Fine‐scale environment control on ground surface temperature and thaw depth in a High Arctic tundra landscape
Abstract 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 analyz...
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crwiley:10.1002/ppp.2203 2024-10-06T13:46:10+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 Natural Sciences and Engineering Research Council of Canada Canada Excellence Research Chairs, Government of Canada 2023 http://dx.doi.org/10.1002/ppp.2203 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2203 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Permafrost and Periglacial Processes volume 34, issue 4, page 467-480 ISSN 1045-6740 1099-1530 journal-article 2023 crwiley https://doi.org/10.1002/ppp.2203 2024-09-11T04:15:44Z Abstract 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°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 Arctic Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra Wiley Online Library Arctic Bylot Island Canada Nunavut Permafrost and Periglacial Processes 34 4 467 480 |
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Wiley Online Library |
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English |
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Abstract 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°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 |
Natural Sciences and Engineering Research Council of Canada Canada Excellence Research Chairs, Government of Canada |
format |
Article in Journal/Newspaper |
author |
Khani, Hadi Mohammadzadeh Kinnard, Christophe Gascoin, Simon Lévesque, Esther |
spellingShingle |
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 |
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 |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/ppp.2203 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2203 |
geographic |
Arctic Bylot Island Canada Nunavut |
geographic_facet |
Arctic Bylot Island Canada Nunavut |
genre |
Arctic Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra |
genre_facet |
Arctic Bylot Island Nunavut permafrost Permafrost and Periglacial Processes Tundra |
op_source |
Permafrost and Periglacial Processes volume 34, issue 4, page 467-480 ISSN 1045-6740 1099-1530 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/ppp.2203 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
34 |
container_issue |
4 |
container_start_page |
467 |
op_container_end_page |
480 |
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1812174495968919552 |