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TitlePermafrost degradation, subarctic Canadian Shield
AuthorMorse, P D; Wolfe, S A; McWade, T L; Kokelj, S
SourceBook of abstracts, 5th European Conference on Permafrost; by Deline, P (ed.); Bodin, X (ed.); Ravanel, L (ed.); 2018 p. 587-588 (Open Access)
LinksOnline - En ligne (complete volume - volume complet, pdf, 148.55 MB)
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180066
PublisherInternational Permafrost Association (Chamonix, France)
MeetingEUCOP 2018: 5th European Conference on Permafrost; Chamonix-Mont Blanc; FR; June 23 - July 1, 2018
Documentbook
Lang.English
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
ProvinceNorthwest Territories
NTS85J/06; 85J/07; 85J/08; 85J/09; 85J/10; 85J/11; 85J/14; 85J/15; 85J/16
AreaTlicho Region; North Slave Region; Great Slave Lake
Lat/Long WENS-115.3333 -114.3333 62.9333 62.3833
Subjectsenvironmental geology; surficial geology/geomorphology; geophysics; permafrost; ground ice; climate; ground temperatures; periglacial features; thermokarst; vegetation; remote sensing; photogrammetric techniques; airphoto interpretation; satellite imagery; Canadian Shield; Great Slave Lowland; Great Slave Upland; permafrost degradation; climate change; lithalsas; thermal degradation; forests; geological mapping
Illustrationslocation maps; geoscientific sketch maps; aerial photographs; satellite images; profiles; time series
ProgramPermafrost, Climate Change Geoscience
Released2019 02 04
AbstractRecent ground temperature and observational data for lithalsas (permafrost mounds of ice-rich, fine-grained sediments) are examined in the context of an inventory of thermokarst ponding between 1945 and 2005, subarctic Canadian Shield. Results show that many lithalsas are thermally and physically degrading, and widespread thermokarst primarily relates to lithalsa distribution. Future thermokarst development in this region of extensive discontinuous permafrost will continue to be associated with lithalsas that generally lack a protective surface organic layer.
Summary(Plain Language Summary, not published)
Recent ground temperature and observational data for lithalsas (permafrost mounds of ice-rich, fine-grained sediments) are examined in the context of an inventory of thermokarst (ground settlement when ice-rich permafrost thaws) ponding between 1945 and 2005, subarctic Canadian Shield. Results show that many lithalsas are thermally and physically degrading, and widespread thermokarst primarily relates to lithalsa distribution. Future thermokarst development in this region of extensive discontinuous permafrost will continue to be associated with lithalsas that generally lack a protective surface organic layer.
GEOSCAN ID308270