| Title | PSInSAR monitoring of ground movement at Salluit, Quebec (Canada), due to freeze-thaw cycles, active layer thickening, and permafrost warming |
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| Author | Fortier, R; LeBlanc, A -M ; Falorni, G; Therrien, R |
| Source | Proceedings of the 10th International Permafrost Conference; by Fortier, R (ed.); 2012 p. 113-118 |
| Image |  |
| Year | 2012 |
| Alt Series | Earth Sciences Sector, Contribution Series 20110263 |
| Meeting | International Permafrost Conference; Salekhard; RU; June 25-29, 2012 |
| Document | book |
| Lang. | English |
| Media | paper |
| Province | Quebec |
| NTS | 35J/04 |
| Area | Salluit |
| Lat/Long WENS | -76.0000 -75.5000 62.2500 62.0000 |
| Subjects | environmental geology; surficial geology/geomorphology; Nature and Environment; permafrost; ground ice; freezing ground; ground temperatures; radar methods; radar imagery; ice movement; climate, arctic;
climatic fluctuations; PSInSAR; ERS-1 satellite; ERS-2 satellite |
| Illustrations | location maps; plots; tables |
| Program | Climate Change Geoscience |
| Released | 2012 01 01 |
| Abstract | Radar images of Salluit in Northern Quebec, Canada, taken by the ERS-1 and ERS-2 satellites from 1992 to 2000 were analyzed using a permanent scatterer interferometric synthetic aperture radar (PSInSAR)
technique to monitor ground movement. Time series of PS targets on rock outcrops show that postglacial uplift generates ground motion toward the satellite at velocities of about 1 mm/year. Other PS targets on ice-poor saline permafrost indicate
ground motion away from the satellite at velocities in excess of 7 mm/year with superposed annual variations of 8 mm in amplitude. Numerical simulations of the impacts on the thermal regime of permafrost with an increase in air temperature of about
2°C, as observed in Northeastern Canada over the study period, suggest that the subsidence is due to the active layer thickening and permafrost warming while the annual variations are caused by the freeze-thaw cycles in the active layer. |
| GEOSCAN ID | 289546 |
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