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Preprints
https://doi.org/10.5194/egusphere-2023-2605
https://doi.org/10.5194/egusphere-2023-2605
21 Dec 2023
 | 21 Dec 2023

Toward Long-Term Monitoring of Regional Permafrost Thaw with Satellite InSAR

Taha Sadeghi Chorsi, Franz J. Meyer, and Timothy H. Dixon

Abstract. We estimate active layer thickness (ALT) for part of northern Alaska’s permafrost zone for summer 2017 to 2022 using satellite data from Sentinel-1 and ICESat-2. Interferograms were inverted using a Short Baseline Subset (SBAS) approach to estimate the amplitude of seasonal subsidence. ALT was estimated from the measured subsidence. ICESat-2 products were used to validate the InSAR displacement time-series. Most subsidence occurs between June and August in our study area. The maximum amplitude of seasonal subsidence was 2–6 cm, with ALT exceeding 1.5 m. Estimated ALT is in good agreement with in-situ and other remotely sensed data, but is sensitive to assumed thaw season onset, indicating the need for reliable surface temperature data. Our results suggest the feasibility of long-term permafrost monitoring with satellite InSAR.

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Journal article(s) based on this preprint

20 Aug 2024
Toward long-term monitoring of regional permafrost thaw with satellite interferometric synthetic aperture radar
Taha Sadeghi Chorsi, Franz J. Meyer, and Timothy H. Dixon
The Cryosphere, 18, 3723–3740, https://doi.org/10.5194/tc-18-3723-2024,https://doi.org/10.5194/tc-18-3723-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Active layer, the soil or sediment layer above permafrost, thaws and freezes seasonally. The...
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