| Title | Changes in soil temperature and active layer thickness during the twentieth century in a region in western Canada |
| Download | Downloads (Preprint) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Chen, W ; Zhang,
Y; Cihlar, J; Smith, S L; Riseborough, D W |
| Source | Journal of Geophysical Research vol. 108, no. 22, 4696, 2003 p. ACL 6 1-ACL 6 13, https://doi.org/10.1029/2002JD003355  Open Access |
| Links | Abstract - Résumé
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| Year | 2003 |
| Alt Series | Earth Sciences Sector, Contribution Series 20043167 |
| Alt Series | Geological Survey of Canada, Contribution Series 2002226 |
| Publisher | Wiley-Blackwell |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | Economics and Industry; Nature and Environment |
| Program | Program of Energy Research and Development (PERD) |
| Program | Climate Change Action Fund (CCAF) |
| Released | 2003 11 21 |
| Abstract | Increases in active-layer thickness and permafrost degradation induced by climate warming may have profound socio-economic and eco-environmental consequences. Using a process-based model of Northern
Ecosystem Soil Temperature (NEST) and data from climate records, remote sensing vegetation parameters, and soil features, we simulated soil temperature and active-layer thickness (ALT) for a region in western Canada during the twentieth century. The
results showed that the region-averaged annual mean soil temperatures at different depths responded to air temperature forcing consistently during the twentieth century, but with reduced magnitudes in both long-term trend and interannual variation.
From the 1900s to 1986-1995, ALT increased 124 cm (or 79%) in the isolated and sporadic discontinuous permafrost zones, 59 cm (or 37%) in the extensive discontinuous permafrost zone, and 20 cm (or 21%) in the continuous permafrost zone based on the
current permafrost distribution map. The simulated results also indicated the disappearance of 17% of the permafrost in the discontinuous permafrost zone from the 1900s to 1940s, and another 22% from the 1940s to 1986-1995. General agreements were
found when comparing the simulated results with soil temperature records at climate stations, ALT at survey sites, and rates of permafrost degradation interpreted from aerial photographs. Owing to differences in spatial scales, spatial coverage, and
time periods, many of the comparisons were not strict 1-to-1 comparisons and should instead be viewed as indirect supporting evidence. |
| GEOSCAN ID | 219969 |
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