Stability Conditions of Peat Plateaus and Palsas in Northern Norway
International audience Peat plateaus and palsas are characteristic morphologies of sporadic permafrost, and the transition from permafrost to permafrost-free ground typically occurs on spatial scales of meters. They are particularly vulnerable to climate change and are currently degrading in Fennosc...
Published in: | Journal of Geophysical Research: Earth Surface |
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Online Access: | https://hal.science/hal-03967482 https://hal.science/hal-03967482/document https://hal.science/hal-03967482/file/JGR%20Earth%20Surface%20-%202019%20-%20Martin%20-%20Stability%20Conditions%20of%20Peat%20Plateaus%20and%20Palsas%20in%20Northern%20Norway.pdf https://doi.org/10.1029/2018JF004945 |
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ftunivnantes:oai:HAL:hal-03967482v1 2023-05-15T16:12:04+02:00 Stability Conditions of Peat Plateaus and Palsas in Northern Norway Martin, Léo C.P. Nitzbon, J. Aas, K, Etzelmüller, B. Kristiansen, H. Westermann, S. University of Oslo (UiO) Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Partenaires INRAE Humboldt University Of Berlin Department of Geosciences Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) 2019-03-19 https://hal.science/hal-03967482 https://hal.science/hal-03967482/document https://hal.science/hal-03967482/file/JGR%20Earth%20Surface%20-%202019%20-%20Martin%20-%20Stability%20Conditions%20of%20Peat%20Plateaus%20and%20Palsas%20in%20Northern%20Norway.pdf https://doi.org/10.1029/2018JF004945 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JF004945 hal-03967482 https://hal.science/hal-03967482 https://hal.science/hal-03967482/document https://hal.science/hal-03967482/file/JGR%20Earth%20Surface%20-%202019%20-%20Martin%20-%20Stability%20Conditions%20of%20Peat%20Plateaus%20and%20Palsas%20in%20Northern%20Norway.pdf doi:10.1029/2018JF004945 info:eu-repo/semantics/OpenAccess ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03967482 Journal of Geophysical Research: Earth Surface, 2019, 124 (3), pp.705-719. ⟨10.1029/2018JF004945⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1029/2018JF004945 2023-03-01T01:02:27Z International audience Peat plateaus and palsas are characteristic morphologies of sporadic permafrost, and the transition from permafrost to permafrost-free ground typically occurs on spatial scales of meters. They are particularly vulnerable to climate change and are currently degrading in Fennoscandia. Here we present a spatially distributed data set of ground surface temperatures for two peat plateau sites in northern Norway for the year 2015–2016. Based on these data and thermal modeling, we investigate how the snow depth and water balance modulate the climate signal in the ground. We find that mean annual ground surface temperatures are centered around 2 to 2.5 °C for stable permafrost locations and 3.5 to 4.5 °C for permafrost-free locations. The surface freezing degree days are characterized by a noticeable threshold around 200 °C.day, with most permafrost-free locations ranging below this value and most stable permafrost ones above it. Freezing degree day values are well correlated to the March snow cover, although some variability is observed and attributed to the ground moisture level. Indeed, a zero curtain effect is observed on temperature time series for saturated soils during winter, while drained peat plateaus show early freezing surface temperatures. Complementarily, modeling experiments allow identifying a drainage effect that can modify 1-m ground temperatures by up to 2 °C between drained and water accumulating simulations for the same snow cover. This effect can set favorable or unfavorable conditions for permafrost stability under the same climate forcing. Article in Journal/Newspaper Fennoscandia Northern Norway palsas Peat Peat plateau permafrost Université de Nantes: HAL-UNIV-NANTES Norway Journal of Geophysical Research: Earth Surface 124 3 705 719 |
institution |
Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Martin, Léo C.P. Nitzbon, J. Aas, K, Etzelmüller, B. Kristiansen, H. Westermann, S. Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Peat plateaus and palsas are characteristic morphologies of sporadic permafrost, and the transition from permafrost to permafrost-free ground typically occurs on spatial scales of meters. They are particularly vulnerable to climate change and are currently degrading in Fennoscandia. Here we present a spatially distributed data set of ground surface temperatures for two peat plateau sites in northern Norway for the year 2015–2016. Based on these data and thermal modeling, we investigate how the snow depth and water balance modulate the climate signal in the ground. We find that mean annual ground surface temperatures are centered around 2 to 2.5 °C for stable permafrost locations and 3.5 to 4.5 °C for permafrost-free locations. The surface freezing degree days are characterized by a noticeable threshold around 200 °C.day, with most permafrost-free locations ranging below this value and most stable permafrost ones above it. Freezing degree day values are well correlated to the March snow cover, although some variability is observed and attributed to the ground moisture level. Indeed, a zero curtain effect is observed on temperature time series for saturated soils during winter, while drained peat plateaus show early freezing surface temperatures. Complementarily, modeling experiments allow identifying a drainage effect that can modify 1-m ground temperatures by up to 2 °C between drained and water accumulating simulations for the same snow cover. This effect can set favorable or unfavorable conditions for permafrost stability under the same climate forcing. |
author2 |
University of Oslo (UiO) Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Partenaires INRAE Humboldt University Of Berlin Department of Geosciences Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) |
format |
Article in Journal/Newspaper |
author |
Martin, Léo C.P. Nitzbon, J. Aas, K, Etzelmüller, B. Kristiansen, H. Westermann, S. |
author_facet |
Martin, Léo C.P. Nitzbon, J. Aas, K, Etzelmüller, B. Kristiansen, H. Westermann, S. |
author_sort |
Martin, Léo C.P. |
title |
Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
title_short |
Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
title_full |
Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
title_fullStr |
Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
title_full_unstemmed |
Stability Conditions of Peat Plateaus and Palsas in Northern Norway |
title_sort |
stability conditions of peat plateaus and palsas in northern norway |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-03967482 https://hal.science/hal-03967482/document https://hal.science/hal-03967482/file/JGR%20Earth%20Surface%20-%202019%20-%20Martin%20-%20Stability%20Conditions%20of%20Peat%20Plateaus%20and%20Palsas%20in%20Northern%20Norway.pdf https://doi.org/10.1029/2018JF004945 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Fennoscandia Northern Norway palsas Peat Peat plateau permafrost |
genre_facet |
Fennoscandia Northern Norway palsas Peat Peat plateau permafrost |
op_source |
ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03967482 Journal of Geophysical Research: Earth Surface, 2019, 124 (3), pp.705-719. ⟨10.1029/2018JF004945⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JF004945 hal-03967482 https://hal.science/hal-03967482 https://hal.science/hal-03967482/document https://hal.science/hal-03967482/file/JGR%20Earth%20Surface%20-%202019%20-%20Martin%20-%20Stability%20Conditions%20of%20Peat%20Plateaus%20and%20Palsas%20in%20Northern%20Norway.pdf doi:10.1029/2018JF004945 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018JF004945 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
124 |
container_issue |
3 |
container_start_page |
705 |
op_container_end_page |
719 |
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1765997295212429312 |