Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape
International audience Surface conditions are known to mediate the impacts of climate warming on permafrost. This calls for a better understanding of the environmental conditions that control the thermal regime and the depth of the active layer, especially within heterogeneous tundra landscapes. Thi...
Published in: | Permafrost and Periglacial Processes |
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Main Authors: | , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Online Access: | https://hal.science/hal-04171883 https://hal.science/hal-04171883/document https://hal.science/hal-04171883/file/Permafrost%20Periglacial%20-%202023%20-%20Khani.pdf https://doi.org/10.1002/ppp.2203 |
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ftutoulouse3hal:oai:HAL:hal-04171883v1 |
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openpolar |
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Open Polar |
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Université Toulouse III - Paul Sabatier: HAL-UPS |
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ftutoulouse3hal |
language |
English |
topic |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
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[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Khani, Hadi Mohammadzadeh Kinnard, Christophe Gascoin, Simon Lévesque, Esther Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
topic_facet |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience Surface conditions are known to mediate the impacts of climate warming on permafrost. This calls for a better understanding of the environmental conditions that control the thermal regime and the depth of the active layer, especially within heterogeneous tundra landscapes. This study analyzed the spatial relationships between thaw depths, ground surface temperature (GST), and environmental conditions in a High Arctic tundra environment at Bylot Island, Nunavut, Canada. Measurements were distributed within the two dominant landforms, namely earth hummocks and low-center polygons, and across a topographic gradient. Our results revealed that GST and thaw depth were highly heterogeneous, varying by up to 3.7 & DEG;C and by more than 20 cm over short distances (<1 m) within periglacial landforms. This microscale variability sometimes surpassed the variability at the hillslope scale, especially in summer. Late-winter snowpack thickness was found to be the prime control on the spatial variability in winter soil temperatures due to the highly heterogeneous snow cover induced by blowing snow, and this thermal effect carried over into summer. However, microtopography was the predominant driver of the spatial variability in summer GST, followed by altitude and moss thickness. In contrast, the spatial variability in thaw depth was influenced predominantly by variations in moss thickness. Hence, summer microclimate conditions dominated active layer development, but a thicker snowpack favored soil cooling in the following summer, due to the later disappearance of snow cover. These results enhance our understanding of High Arctic tundra environments and highlight the complexity of considering surface feedback effects in future projections of permafrost states within heterogeneous tundra landscapes. |
author2 |
Centre d'études spatiales de la biosphère (CESBIO) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Khani, Hadi Mohammadzadeh Kinnard, Christophe Gascoin, Simon Lévesque, Esther |
author_facet |
Khani, Hadi Mohammadzadeh Kinnard, Christophe Gascoin, Simon Lévesque, Esther |
author_sort |
Khani, Hadi Mohammadzadeh |
title |
Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
title_short |
Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
title_full |
Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
title_fullStr |
Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
title_full_unstemmed |
Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape |
title_sort |
fine‐scale environment control on ground surface temperature and thaw depth in a high arctic tundra landscape |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04171883 https://hal.science/hal-04171883/document https://hal.science/hal-04171883/file/Permafrost%20Periglacial%20-%202023%20-%20Khani.pdf https://doi.org/10.1002/ppp.2203 |
genre |
Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra |
genre_facet |
Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra |
op_source |
ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-04171883 Permafrost and Periglacial Processes, 2023, 34 (4), pp.467-480. ⟨10.1002/ppp.2203⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.2203 hal-04171883 https://hal.science/hal-04171883 https://hal.science/hal-04171883/document https://hal.science/hal-04171883/file/Permafrost%20Periglacial%20-%202023%20-%20Khani.pdf doi:10.1002/ppp.2203 WOS: 001033715700001 |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/ppp.2203 |
container_title |
Permafrost and Periglacial Processes |
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1810437756053094400 |
spelling |
ftutoulouse3hal:oai:HAL:hal-04171883v1 2024-09-15T18:00:35+00:00 Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape Khani, Hadi Mohammadzadeh Kinnard, Christophe Gascoin, Simon Lévesque, Esther Centre d'études spatiales de la biosphère (CESBIO) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2023-07-22 https://hal.science/hal-04171883 https://hal.science/hal-04171883/document https://hal.science/hal-04171883/file/Permafrost%20Periglacial%20-%202023%20-%20Khani.pdf https://doi.org/10.1002/ppp.2203 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.2203 hal-04171883 https://hal.science/hal-04171883 https://hal.science/hal-04171883/document https://hal.science/hal-04171883/file/Permafrost%20Periglacial%20-%202023%20-%20Khani.pdf doi:10.1002/ppp.2203 WOS: 001033715700001 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-04171883 Permafrost and Periglacial Processes, 2023, 34 (4), pp.467-480. ⟨10.1002/ppp.2203⟩ [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/article Journal articles 2023 ftutoulouse3hal https://doi.org/10.1002/ppp.2203 2024-06-25T00:05:42Z International audience Surface conditions are known to mediate the impacts of climate warming on permafrost. This calls for a better understanding of the environmental conditions that control the thermal regime and the depth of the active layer, especially within heterogeneous tundra landscapes. This study analyzed the spatial relationships between thaw depths, ground surface temperature (GST), and environmental conditions in a High Arctic tundra environment at Bylot Island, Nunavut, Canada. Measurements were distributed within the two dominant landforms, namely earth hummocks and low-center polygons, and across a topographic gradient. Our results revealed that GST and thaw depth were highly heterogeneous, varying by up to 3.7 & DEG;C and by more than 20 cm over short distances (<1 m) within periglacial landforms. This microscale variability sometimes surpassed the variability at the hillslope scale, especially in summer. Late-winter snowpack thickness was found to be the prime control on the spatial variability in winter soil temperatures due to the highly heterogeneous snow cover induced by blowing snow, and this thermal effect carried over into summer. However, microtopography was the predominant driver of the spatial variability in summer GST, followed by altitude and moss thickness. In contrast, the spatial variability in thaw depth was influenced predominantly by variations in moss thickness. Hence, summer microclimate conditions dominated active layer development, but a thicker snowpack favored soil cooling in the following summer, due to the later disappearance of snow cover. These results enhance our understanding of High Arctic tundra environments and highlight the complexity of considering surface feedback effects in future projections of permafrost states within heterogeneous tundra landscapes. Article in Journal/Newspaper Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra Université Toulouse III - Paul Sabatier: HAL-UPS Permafrost and Periglacial Processes |