Browsing Institutt for geofag by Author "Isaksen, Ketil"

Now showing items 1-9 of 9

  • Changes in winter warming events in the Nordic Arctic Region 
    Vikhamar-Schuler, Dagrun; Isaksen, Ketil; Haugen, Jan Erik; Tømmervik, Hans; Luks, Bartlomiej; Schuler, Thomas Vikhamar; Bjerke, Jarle W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    In recent years extreme winter warming events have been reported in arctic areas. These events are characterized as extraordinarily warm weather episodes, occasionally combined with intense rainfall, causing ecological ...
  • Climate and environmental change drives Ixodes ricinus geographical expansion at the northern range margin 
    Jore, Solveig; Vanwambeke, Sophie O; Viljugrein, Hildegunn; Isaksen, Ketil; Kristoffersen, Anja B; Woldehiwet, Zerai; Johansen, Bernt; Brun, Edgar; Brun-Hansen, Hege; Westermann, Sebastian; Larsen, Inger-Lise; Ytrehus, Bjørnar; Hofshagen, Merete (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Background Global environmental change is causing spatial and temporal shifts in the distribution of species and the associated diseases of humans, domesticated animals and wildlife. In the on-going debate ...
  • Measured and modeled historical precipitation trends for Svalbard 
    Førland, Eirik; Isaksen, Ketil; Lutz, Julia; Hanssen-Bauer, Inger; Schuler, Thomas Vikhamar; Dobler, Andreas; Gjelten, Herdis M.; Vikhamar-Schuler, Dagrun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Abstract Precipitation plays an important role in the Arctic hydrological cycle, affecting different areas like the surface energy budget and the mass balance of glaciers. Thus, accurate measurements of precipitation are ...
  • Permafrost distribution in steep rock slopes in Norway: measurements, statistical modelling and implications for geomorphological processes 
    Magnin, Florence; Etzelmüller, Bernd; Westermann, Sebastian; Isaksen, Ketil; Hilger, Paula; Hermanns, Reginald (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Permafrost in steep rock slopes has been increasingly studied since the early 2000s in conjunction with a growing number of rock slope failures, which likely resulted from permafrost degradation. In Norway, rock slope ...
  • 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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    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 ...
  • Post-Little Ice Age rock wall permafrost evolution in Norway 
    Czekirda, Justyna; Etzelmüller, Bernd; Westermann, Sebastian; Isaksen, Ketil; Magnin, Florence (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The ground thermal regime and permafrost development have an important influence on geomorphological processes in periglacial regions and ultimately landscape development. About 10 % of unstable rock slopes in Norway are ...
  • Rapid warming and degradation of mountain permafrost in Norway and Iceland 
    Etzelmüller, Bernd; Isaksen, Ketil; Czekirda, Justyna; Westermann, Sebastian; Hilbich, Christin; Hauck, Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract. With the EU-funded PACE (Permafrost and Climate in Europe) project at the turn of this century, several deep boreholes (100 m+) were drilled in European mountain sites, including in mainland Norway, Svalbard and ...
  • Simulating the effect of subsurface drainage on the thermal regime and ground ice in blocky terrain in Norway 
    Renette, Cas; Aalstad, Kristoffer; Aga, Juditha; Zweigel, Robin Benjamin; Etzelmüller, Bernd; Lilleøren, Karianne Staalesen; Isaksen, Ketil; Westermann, Sebastian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract. Ground temperatures in coarse, blocky deposits such as mountain blockfields and rock glaciers have long been observed to be lower in comparison with other (sub)surface material. One of the reasons for this negative ...
  • Twenty years of European mountain permafrost dynamics-the PACE legacy 
    Etzelmüller, Bernd; Guglielmin, Mauro; Hauck, Christian; Hilbich, Christin; Hoelzle, Martin; Isaksen, Ketil; Noetzli, Jeannette; Oliva, Marc; Ramos, Miguel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    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 ...