Seasonal Surface Subsidence and Frost Heave Detected by C-Band DInSAR in a High Arctic Environment, Cape Bounty, Melville Island, Nunavut, Canada

Differential interferometry of synthetic aperture radar (DInSAR) can be used to generate high-precision surface displacement maps in continuous permafrost environments, capturing isotropic subsidence and uplift associated with the seasonal freeze thaw cycle. We generated using DInSAR ultrafine-beam Radarsat-2 data for summers 2013, 2015, 2019 at Cape Bounty, Melville Island, examined them combination a land-cover classification, meteorological data, topographic optical satellite imagery, situ measures soil moisture, temperature, depth frost table. Over three years studied, magnitudes (estimated uncertainty ± 1 cm) up 10 cm per 48-day stack were detected. However, generally, was far smaller (up 4 cm). Surface found most extensive greatest magnitude low-lying, wet, steeply sloping areas. The few areas where large vertical displacements (>2.5 detected multiple clustered low lying areas, on steep slopes or ridges, close coast. also captured expansion two medium-sized retrogressive slumps (RTS), exhibiting widespread negative change slump floor.