| Title | Long-term active layer monitoring: Mackenzie Valley, northwest Canada |
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| Author | Nixon, M; Tarnocai, C; Kutny, L |
| Source | Proceedings of the Eighth International Conference on Permafrost; by Phillips, M (ed.); Springman, S M (ed.); Arenson, L U (ed.); vol. 1, 2003 p. 821-826 |
| Links | 8th International Conference on Permafrost
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| Year | 2003 |
| Alt Series | Geological Survey of Canada, Contribution Series 2002036 |
| Publisher | A.A. Balkema Publishers (Lisse, NL) |
| Meeting | Eighth International Conference on Permafrost; Zurich; CH; July 21-25, 2003 |
| Document | book |
| Lang. | English |
| Media | paper |
| Province | Northwest Territories; Alberta |
| NTS | 84J/03; 84J/04; 84J/05; 84J/06; 84J/11; 84J/12; 84J/13; 84J/14; 84K; 84L; 84M; 84N; 84O/03; 84O/04; 84O/05; 84O/06; 84O/11; 84O/12; 84O/13; 84O/14; 85B/03; 85B/04; 85B/05; 85B/06; 85B/11; 85B/12; 85B/13;
85B/14; 85C; 85D; 85E; 85F; 85K/02; 85K/03; 85K/04; 85K/05; 85K/06; 85K/11; 85K/12; 85K/13; 85L; 85M/01; 85M/02; 85M/03; 85M/04; 85M/05; 85M/06; 85M/07; 85M/11; 85M/12; 85M/13; 95A; 95B; 95E; 95F; 95G; 95H; 95I; 95J; 95K; 95M; 95N; 95O; 95P; 96A;
96B; 96C; 96D; 96E; 96F; 96G; 96K; 96L; 96M/01; 96M/02; 96M/03; 96M/04; 96M/05; 96M/06; 96M/07; 96M/12; 106A; 106G/01; 106G/07; 106G/08; 106G/09; 106G/10; 106G/14; 106G/15; 106G/16; 106H; 106I; 106J; 106K/08; 106K/09; 106K/10; 106K/14; 106K/15;
106K/16; 106M; 106N; 106O; 106P; 107A/02; 107A/03; 107A/04; 107A/05; 107A/06; 107A/11; 107A/12; 107A/13; 107B; 107C/01; 107C/02; 107C/03; 107C/04; 107C/05; 107C/06; 107C/07; 107C/08; 107C/10; 107C/11; 107C/12; 107C/13; 107C/14; 116P/01; 116P/08;
116P/09; 116P/16; 117A/01; 117A/08; 117A/09; 117A/16; 117D/01; 117D/08; 117D/09; 117D/16 |
| Area | Mackenzie Valley; Mackenzie River Delta; Tuktoyaktuk; Inuvik; Norman Wells; Fort Simpson; Liard River |
| Lat/Long WENS | -136.5000 -115.0000 70.0000 58.0000 |
| Subjects | environmental geology; arctic geology; climate, arctic; climate; climate effects; permafrost; soils; vegetation; snow |
| Illustrations | sketch maps; tables; bar graphs |
| Abstract | Active layer study programs have been maintained for more than a decade throughout the 1400km length of the Mackenzie Valley. An important goal of these programs is to monitor processes linking
climate,permafrost and the active layer. Seventeen representative sites from this area were selected for this study. Annual maximum thaw penetration and ground surface movement are measured relative to thaw tubes and soil temperature probes anchored
in 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 over the last 10–15 years, 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 are more than twice those in the Arctic. These increases in DDT are not reflected by active layer depths, suggesting the insulating effect of the surface organic layer, vegetation and snow cover on active layer development. |
| GEOSCAN ID | 213465 |
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