Permafrost in Nunavik

Permafrost in Nunavik Permafrost corresponds to any soil or rock whose temperature has remained below 0°C for years. In the extreme north of Quebec, it is omnipresent and very thick. At its northern margin, further south, it appears in the landscape as isolated thin plates, generally less than 10 m thick. Permafrost contains ice in various forms, the origin of which is closely linked to the sedimentary characteristics and drainage conditions of the terrain. The mapping of permafrost conditions for Nunavik (territory located north of the 55th parallel), carried out by the Centre d'études nordique of Université Laval, was done by applying a simple model called TTOP (Temperature at the Top Of Permafrost) for the period from 2000 to 2016. The model results are presented in the form of a raster file that illustrates the distribution of continuous, discontinuous, and sporadic permafrost, as well as isolated islands. Under the effect of global warming or ill-adapted anthropogenic activities, permafrost heats up, or even thaws, leading to settlements and ground movements affecting ecosystems as well as infrastructure. Thus, the susceptibility of the territory to thermokarst subsidence was evaluated for the same territory taking into account the ice content and the temperature at the top of the permafrost. A raster file of the territory's susceptibility to permafrost thawing ground subsidence shows three susceptibility classes (high, moderate, and low) as well as areas that are generally permafrost-free.**This third party metadata element was translated using an automated translation tool (Amazon Translate).** 2022-09-27 Government and Municipalities of Québec services.clientele@mffp.gouv.qc.ca Form DescriptorsNature and EnvironmentScience and Technology Permafrost distributionGeoTIF https://diffusion.mffp.gouv.qc.ca/Diffusion/DonneeGratuite/Foret/DONNEES_FOR_ECO_NORD/Pergelisol/DistributionPergelisol.zip Susceptibility to soil subsidence associated with thawing permafrostGeoTIF https://diffusion.mffp.gouv.qc.ca/Diffusion/DonneeGratuite/Foret/DONNEES_FOR_ECO_NORD/Pergelisol/SusceptibiliteAffaissementsDegelPergelisol.zip Open forestHTML https://www.foretouverte.gouv.qc.ca/?context=_carte_nord&zoom=6¢er=-72.14338,59.03086&invisiblelayers=*&visiblelayers=0fbef13a12f65237072417fa0236cc94,1da64ddfeaf23710b8a9ad95133fb5d8 Open forestHTML https://www.foretouverte.gouv.qc.ca/?context=_telechargement&zoom=6¢er=-72.11261,57.91184&invisiblelayers=*&visiblelayers=634387214b14c87b4f78d72d2717829f,1da64ddfeaf23710b8a9ad95133fb5d8 Original metadata (https://www.donneesquebec.ca)HTML https://www.donneesquebec.ca/recherche/fr/dataset/ac5d0559-d47c-432b-905a-d69d9d71b2a5 READ MEPDF https://diffusion.mffp.gouv.qc.ca/Diffusion/DonneeGratuite/Foret/DONNEES_FOR_ECO_NORD/Pergelisol/1-Documentation/LISEZ-MOI_pergelisol.PDF Map of permafrost in Northern QuebecPDF https://mffp.gouv.qc.ca/wp-content/uploads/Carte_24x36_pergelisol_francais.pdf Susceptibility to soil subsidence associated with thawing permafrostPDF https://mffp.gouv.qc.ca/wp-content/uploads/Carte_24x36_affaissements.pdf Production of the 2nd approximation of the Quebec permafrost map as a function of geomorphological and ecological parameters and physical processes related to climatePDF https://mffp.gouv.qc.ca/documents/forets/inventaire/Production_2e_appro_pergelisol.pdf Identification and analysis of Nunavik's vulnerabilities based on environmental components and natural physical processes related to climate: Phase 1PDF https://mffp.gouv.qc.ca/documents/forets/inventaire/CEN-MFFP_Rapport.pdf Descriptive sheet of attributes and their domains of valueXLS https://diffusion.mffp.gouv.qc.ca/Diffusion/DonneeGratuite/Foret/DONNEES_FOR_ECO_NORD/Pergelisol/1-Documentation/DICTIONNAIRE_CARTE_PERG_SUSCEPT_AFF.xlsx

Permafrost corresponds to any soil or rock whose temperature has remained below 0°C for years. In the extreme north of Quebec, it is omnipresent and very thick. At its northern margin, further south, it appears in the landscape as isolated thin plates, generally less than 10 m thick. Permafrost contains ice in various forms, the origin of which is closely linked to the sedimentary characteristics and drainage conditions of the terrain. The mapping of permafrost conditions for Nunavik (territory located north of the 55th parallel), carried out by the Centre d'études nordique of Université Laval, was done by applying a simple model called TTOP (Temperature at the Top Of Permafrost) for the period from 2000 to 2016. The model results are presented in the form of a raster file that illustrates the distribution of continuous, discontinuous, and sporadic permafrost, as well as isolated islands. Under the effect of global warming or ill-adapted anthropogenic activities, permafrost heats up, or even thaws, leading to settlements and ground movements affecting ecosystems as well as infrastructure. Thus, the susceptibility of the territory to thermokarst subsidence was evaluated for the same territory taking into account the ice content and the temperature at the top of the permafrost. A raster file of the territory's susceptibility to permafrost thawing ground subsidence shows three susceptibility classes (high, moderate, and low) as well as areas that are generally permafrost-free.This third party metadata element was translated using an automated translation tool (Amazon Translate).

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