Segregated ice structures in various heaved permafrost landforms through CT Scan
Abstract The growth of segregated ice lenses in frost susceptible sediments in the discontinuous permafrost zone is the dominant mechanism for the formation of permafrost mounds, such as palsas, lithalsas and permafrost plateaus. Thawing of these mounds creates thermokarst lakes, which are particula...
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crwiley:10.1002/esp.1538 2024-06-02T08:07:53+00:00 Segregated ice structures in various heaved permafrost landforms through CT Scan Calmels, Fabrice Allard, Michel 2007 http://dx.doi.org/10.1002/esp.1538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1538 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 33, issue 2, page 209-225 ISSN 0197-9337 1096-9837 journal-article 2007 crwiley https://doi.org/10.1002/esp.1538 2024-05-03T11:06:18Z Abstract The growth of segregated ice lenses in frost susceptible sediments in the discontinuous permafrost zone is the dominant mechanism for the formation of permafrost mounds, such as palsas, lithalsas and permafrost plateaus. Thawing of these mounds creates thermokarst lakes, which are particularly abundant in Nunavik, east of the Hudson Bay area. The inception of the permafrost in mounds and their growth are regulated by climate conditions, by local Quaternary geology and by environmental factors such as topography, vegetation, snow cover and surface humidity. Variable sizes and morphology of the permafrost mounds can be attributed to local factors that affect the ice segregation process, particularly the supply of water needed for ice‐lens growth and grain‐size composition of the soil into which aggradation takes place. Computer image analysis of CT scans on high quality cores obtained from permafrost mounds and plateaus of various shapes reveal that the ice layer sequences and permafrost internal structure vary with landform types. A relationship therefore exists between different morphological type within a family of landforms and their microscale internal structure. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Hudson Bay Ice palsas permafrost Thermokarst Nunavik Wiley Online Library Hudson Hudson Bay Nunavik Earth Surface Processes and Landforms 33 2 209 225 |
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Abstract The growth of segregated ice lenses in frost susceptible sediments in the discontinuous permafrost zone is the dominant mechanism for the formation of permafrost mounds, such as palsas, lithalsas and permafrost plateaus. Thawing of these mounds creates thermokarst lakes, which are particularly abundant in Nunavik, east of the Hudson Bay area. The inception of the permafrost in mounds and their growth are regulated by climate conditions, by local Quaternary geology and by environmental factors such as topography, vegetation, snow cover and surface humidity. Variable sizes and morphology of the permafrost mounds can be attributed to local factors that affect the ice segregation process, particularly the supply of water needed for ice‐lens growth and grain‐size composition of the soil into which aggradation takes place. Computer image analysis of CT scans on high quality cores obtained from permafrost mounds and plateaus of various shapes reveal that the ice layer sequences and permafrost internal structure vary with landform types. A relationship therefore exists between different morphological type within a family of landforms and their microscale internal structure. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Calmels, Fabrice Allard, Michel |
spellingShingle |
Calmels, Fabrice Allard, Michel Segregated ice structures in various heaved permafrost landforms through CT Scan |
author_facet |
Calmels, Fabrice Allard, Michel |
author_sort |
Calmels, Fabrice |
title |
Segregated ice structures in various heaved permafrost landforms through CT Scan |
title_short |
Segregated ice structures in various heaved permafrost landforms through CT Scan |
title_full |
Segregated ice structures in various heaved permafrost landforms through CT Scan |
title_fullStr |
Segregated ice structures in various heaved permafrost landforms through CT Scan |
title_full_unstemmed |
Segregated ice structures in various heaved permafrost landforms through CT Scan |
title_sort |
segregated ice structures in various heaved permafrost landforms through ct scan |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/esp.1538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.1538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.1538 |
geographic |
Hudson Hudson Bay Nunavik |
geographic_facet |
Hudson Hudson Bay Nunavik |
genre |
Hudson Bay Ice palsas permafrost Thermokarst Nunavik |
genre_facet |
Hudson Bay Ice palsas permafrost Thermokarst Nunavik |
op_source |
Earth Surface Processes and Landforms volume 33, issue 2, page 209-225 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.1538 |
container_title |
Earth Surface Processes and Landforms |
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33 |
container_issue |
2 |
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209 |
op_container_end_page |
225 |
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