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TitlePSInSAR monitoring of ground movement at Salluit, Quebec (Canada), due to freeze-thaw cycles, active layer thickening, and permafrost warming
AuthorFortier, R; LeBlanc, A -M; Falorni, G; Therrien, R
SourceProceedings of the 10th International Permafrost Conference; by Fortier, R (ed.); 2012 p. 113-118
Alt SeriesEarth Sciences Sector, Contribution Series 20110263
MeetingInternational Permafrost Conference; Salekhard; RU; June 25-29, 2012
Lat/Long WENS-76.0000 -75.5000 62.2500 62.0000
Subjectsenvironmental geology; surficial geology/geomorphology; permafrost; ground ice; freezing ground; ground temperatures; radar methods; radar imagery; ice movement; climate, arctic; climatic fluctuations; PSInSAR; ERS-1 satellite; ERS-2 satellite
Illustrationslocation maps; plots; tables
ProgramProgram Management - Climate Change Science, Climate Change Geoscience
AbstractRadar 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.