Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island
Ice-wedge networks underlie polygonal terrain and comprise the most widespread form of massive ground ice in continuous permafrost. Here, we show that climate-driven thaw of hilltop ice-wedge networks is rapidly transforming uplands across Banks Island in the Canadian Arctic Archipelago. Change dete...
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ftdoajarticles:oai:doaj.org/article:97d5778d40f44e66bf4210ce192226ad 2023-05-15T14:28:56+02:00 Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island Robert H. Fraser Steven V. Kokelj Trevor C. Lantz Morgan McFarlane-Winchester Ian Olthof Denis Lacelle 2018-06-01T00:00:00Z https://doi.org/10.3390/rs10060954 https://doaj.org/article/97d5778d40f44e66bf4210ce192226ad EN eng MDPI AG http://www.mdpi.com/2072-4292/10/6/954 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs10060954 https://doaj.org/article/97d5778d40f44e66bf4210ce192226ad Remote Sensing, Vol 10, Iss 6, p 954 (2018) permafrost climate change ice-wedge polygons Landsat Banks Island Arctic terrain sensitivity Science Q article 2018 ftdoajarticles https://doi.org/10.3390/rs10060954 2022-12-31T11:23:33Z Ice-wedge networks underlie polygonal terrain and comprise the most widespread form of massive ground ice in continuous permafrost. Here, we show that climate-driven thaw of hilltop ice-wedge networks is rapidly transforming uplands across Banks Island in the Canadian Arctic Archipelago. Change detection using high-resolution WorldView images and historical air photos, coupled with 32-year Landsat reflectance trends, indicate broad-scale increases in ponding from ice-wedge thaw on hilltops, which has significantly affected at least 1500 km2 of Banks Island and over 3.5% of the total upland area. Trajectories of change associated with this upland ice-wedge thermokarst include increased micro-relief, development of high-centred polygons, and, in areas of poor drainage, ponding and potential initiation of thaw lakes. Millennia of cooling climate have favoured ice-wedge growth, and an absence of ecosystem disturbance combined with surface denudation by solifluction has produced high Arctic uplands and slopes underlain by ice-wedge networks truncated at the permafrost table. The thin veneer of thermally-conductive mineral soils strongly links Arctic upland active-layer responses to summer warming. For these reasons, widespread and intense ice-wedge thermokarst on Arctic hilltops and slopes contrast more muted responses to warming reported in low and subarctic environments. Increasing field evidence of thermokarst highlights the inherent climate sensitivity of the Arctic permafrost terrain and the need for integrated approaches to monitor change and investigate the cascade of environmental consequences. Article in Journal/Newspaper Arctic Archipelago Arctic Banks Island Canadian Arctic Archipelago Climate change Ice permafrost Subarctic Thermokarst wedge* Directory of Open Access Journals: DOAJ Articles Arctic Canadian Arctic Archipelago Remote Sensing 10 6 954 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
permafrost climate change ice-wedge polygons Landsat Banks Island Arctic terrain sensitivity Science Q |
spellingShingle |
permafrost climate change ice-wedge polygons Landsat Banks Island Arctic terrain sensitivity Science Q Robert H. Fraser Steven V. Kokelj Trevor C. Lantz Morgan McFarlane-Winchester Ian Olthof Denis Lacelle Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
topic_facet |
permafrost climate change ice-wedge polygons Landsat Banks Island Arctic terrain sensitivity Science Q |
description |
Ice-wedge networks underlie polygonal terrain and comprise the most widespread form of massive ground ice in continuous permafrost. Here, we show that climate-driven thaw of hilltop ice-wedge networks is rapidly transforming uplands across Banks Island in the Canadian Arctic Archipelago. Change detection using high-resolution WorldView images and historical air photos, coupled with 32-year Landsat reflectance trends, indicate broad-scale increases in ponding from ice-wedge thaw on hilltops, which has significantly affected at least 1500 km2 of Banks Island and over 3.5% of the total upland area. Trajectories of change associated with this upland ice-wedge thermokarst include increased micro-relief, development of high-centred polygons, and, in areas of poor drainage, ponding and potential initiation of thaw lakes. Millennia of cooling climate have favoured ice-wedge growth, and an absence of ecosystem disturbance combined with surface denudation by solifluction has produced high Arctic uplands and slopes underlain by ice-wedge networks truncated at the permafrost table. The thin veneer of thermally-conductive mineral soils strongly links Arctic upland active-layer responses to summer warming. For these reasons, widespread and intense ice-wedge thermokarst on Arctic hilltops and slopes contrast more muted responses to warming reported in low and subarctic environments. Increasing field evidence of thermokarst highlights the inherent climate sensitivity of the Arctic permafrost terrain and the need for integrated approaches to monitor change and investigate the cascade of environmental consequences. |
format |
Article in Journal/Newspaper |
author |
Robert H. Fraser Steven V. Kokelj Trevor C. Lantz Morgan McFarlane-Winchester Ian Olthof Denis Lacelle |
author_facet |
Robert H. Fraser Steven V. Kokelj Trevor C. Lantz Morgan McFarlane-Winchester Ian Olthof Denis Lacelle |
author_sort |
Robert H. Fraser |
title |
Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
title_short |
Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
title_full |
Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
title_fullStr |
Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
title_full_unstemmed |
Climate Sensitivity of High Arctic Permafrost Terrain Demonstrated by Widespread Ice-Wedge Thermokarst on Banks Island |
title_sort |
climate sensitivity of high arctic permafrost terrain demonstrated by widespread ice-wedge thermokarst on banks island |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/rs10060954 https://doaj.org/article/97d5778d40f44e66bf4210ce192226ad |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Banks Island Canadian Arctic Archipelago Climate change Ice permafrost Subarctic Thermokarst wedge* |
genre_facet |
Arctic Archipelago Arctic Banks Island Canadian Arctic Archipelago Climate change Ice permafrost Subarctic Thermokarst wedge* |
op_source |
Remote Sensing, Vol 10, Iss 6, p 954 (2018) |
op_relation |
http://www.mdpi.com/2072-4292/10/6/954 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs10060954 https://doaj.org/article/97d5778d40f44e66bf4210ce192226ad |
op_doi |
https://doi.org/10.3390/rs10060954 |
container_title |
Remote Sensing |
container_volume |
10 |
container_issue |
6 |
container_start_page |
954 |
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1766303051086299136 |