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TitleModelling ground ice in permafrost using a paleogeographic approach
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AuthorO'Neill, H B; Wolfe, S A; Duchesne, C
SourceGeological Survey of Canada, Scientific Presentation 95, 2019, 1 sheet, https://doi.org/10.4095/314593 (Open Access)
Image
Year2019
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf (Adobe® Reader®)
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 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
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectssurficial geology/geomorphology; environmental geology; permafrost; ground ice; modelling; paleogeography; glacial history; deglaciation; vegetation; sediments; climate; glaciers; geological mapping; permafrost degradation; relict ice; segregated ice; wedge ice; geographic data; geographic information systems
Illustrationsgeoscientific sketch maps
ProgramPermafrost, Climate Change Geoscience
Released2019 04 11
Summary(Plain Language Summary, not published)
New models depict ground ice in permafrost in Canada. The models use a new approach to calculate ground ice abundance in a geographic information system. Datasets of surficial geology, deglaciation, paleovegetation, glacial lake and marine limits, and modern permafrost distribution represent past environmental changes. Abundant massive ice is modelled in the western Arctic, preserved since deglaciation in continuous permafrost. Segregated ice is distributed in fine-grained soils, occurring in highest abundance in glacial lake and marine sediments. The modelled abundance of wedge ice reflects the exposure time of terrain to cold air temperatures following deglaciation, and is highest in the western Arctic. The model outputs reproduce observed regional ground ice conditions and are generally comparable with previous mapping. However, the new models are more detailed and better reflect observed ground ice conditions.
GEOSCAN ID314593