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Sentinel-1 SAR interferometry for surface deformation monitoring in low-land permafrost areas
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Orientador(es)
Resumo(s)
Low-land permafrost areas are subject to intense freeze-thaw cycles and characterized
by remarkable surface displacement. We used Sentinel-1 SAR interferometry (InSAR) in order
to analyse the summer surface displacement over four spots in the Arctic and Antarctica since
2015. Choosing floodplain or outcrop areas as the reference for the InSAR relative deformation
measurements, we found maximum subsidence of about 3 to 10 cm during the thawing season
with generally high spatial variability. Sentinel-1 time-series of interferograms with 6–12 day time
intervals highlight that subsidence is often occurring rather quickly within roughly one month in
early summer. Intercomparison of summer subsidence from Sentinel-1 in 2017 with TerraSAR-X in
2013 over part of the Lena River Delta (Russia) shows a high spatial agreement between both SAR
systems. A comparison with in-situ measurements for the summer of 2014 over the Lena River Delta
indicates a pronounced downward movement of several centimetres in both cases but does not reveal
a spatial correspondence between InSAR and local in-situ measurements. For the reconstruction of
longer time-series of deformation, yearly Sentinel-1 interferograms from the end of the summer were
considered. However, in order to infer an effective subsidence of the surface through melting of excess
ice layers over multi-annual scales with Sentinel-1, a longer observation time period is necessary.
Descrição
Palavras-chave
Permafrost Arctic Antarctica Subsidence InSAR Sentinel-1
Contexto Educativo
Citação
Strozzi, Tazio, Antonova, Sofia, Günther, Frank, Mätzler, Eva, Vieira, Gonçalo, Wegmüller, Urs, Westermann, Sebastian, & Bartsch, Annett (2018). Sentinel-1 SAR interferometry for surface deformation monitoring in low-land permafrost areas. Remote Sensing, 10(9),1360. https://doi.org/10.3390/rs10091360.
Editora
MDPI