and ice-poor permafrost to map ground temperatures and ground ice occurrence in the Swiss Alps

Kenner, Robert ; Noetzli, Jeannette ; Hoelzle, Martin ; Raetzo, Hugo ; Phillips, Marcia

In: The Cryosphere, 2019, vol. 13, no. 7, p. 1925–1941

Mountain permafrost is invisible, and mapping it is still a challenge. Available permafrost distribution maps often overestimate the permafrost extent and include large permafrost-free areas in their permafrost zonation. In addition, the representation of the lower belt of permafrost consisting of ice-rich features such as rock glaciers or ice-rich talus slopes can be challenging. These...

Université de Fribourg

Permafrost is warming at a global scale

Biskaborn, Boris K. ; Smith, Sharon L. ; Noetzli, Jeannette ; Matthes, Heidrun ; Vieira, Gonçalo ; Streletskiy, Dmitry A. ; Schoeneich, Philippe ; Romanovsky, Vladimir E. ; Lewkowicz, Antoni G. ; Abramov, Andrey ; Allard, Michel ; Boike, Julia ; Cable, William L. ; Christiansen, Hanne H. ; Delaloye, Reynald ; Diekmann, Bernhard ; Drozdov, Dmitry ; Etzelmüller, Bernd ; Grosse, Guido ; Guglielmin, Mauro ; Ingeman-Nielsen, Thomas ; Isaksen, Ketil ; Ishikawa, Mamoru ; Johansson, Margareta ; Johannsson, Halldor ; Joo, Anseok ; Kaverin, Dmitry ; Kholodov, Alexander ; Konstantinov, Pavel ; Kröger, Tim ; Lambiel, Christophe ; Lanckman, Jean-Pierre ; Luo, Dongliang ; Malkova, Galina ; Meiklejohn, Ian ; Moskalenko, Natalia ; Oliva, Marc ; Phillips, Marcia ; Ramos, Miguel ; Sannel, A. Britta K. ; Sergeev, Dmitrii ; Seybold, Cathy ; Skryabin, Pavel ; Vasiliev, Alexander ; Wu, Qingbai ; Yoshikawa, Kenji ; Zheleznyak, Mikhail ; Lantuit, Hugues

In: Nature Communications, 2019, vol. 10, no. 1, p. 264

Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet to date, no globally consistent assessment of permafrost temperature change has been compiled. Here we use a global data set of permafrost temperature time series from the Global Terrestrial Network for Permafrost to evaluate temperature change across...

Université de Fribourg

Gap‐filling algorithm for ground surface temperature data measured in permafrost and periglacial environments

Staub, Benno ; Hasler, Andreas ; Noetzli, Jeannette ; Delaloye, andReynald

In: Permafrost and Periglacial Processes, 2017, vol. 28, no. 1, p. 275–285

Ground surface temperatures (GST) are widely measured in mountain permafrost areas, but their time series data can be interrupted by gaps. Gaps complicate the calculation of aggregates and indices required for analysing temporal and spatial variability between loggers and sites. We present an algorithm to estimate daily mean GST and the resulting uncertainty. The algorithm is designed to...

Université de Fribourg

Semi-automated calibration method for modelling of mountain permafrost evolution in Switzerland

Marmy, Antoine ; Rajczak, Jan ; Delaloye, Reynald ; Hilbich, Christin ; Hoelzle, Martin ; Kotlarski, Sven ; Lambiel, Christophe ; Noetzli, Jeannette ; Phillips, Marcia ; Salzmann, Nadine ; Staub, Benno ; Hauck, Christian

In: The Cryosphere, 2016, vol. 10, no. 6, p. 2693–2719

Permafrost is a widespread phenomenon in mountainous regions of the world such as the European Alps. Many important topics such as the future evolution of permafrost related to climate change and the detection of permafrost related to potential natural hazards sites are of major concern to our society. Numerical permafrost models are the only tools which allow for the projection of the future...