Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada
Abstract Ground surface and permafrost temperatures in the High Arctic are often considered homogeneous especially when viewed at the scale of climate and environmental models. However, this is generally incorrect due to highly variable, topographically redistributed snow cover, which generates a su...
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crwiley:10.1002/ppp.2086 2024-06-02T08:01:12+00:00 Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada Garibaldi, Madeleine C. Bonnaventure, Philip P. Lamoureux, Scott F. University of Lethbridge 2020 http://dx.doi.org/10.1002/ppp.2086 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2086 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2086 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 32, issue 1, page 19-34 ISSN 1045-6740 1099-1530 journal-article 2020 crwiley https://doi.org/10.1002/ppp.2086 2024-05-03T10:58:56Z Abstract Ground surface and permafrost temperatures in the High Arctic are often considered homogeneous especially when viewed at the scale of climate and environmental models. However, this is generally incorrect due to highly variable, topographically redistributed snow cover, which generates a substantial degree of ground thermal heterogeneity. The objective of this study is to describe and spatially model the variability in the ground thermal regime within the Cape Bounty Arctic Watershed Observatory (CBAWO), Nunavut, Canada, using the TTOP model, for current conditions in addition to a series of future climate change scenarios. While observed air temperature was mostly uniform, annual mean ground surface and permafrost temperatures across the paired watersheds were estimated to range between −3.8 to −13.8°C and −3.9 to −14°C, respectively, similar to the −5 to −15°C magnitude and range identified from boreholes across the High Arctic. The spatial models showed higher ground surface temperatures in topographic hollows (slope bases and stream channels), and lower temperatures in areas of topographic prominence (hilltops and plateaus) following the spatial pattern of snow accumulation and redistribution. Under projected climate change, the models predicted areas with the coldest permafrost to have the largest magnitude of warming (about 9°C), while areas of warm permafrost became closer to 0°C (warming 4–7°C). This thermal heterogeneity may have implications for ground instability such as permafrost‐related mass movements, hydrological connectivity, biogeochemical cycling, and microbial activity, which influence water quality and contaminant mobility. Article in Journal/Newspaper Arctic Climate change Nunavut permafrost Permafrost and Periglacial Processes Wiley Online Library Arctic Nunavut Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Permafrost and Periglacial Processes 32 1 19 34 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Ground surface and permafrost temperatures in the High Arctic are often considered homogeneous especially when viewed at the scale of climate and environmental models. However, this is generally incorrect due to highly variable, topographically redistributed snow cover, which generates a substantial degree of ground thermal heterogeneity. The objective of this study is to describe and spatially model the variability in the ground thermal regime within the Cape Bounty Arctic Watershed Observatory (CBAWO), Nunavut, Canada, using the TTOP model, for current conditions in addition to a series of future climate change scenarios. While observed air temperature was mostly uniform, annual mean ground surface and permafrost temperatures across the paired watersheds were estimated to range between −3.8 to −13.8°C and −3.9 to −14°C, respectively, similar to the −5 to −15°C magnitude and range identified from boreholes across the High Arctic. The spatial models showed higher ground surface temperatures in topographic hollows (slope bases and stream channels), and lower temperatures in areas of topographic prominence (hilltops and plateaus) following the spatial pattern of snow accumulation and redistribution. Under projected climate change, the models predicted areas with the coldest permafrost to have the largest magnitude of warming (about 9°C), while areas of warm permafrost became closer to 0°C (warming 4–7°C). This thermal heterogeneity may have implications for ground instability such as permafrost‐related mass movements, hydrological connectivity, biogeochemical cycling, and microbial activity, which influence water quality and contaminant mobility. |
author2 |
University of Lethbridge |
format |
Article in Journal/Newspaper |
author |
Garibaldi, Madeleine C. Bonnaventure, Philip P. Lamoureux, Scott F. |
spellingShingle |
Garibaldi, Madeleine C. Bonnaventure, Philip P. Lamoureux, Scott F. Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
author_facet |
Garibaldi, Madeleine C. Bonnaventure, Philip P. Lamoureux, Scott F. |
author_sort |
Garibaldi, Madeleine C. |
title |
Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
title_short |
Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
title_full |
Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
title_fullStr |
Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
title_full_unstemmed |
Utilizing the TTOP model to understand spatial permafrost temperature variability in a High Arctic landscape, Cape Bounty, Nunavut, Canada |
title_sort |
utilizing the ttop model to understand spatial permafrost temperature variability in a high arctic landscape, cape bounty, nunavut, canada |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ppp.2086 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2086 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2086 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) |
geographic |
Arctic Nunavut Canada Cape Bounty |
geographic_facet |
Arctic Nunavut Canada Cape Bounty |
genre |
Arctic Climate change Nunavut permafrost Permafrost and Periglacial Processes |
genre_facet |
Arctic Climate change Nunavut permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 32, issue 1, page 19-34 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.2086 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
32 |
container_issue |
1 |
container_start_page |
19 |
op_container_end_page |
34 |
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1800745512712798208 |