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TitreGround ice map of Canada v.1: national-scale mapping of relict, segregated, and wedge ice abundance in permafrost
AuteurO'Neill, H B; Wolfe, S A; Duchesne, C
SourceArctic Change 2020; 2020, 1 feuille
Année2020
Séries alt.Ressources naturelles Canada, Contribution externe 20200481
RéunionArctic Change 2020; Dec 7-10, 2020
Documentpublication en série
Lang.anglais
Cartes1 carte
Info. cartedépôts meubles
Mediaen ligne; numérique
Référence reliéeCette publication est reliée O'Neill, H B; Wolfe, S A; Duchesne, C; (2020). Ground ice map of Canada, Commission géologique du Canada, Dossier public 8713, éd. version 1
Formatspdf
ProvinceCanada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut
SNRC1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Sujetspergélisol; glace fossile; caractéristiques périglaciaires; changement climatique; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; Nature et environnement; Sciences et technologie
ProgrammeGéosciences de changements climatiques, Pergélisols
Diffusé2020 12 01
Résumé(disponible en anglais seulement)
We present and discuss new national-scale mapping of ground ice conditions in Canada, a product of Natural Resource Canada's Climate Change Geoscience Program. The mapping depicts a first-order estimate of the combined volumetric percentage of excess ice in the top 5 m of permafrost from segregated, wedge, and relict ice. The estimates for the three ice types are based on modelling by O’Neill et al. (2019) (https://doi.org/10.5194/tc-13-753-2019), and informed by published values of ground ice content and expert knowledge. The modelling employs existing national-scale datasets on surficial geology, paleovegetation, deglaciation, and permafrost distribution, coupled with an expert-system approach implemented in a geographic information system to calculate relative abundance of relict, segregated, and wedge ice. Volumetric excess ice content in the upper 5 m of the ground for each ice type is then estimated based on values reported in the literature, and raster algebra is used to produce a map of total ice content. The mapping offers an improved depiction of ground ice in Canada at a broad scale, incorporating current knowledge on the associations between geological and environmental conditions and ground ice type and abundance. It provides a foundation for hypothesis testing related to broad-scale controls on ground ice formation, preservation, and melt. Additional compilation of quantitative field data on ground ice, and improvements to national-scale surficial geology mapping will allow further assessment and refinement of the representation of ground ice in Canada. Continued research should focus on improving the lateral and vertical representation of ground ice for incorporation into Earth system models and decision-making. Spatial data files of the mapping are freely downloadable from GEOSCAN: https://doi.org/10.4095/326885.
GEOSCAN ID327310