Université de Fribourg

Twenty years of European mountain permafrost dynamics—the PACE legacy

Etzelmüller, Bernd ; Guglielmin, Mauro ; Hauck, Christian ; Hilbich, Christin ; Hoelzle, Martin ; Isaksen, Ketil ; Noetzli, Jeanette ; Oliva, Marc ; Ramos, Miguel

In: Environmental Research Letters, 2020, vol. 15, no. 10, p. 104070

This paper reviews and analyses the past 20 years of change and variability of European mountain permafrost in response to climate change based on time series of ground temperatures along a south–north transect of deep boreholes from Sierra Nevada in Spain (37°N) to Svalbard (78°N), established between 1998 and 2000 during the EU-funded PACE (Permafrost and Climate in Europe) project. In...

Université de Fribourg

Northern Hemisphere permafrost map based on TTOP modelling for 2000–2016 at 1 km2 scale

Obu, Jaroslav ; Westermann, Sebastian ; Bartsch, Annett ; Berdnikov, Nikolai ; Christiansen, Hanne H. ; Dashtseren, Avirmed ; Delaloye, Reynald ; Elberling, Bo ; Etzelmüller, Bernd ; Kholodov, Alexander ; Khomutov, Artem ; Kääb, Andreas ; Leibman, Marina O. ; Lewkowicz, Antoni G. ; Panda, Santosh K. ; Romanovskyh, Vladimir ; Wayk, Robert G. ; Westergaard-Nielsen, Andreas ; Wu, Tonghua ; Yamkhin, Jambaljav ; Zou, Defu

In: Earth-Science Reviews, 2019, vol. 193, p. 299–316

Permafrost is a key element of the cryosphere and an essential climate variable in the Global Climate Observing System. There is no remote-sensing method available to reliably monitor the permafrost thermal state. To estimate permafrost distribution at a hemispheric scale, we employ an equilibrium state model for the temperature at the top of the permafrost (TTOP model) for the 2000–2016...

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

Degrading mountain permafrost in southern Norway: spatial and temporal variability of mean ground temperatures, 1999–2009

Isaksen, Ketil ; Ødegård, Rune Strand ; Etzelmüller, Bernd ; Hilbich, Christin ; Hauck, Christian ; Farbrot, Herman ; Eiken, Trond ; Hygen, Hans Olav ; Hipp, Tobias Florian

In: Permafrost and Periglacial Processes, 2011, vol. 22, no. 2, p. 361–377

A ten-year record (1999–2009) of annual mean ground surface temperatures (MGSTs) and mean ground temperatures (MGTs) was analysed for 16 monitoring sites in Jotunheimen and on Dovrefjell, southern Norway. Warming has occurred at sites with cold permafrost, marginal permafrost and deep seasonal frost. Ongoing permafrost degradation is suggested both by direct temperature monitoring and indirect...