| Title | Circumpolar-Active-Layer-Monitoring (CALM) sites in the Mackenzie Valley, Northwestern Canada |
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| Author | Tarnocai, C; Nixon, F M; Kutny, L |
| Source | Permafrost and Periglacial Processes vol. 15, no. 2, 2004 p. 141-153, https://doi.org/10.1002/ppp.490 |
| Image |  |
| Year | 2004 |
| Alt Series | Geological Survey of Canada, Contribution Series 2001093 |
| Publisher | Wiley-Blackwell |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Northwest Territories; Yukon |
| NTS | 85C; 85D; 85E; 85F; 85K; 85L; 85M; 85N; 86C; 86D; 86E; 86F; 86L; 95; 96; 97A/02; 97A/03; 97A/04; 97A/05; 97A/06; 97A/07; 97A/11; 97A/12; 97A/13; 97A/14; 97B; 97C; 105I; 105J/09; 105J/15; 105J/16; 105N/08;
105N/09; 105N/10; 105N/13; 105N/14; 105N/15; 105N/16; 105O; 105P; 106; 107A; 107B; 107C; 107D; 116H/01; 116H/02; 116H/07; 116H/08; 116H/09; 116H/10; 116H/15; 116H/16; 116I/01; 116I/02; 116I/07; 116I/08; 116I/09; 116I/10; 116I/15; 116I/16; 116P/01;
116P/02; 116P/07; 116P/08; 116P/09; 116P/10; 116P/15; 116P/16; 117A/01; 117A/08; 117A/09; 117A/16; 117D/01; 117D/08; 117D/09; 117D/16 |
| Area | Mackenzie Valley; Mackenzie River Delta; Taglu Island; North Head; Lousy Point; Parsons Lake; Reindeer Depot; Rengleng River; Mountain River; Norman Wells; Tulita; Ochre River; Willowlake River; Fort
Simpson |
| Lat/Long WENS | -137.0000 -116.0000 70.0000 60.0000 |
| Subjects | environmental geology; permafrost; climate effects; climate; soils; vegetation; climate, arctic; arctic geology; snow; ground temperatures |
| Illustrations | location maps; sketch maps; tables; drawings; photographs; plots; digital maps |
| Program | CALM - Circumpolar Active Layer Monitoring Program |
| Released | 2004 06 21 |
| Abstract | Active-layer studies have been maintained for more than a decade throughout the 1200?km length of the Mackenzie Valley. An important goal of these programmes is to monitor processes linking climate,
permafrost and the active layer. Thirteen sites have been selected from these studies for the Circumpolar Active Layer Monitoring programme of the International Permafrost Association. Annual maximum thaw penetration and ground surface movements are
measured relative to thaw tubes and soil temperature probes anchored in the permafrost. Active layer thickness, calculated from thaw penetration and surface movement or measured directly, varies more with local soil properties, vegetation and
microclimate than with regional atmospheric climate. While depth of thaw penetration has increased at most sites for much of the record, this increase is not always reflected by a proportional increase in active layer thickness because of variable
thaw settlement. Air thawing degree-days (DDT) in the Subarctic and Boreal regions are more than double those in the Arctic regions. These increases in DDT are not reflected in active-layer depths, suggesting the insulating effect of the surface
organic layer, vegetation and snow cover on active-layer development. |
| GEOSCAN ID | 212823 |
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