Lateral thermokarst patterns in permafrost peat plateaus in northern Norway
Subarctic peatlands underlain by permafrost contain significant amounts of organic carbon. Our ability to quantify the evolution of such permafrost landscapes in numerical models is critical for providing robust predictions of the environmental and climatic changes to come. Yet, the accuracy of larg...
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ftzenodo:oai:zenodo.org:6593245 2023-05-15T16:37:31+02:00 Lateral thermokarst patterns in permafrost peat plateaus in northern Norway Léo Martin Jan Nitzbon Johanna Scheer Kjetil Aas Trond Eiken Moritz Langer Simon Filhol Bernd Etzelmüller Sebastian Westermann 2021-07-22 https://zenodo.org/record/6593245 https://doi.org/10.5194/tc-15-3423-2021 unknown https://zenodo.org/communities/nunataryuk https://zenodo.org/record/6593245 https://doi.org/10.5194/tc-15-3423-2021 oai:zenodo.org:6593245 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article publication-article 2021 ftzenodo https://doi.org/10.5194/tc-15-3423-2021 2023-03-11T00:31:42Z Subarctic peatlands underlain by permafrost contain significant amounts of organic carbon. Our ability to quantify the evolution of such permafrost landscapes in numerical models is critical for providing robust predictions of the environmental and climatic changes to come. Yet, the accuracy of large-scale predictions has so far been hampered by small-scale physical processes that create a high spatial variability of thermal surface conditions, affecting the ground thermal regime and thus permafrost degradation patterns. In this regard, a better understanding of the small-scale interplay between microtopography and lateral fluxes of heat, water and snow can be achieved by field monitoring and process-based numerical modeling. Here, we quantify the topographic changes of the Šuoššjávri peat plateau (northern Norway) over a three-year period using drone-based repeat high-resolution photogrammetry. Our results show thermokarst degradation is concentrated on the edges of the plateau, representing 77 % of observed subsidence, while most of the inner plateau surface exhibits no detectable subsidence. Based on detailed investigation of eight zones of the plateau edge, we show that this edge degradation corresponds to an annual volume change of 0.13±0.07 m3 yr−1 per meter of retreating edge (orthogonal to the retreat direction). Using the CryoGrid3 land surface model, we show that these degradation patterns can be reproduced in a modeling framework that implements lateral redistribution of snow, subsurface water and heat, as well as ground subsidence due to melting of excess ice. By performing a sensitivity test for snow depths on the plateau under steady-state climate forcing, we obtain a threshold behavior for the start of edge degradation. Small snow depth variations (from 0 to 30 cm) result in highly different degradation behavior, from stability to fast degradation. For plateau snow depths in the range of field measurements, the simulated annual volume changes are broadly in agreement with the results of the drone ... Article in Journal/Newspaper Ice Northern Norway Peat Peat plateau permafrost Subarctic Thermokarst Zenodo Norway The Cryosphere 15 7 3423 3442 |
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description |
Subarctic peatlands underlain by permafrost contain significant amounts of organic carbon. Our ability to quantify the evolution of such permafrost landscapes in numerical models is critical for providing robust predictions of the environmental and climatic changes to come. Yet, the accuracy of large-scale predictions has so far been hampered by small-scale physical processes that create a high spatial variability of thermal surface conditions, affecting the ground thermal regime and thus permafrost degradation patterns. In this regard, a better understanding of the small-scale interplay between microtopography and lateral fluxes of heat, water and snow can be achieved by field monitoring and process-based numerical modeling. Here, we quantify the topographic changes of the Šuoššjávri peat plateau (northern Norway) over a three-year period using drone-based repeat high-resolution photogrammetry. Our results show thermokarst degradation is concentrated on the edges of the plateau, representing 77 % of observed subsidence, while most of the inner plateau surface exhibits no detectable subsidence. Based on detailed investigation of eight zones of the plateau edge, we show that this edge degradation corresponds to an annual volume change of 0.13±0.07 m3 yr−1 per meter of retreating edge (orthogonal to the retreat direction). Using the CryoGrid3 land surface model, we show that these degradation patterns can be reproduced in a modeling framework that implements lateral redistribution of snow, subsurface water and heat, as well as ground subsidence due to melting of excess ice. By performing a sensitivity test for snow depths on the plateau under steady-state climate forcing, we obtain a threshold behavior for the start of edge degradation. Small snow depth variations (from 0 to 30 cm) result in highly different degradation behavior, from stability to fast degradation. For plateau snow depths in the range of field measurements, the simulated annual volume changes are broadly in agreement with the results of the drone ... |
format |
Article in Journal/Newspaper |
author |
Léo Martin Jan Nitzbon Johanna Scheer Kjetil Aas Trond Eiken Moritz Langer Simon Filhol Bernd Etzelmüller Sebastian Westermann |
spellingShingle |
Léo Martin Jan Nitzbon Johanna Scheer Kjetil Aas Trond Eiken Moritz Langer Simon Filhol Bernd Etzelmüller Sebastian Westermann Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
author_facet |
Léo Martin Jan Nitzbon Johanna Scheer Kjetil Aas Trond Eiken Moritz Langer Simon Filhol Bernd Etzelmüller Sebastian Westermann |
author_sort |
Léo Martin |
title |
Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
title_short |
Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
title_full |
Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
title_fullStr |
Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
title_full_unstemmed |
Lateral thermokarst patterns in permafrost peat plateaus in northern Norway |
title_sort |
lateral thermokarst patterns in permafrost peat plateaus in northern norway |
publishDate |
2021 |
url |
https://zenodo.org/record/6593245 https://doi.org/10.5194/tc-15-3423-2021 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ice Northern Norway Peat Peat plateau permafrost Subarctic Thermokarst |
genre_facet |
Ice Northern Norway Peat Peat plateau permafrost Subarctic Thermokarst |
op_relation |
https://zenodo.org/communities/nunataryuk https://zenodo.org/record/6593245 https://doi.org/10.5194/tc-15-3423-2021 oai:zenodo.org:6593245 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5194/tc-15-3423-2021 |
container_title |
The Cryosphere |
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15 |
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7 |
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3423 |
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3442 |
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1766027813446483968 |