| Titre | PSInSAR monitoring of ground movement at Salluit, Quebec (Canada), due to freeze-thaw cycles, active layer thickening, and permafrost warming |
| Auteur | Fortier, R; LeBlanc, A -M; Falorni, G; Therrien, R |
| Source | Proceedings of the 10th International Permafrost Conference; par Fortier, R (éd.); 2012 p. 113-118 |
| Année | 2012 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110263 |
| Réunion | International Permafrost Conference; Salekhard; RU; juin 25-29, 2012 |
| Document | livre |
| Lang. | anglais |
| Media | papier |
| Province | Québec |
| SNRC | 35J/04 |
| Lat/Long OENS | -76.0000 -75.5000 62.2500 62.0000 |
| Sujets | pergélisol; glace fossile; congélation du sol; températures au sol; méthodes radar; imagerie radar; mouvement de la glace; climat arctique; fluctuations climatiques; géologie de l'environnement; géologie
des dépôts meubles/géomorphologie; Nature et environnement |
| Illustrations | location maps; plots; tables |
| Programme | Gestionaire de programme - sciences de changements climatiques, Géosciences de changements climatiques |
| Résumé | (disponible en anglais seulement)
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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