Ground thermal regime and periglacial slope processes in Norway and Iceland
The ground thermal regime substantially influences geomorphological processes operating in periglacial environments, although the connection may not be straightforward. Recent studies provide more evidence for enhanced rockfall activity and accelerating rockslides in terrain underlain by thawing per...
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ftoslouniv:oai:www.duo.uio.no:10852/111063 2024-09-15T18:07:49+00:00 Ground thermal regime and periglacial slope processes in Norway and Iceland Czekirda, Justyna 2024 http://hdl.handle.net/10852/111063 en eng Paper I: Czekirda, J.,Westermann, S., Etzelmüller, B., and Jóhannesson, T. (2019). Transient Modelling of Permafrost Distribution in Iceland. Frontiers in Earth Science, 7. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.3389/feart.2019.00130 Paper II: Czekirda, J., Etzelmüller, B., Westermann, S., Isaksen, K., and Magnin, F. (2023). Post-Little Ice Age rock wall permafrost evolution in Norway. The Cryosphere, 17, 2725–2754. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.5194/tc-17-2725-2023 Paper III: Czekirda, J., Rempel, A.W., Etzelmüller, B., and Westermann, S. (2024). Spatiotemporal variations in frost cracking measures in two dimensions: A case study for rock walls in Jotunheimen, southern Norway. Geomorphology, 453, 109112. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.1016/j.geomorph.2024.109112 https://doi.org/10.3389/feart.2019.00130 https://doi.org/10.5194/tc-17-2725-2023 https://doi.org/10.1016/j.geomorph.2024.109112 http://hdl.handle.net/10852/111063 Doctoral thesis Doktoravhandling 2024 ftoslouniv https://doi.org/10.3389/feart.2019.0013010.5194/tc-17-2725-202310.1016/j.geomorph.2024.109112 2024-08-05T14:09:29Z The ground thermal regime substantially influences geomorphological processes operating in periglacial environments, although the connection may not be straightforward. Recent studies provide more evidence for enhanced rockfall activity and accelerating rockslides in terrain underlain by thawing permafrost. In contrast, there is an ongoing debate on the periglacial imprint for long-term landscape evolution. Furthermore, the concept of "frost cracking window", which refers to an optimal ground temperature range for frost weathering, was established over two decades ago to describe in a simple way the connection between frost weathering and ground temperature. Therefore, knowledge of the ground thermal regime is essential in the geomorphological context on both short- and long-term scales. This dissertation employs permafrost modelling, modelling of frost weathering, space-borne and ground-based remote sensing approaches as the main methods to investigate various concepts within cold-region geomorphology. Ground temperature is modelled using a one-dimensional heat flow model for Iceland and a two-dimensional heat flow model for rock walls in Norway. This modelling showed that Iceland’s shallow and warm permafrost and Norway’s rock wall permafrost are susceptible to the atmospheric warming that has been lasting since the 1980s. The number of cells with simulated permafrost in Iceland decreased by approximately 40 % between the 1980s and 2010–2016. The average warming of Norway’s rock walls has been 0.2 °C per decade at 20 m depth since the 1980s. Recent permafrost thawing in Norway and Iceland may have consequences for slope stability, rockslide and rock glacier dynamics, and lead to the disappearance of palsas. Sites with enhanced frost weathering were identified using the two-dimensional modelling of frost cracking performed for steep rock walls in Jotunheimen, southern Norway. Such sites are typically found between the rock wall and melting ice sheet or glaciers, as well as where the snow depth changes abruptly, ... Doctoral or Postdoctoral Thesis glacier glacier Ice Ice Sheet Iceland palsas permafrost The Cryosphere Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The ground thermal regime substantially influences geomorphological processes operating in periglacial environments, although the connection may not be straightforward. Recent studies provide more evidence for enhanced rockfall activity and accelerating rockslides in terrain underlain by thawing permafrost. In contrast, there is an ongoing debate on the periglacial imprint for long-term landscape evolution. Furthermore, the concept of "frost cracking window", which refers to an optimal ground temperature range for frost weathering, was established over two decades ago to describe in a simple way the connection between frost weathering and ground temperature. Therefore, knowledge of the ground thermal regime is essential in the geomorphological context on both short- and long-term scales. This dissertation employs permafrost modelling, modelling of frost weathering, space-borne and ground-based remote sensing approaches as the main methods to investigate various concepts within cold-region geomorphology. Ground temperature is modelled using a one-dimensional heat flow model for Iceland and a two-dimensional heat flow model for rock walls in Norway. This modelling showed that Iceland’s shallow and warm permafrost and Norway’s rock wall permafrost are susceptible to the atmospheric warming that has been lasting since the 1980s. The number of cells with simulated permafrost in Iceland decreased by approximately 40 % between the 1980s and 2010–2016. The average warming of Norway’s rock walls has been 0.2 °C per decade at 20 m depth since the 1980s. Recent permafrost thawing in Norway and Iceland may have consequences for slope stability, rockslide and rock glacier dynamics, and lead to the disappearance of palsas. Sites with enhanced frost weathering were identified using the two-dimensional modelling of frost cracking performed for steep rock walls in Jotunheimen, southern Norway. Such sites are typically found between the rock wall and melting ice sheet or glaciers, as well as where the snow depth changes abruptly, ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Czekirda, Justyna |
spellingShingle |
Czekirda, Justyna Ground thermal regime and periglacial slope processes in Norway and Iceland |
author_facet |
Czekirda, Justyna |
author_sort |
Czekirda, Justyna |
title |
Ground thermal regime and periglacial slope processes in Norway and Iceland |
title_short |
Ground thermal regime and periglacial slope processes in Norway and Iceland |
title_full |
Ground thermal regime and periglacial slope processes in Norway and Iceland |
title_fullStr |
Ground thermal regime and periglacial slope processes in Norway and Iceland |
title_full_unstemmed |
Ground thermal regime and periglacial slope processes in Norway and Iceland |
title_sort |
ground thermal regime and periglacial slope processes in norway and iceland |
publishDate |
2024 |
url |
http://hdl.handle.net/10852/111063 |
genre |
glacier glacier Ice Ice Sheet Iceland palsas permafrost The Cryosphere |
genre_facet |
glacier glacier Ice Ice Sheet Iceland palsas permafrost The Cryosphere |
op_relation |
Paper I: Czekirda, J.,Westermann, S., Etzelmüller, B., and Jóhannesson, T. (2019). Transient Modelling of Permafrost Distribution in Iceland. Frontiers in Earth Science, 7. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.3389/feart.2019.00130 Paper II: Czekirda, J., Etzelmüller, B., Westermann, S., Isaksen, K., and Magnin, F. (2023). Post-Little Ice Age rock wall permafrost evolution in Norway. The Cryosphere, 17, 2725–2754. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.5194/tc-17-2725-2023 Paper III: Czekirda, J., Rempel, A.W., Etzelmüller, B., and Westermann, S. (2024). Spatiotemporal variations in frost cracking measures in two dimensions: A case study for rock walls in Jotunheimen, southern Norway. Geomorphology, 453, 109112. The paper is included in the thesis in DUO, and also available at: https://doi.org/10.1016/j.geomorph.2024.109112 https://doi.org/10.3389/feart.2019.00130 https://doi.org/10.5194/tc-17-2725-2023 https://doi.org/10.1016/j.geomorph.2024.109112 http://hdl.handle.net/10852/111063 |
op_doi |
https://doi.org/10.3389/feart.2019.0013010.5194/tc-17-2725-202310.1016/j.geomorph.2024.109112 |
_version_ |
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