| Title | Permafrost degradation, subarctic Canadian Shield |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Morse, P D ;
Wolfe, S A; McWade, T L; Kokelj, S V |
| Source | Geological Survey of Canada, Scientific Presentation 101, 2019, 1 sheet, https://doi.org/10.4095/314643  Open Access |
| Image |  |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf (Adobe® Reader®) |
| Province | Northwest Territories |
| NTS | 85J/06; 85J/07; 85J/09; 85J/10; 85J/11; 85J/14; 85J/15; 85J/16 |
| Area | Great Slave Lake; Yellowknife |
| Lat/Long WENS | -115.3333 -114.3667 62.9500 62.3833 |
| Subjects | surficial geology/geomorphology; environmental geology; permafrost; ground ice; periglacial features; ice lenses; thermokarst; ground temperatures; subsidence; climate effects; organic deposits;
Canadian Shield; lithalsas; Climate change; lacustrine sediments; glaciolacustrine sediments; glaciofluvial sediments |
| Illustrations | location maps; time series; photographs; aerial photographs; satellite images; profiles; geoscientific sketch maps |
| Program | Climate Change
Geoscience Permafrost |
| Released | 2019 05 08 |
| Abstract | Recent ground temperature and observational data for lithalsas in the subarctic Canadian Shield (permafrost mounds of ice-rich, fine-grained sediments) are examined in the context of an inventory of
thermokarst ponding between 1945 and 2005. 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 often lack a protective surface organic layer. |
| Summary | (Plain Language Summary, not published)
Recent ground temperature and observational data for lithalsas in the subarctic Canadian Shield (permafrost mounds of ice-rich, fine-grained sediments)
are examined in the context of an inventory of thermokarst ponding (subsidence of the ground due to thaw of ice-rich permafrost and water ponding) between 1945 and 2005. 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 often lack a protective surface organic
layer. |
| GEOSCAN ID | 314643 |
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