Journal
REMOTE SENSING
Volume 13, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/rs13132505
Keywords
DInSAR; permafrost; subsidence; heave; precipitation; Arctic
Categories
Funding
- NSERC
- Science and Operational Applications Research-Education (SOAR-E) initiative [5492]
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By using DInSAR technology in combination with various data sources, it was found that in continuous permafrost environments, seasonal surface displacements mainly occur in low-lying, wet, and steep areas, with maximum magnitudes of up to 10 cm but generally less than 4 cm.
Differential interferometry of synthetic aperture radar (DInSAR) can be used to generate high-precision surface displacement maps in continuous permafrost environments, capturing isotropic surface subsidence and uplift associated with the seasonal freeze and thaw cycle. We generated seasonal displacement maps using DInSAR with ultrafine-beam Radarsat-2 data for the summers of 2013, 2015, and 2019 at Cape Bounty, Melville Island, and examined them in combination with a land-cover classification, meteorological data, topographic data, optical satellite imagery, and in situ measures of soil moisture, soil temperature, and depth to the frost table. Over the three years studied, displacement magnitudes (estimated uncertainty +/- 1 cm) of up to 10 cm per 48-day DInSAR stack were detected. However, generally, the displacement was far smaller (up to 4 cm). Surface displacement was found to be most extensive and of the greatest magnitude in low-lying, wet, and steeply sloping areas. The few areas where large vertical displacements (>2.5 cm) were detected in multiple years were clustered in wet, low lying areas, on steep slopes or ridges, or close to the coast. DInSAR also captured the expansion of two medium-sized retrogressive thaw slumps (RTS), exhibiting widespread negative surface change in the slump floor.
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