The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling
Ongoing climate change is impacting permafrost environments worldwide, causing a rise in ground temperatures and deepening of the active layer. These changes influence the stability of the ground, especially through their effect on ground ice content. Consequences include ground displacements such a...
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ftoslouniv:oai:www.duo.uio.no:10852/106005 2023-12-24T10:12:30+01:00 The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling Aga, Juditha 2023 http://hdl.handle.net/10852/106005 en eng Paper I: Aga, J., Piermattei, L., Girod, L., Aalstad, K., Eiken, T., Kääb, A. and Westermann, S. (2023): Coastal retreat rates of high-Arctic rock cliffs on Brøgger Peninsula, Svalbard, accelerate during the past decade. Manuscript in review (first round with major revisions) in Earth Surface Dynamics. doi:10.5194/egusphere-2023-321. An author version is included. A preprint is available at: https://doi.org/10.5194/egusphere-2023-321 Paper II: Schmidt, J., Etzelmüller, B., Schuler, T. V., Magnin, F., Boike, J., Langer, M. and Westermann, S. (2021): Surface temperatures and their influence on the permafrost thermal regime in high-Arctic rock walls on Svalbard. In: The Cryosphere. Vol. 15, pp. 2491-2509. doi:10.5194/tc-15-2491-2021. The article is included in the thesis. Also available at: https://doi.org/10.5194/tc-15-2491-2021 Paper III: Aga, J., Boike, J., Langer, M., Ingeman-Nielsen, T. and Westermann, S. (2023): Simulating ice segregation and thaw consolidation in permafrost environments with the CryoGrid community model. In: The Cryosphere. Vol. 17, pp. 4179-4206. doi:10.5194/tc-17-4179-2023. The article is included in the thesis. Also available at: https://doi.org/10.5194/tc-17-4179-2023 Paper IV: Aga, J. and Westermann, S. (2023): Simulating the climate-induced potential for active layer detachment slides in sloping permafrost terrain. Manuscript in preparation for submission. The paper is not available in DUO awaiting publishing. https://doi.org/10.5194/egusphere-2023-321 https://doi.org/10.5194/tc-15-2491-2021 https://doi.org/10.5194/tc-17-4179-2023 http://hdl.handle.net/10852/106005 Doctoral thesis Doktoravhandling 2023 ftoslouniv https://doi.org/10.5194/egusphere-2023-32110.5194/tc-15-2491-202110.5194/tc-17-4179-2023 2023-11-29T23:39:45Z Ongoing climate change is impacting permafrost environments worldwide, causing a rise in ground temperatures and deepening of the active layer. These changes influence the stability of the ground, especially through their effect on ground ice content. Consequences include ground displacements such as subsidence of the ground surface, slope failures and coastal erosion. This doctoral thesis investigates this complex system interaction based on both field observations and numerical modelling. Field observations on Svalbard show that the thermal regime of permafrost is dependent on local factors, such as the proximity to the sea. Furthermore, erosion of the coastal cliffs on the Brøgger peninsula has increased in recent years, a trend likely be attributable to changing climatic conditions. Numerical models are a simplification of the complex natural conditions, but contribute to our understanding of the underlying processes. Within this doctoral thesis, a new model scheme is developed that (i) computes a modified surface energy balance for sloping terrain, (ii) accounts for ground ice formation and thaw and (iii) performs a slope stability analysis. By coupling this model to atmospheric data, it is possible to evaluate the climate-dependency of ground ice formation and thaw in regions with permafrost, as well as slope stability in permafrost environments. Doctoral or Postdoctoral Thesis Arctic Ice permafrost Svalbard The Cryosphere Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Svalbard |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Ongoing climate change is impacting permafrost environments worldwide, causing a rise in ground temperatures and deepening of the active layer. These changes influence the stability of the ground, especially through their effect on ground ice content. Consequences include ground displacements such as subsidence of the ground surface, slope failures and coastal erosion. This doctoral thesis investigates this complex system interaction based on both field observations and numerical modelling. Field observations on Svalbard show that the thermal regime of permafrost is dependent on local factors, such as the proximity to the sea. Furthermore, erosion of the coastal cliffs on the Brøgger peninsula has increased in recent years, a trend likely be attributable to changing climatic conditions. Numerical models are a simplification of the complex natural conditions, but contribute to our understanding of the underlying processes. Within this doctoral thesis, a new model scheme is developed that (i) computes a modified surface energy balance for sloping terrain, (ii) accounts for ground ice formation and thaw and (iii) performs a slope stability analysis. By coupling this model to atmospheric data, it is possible to evaluate the climate-dependency of ground ice formation and thaw in regions with permafrost, as well as slope stability in permafrost environments. |
format |
Doctoral or Postdoctoral Thesis |
author |
Aga, Juditha |
spellingShingle |
Aga, Juditha The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
author_facet |
Aga, Juditha |
author_sort |
Aga, Juditha |
title |
The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
title_short |
The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
title_full |
The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
title_fullStr |
The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
title_full_unstemmed |
The thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
title_sort |
thermal regime and stability of permafrost in sloping terrain - observations and numerical modelling |
publishDate |
2023 |
url |
http://hdl.handle.net/10852/106005 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Arctic Ice permafrost Svalbard The Cryosphere |
genre_facet |
Arctic Ice permafrost Svalbard The Cryosphere |
op_relation |
Paper I: Aga, J., Piermattei, L., Girod, L., Aalstad, K., Eiken, T., Kääb, A. and Westermann, S. (2023): Coastal retreat rates of high-Arctic rock cliffs on Brøgger Peninsula, Svalbard, accelerate during the past decade. Manuscript in review (first round with major revisions) in Earth Surface Dynamics. doi:10.5194/egusphere-2023-321. An author version is included. A preprint is available at: https://doi.org/10.5194/egusphere-2023-321 Paper II: Schmidt, J., Etzelmüller, B., Schuler, T. V., Magnin, F., Boike, J., Langer, M. and Westermann, S. (2021): Surface temperatures and their influence on the permafrost thermal regime in high-Arctic rock walls on Svalbard. In: The Cryosphere. Vol. 15, pp. 2491-2509. doi:10.5194/tc-15-2491-2021. The article is included in the thesis. Also available at: https://doi.org/10.5194/tc-15-2491-2021 Paper III: Aga, J., Boike, J., Langer, M., Ingeman-Nielsen, T. and Westermann, S. (2023): Simulating ice segregation and thaw consolidation in permafrost environments with the CryoGrid community model. In: The Cryosphere. Vol. 17, pp. 4179-4206. doi:10.5194/tc-17-4179-2023. The article is included in the thesis. Also available at: https://doi.org/10.5194/tc-17-4179-2023 Paper IV: Aga, J. and Westermann, S. (2023): Simulating the climate-induced potential for active layer detachment slides in sloping permafrost terrain. Manuscript in preparation for submission. The paper is not available in DUO awaiting publishing. https://doi.org/10.5194/egusphere-2023-321 https://doi.org/10.5194/tc-15-2491-2021 https://doi.org/10.5194/tc-17-4179-2023 http://hdl.handle.net/10852/106005 |
op_doi |
https://doi.org/10.5194/egusphere-2023-32110.5194/tc-15-2491-202110.5194/tc-17-4179-2023 |
_version_ |
1786174744685445120 |