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Article

Seasonality Analysis of Sentinel-1 and ALOS-2/PALSAR-2 Backscattered Power over Salar de Aguas Calientes Sur, Chile

1
Magíster en Teledetección, Escuela de Ingeniería Forestal, Facultad de Ciencias, Universidad Mayor, Santiago 8340589, Chile
2
Grupo de Teledetección Cuantitativa, Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Buenos Aires 1428, Argentina
3
Subgerencia de Recursos Naturales, Centro de Información de Recursos Naturales (CIREN), Santiago 7501556, Chile
4
Hémera Centro de Observación de la Tierra, Escuela de Ingeniería Forestal, Facultad de Ciencias, Universidad Mayor, Santiago 8340589, Chile
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(6), 941; https://doi.org/10.3390/rs12060941
Received: 31 December 2019 / Revised: 18 February 2020 / Accepted: 22 February 2020 / Published: 14 March 2020
(This article belongs to the Section Remote Sensing in Geology, Geomorphology and Hydrology)
Seasonal changes control the development of salt crust over the Salar de Aguas Calientes Sur located in Andes Highlands, Chile. Precipitations throughout the Altiplanic winter (December to March) and austral winter (June to September) caused ponds to enlarge and surface salt crusts to dissolve driving roughness and dielectric features of the salar surface change over time. A four-year time series backscattering coefficient analysis, obtained by Sentinel 1 and ALOS-2/PALSAR-2 with 10 m of spatial resolution, demonstrated the capability of microwaves to discriminate seasonal patterns illustrated in this paper. Both sensors showed to be sensitive to changes in the surface crust due to weather conditions. Backscattered power gradually increased during the driest months as the rough salt crusts develop and decreased rapidly due to precipitations or flooding events, which lead to a smoothing appearance to radar. The high temporal frequency of acquisition in Sentinel 1 (5–13 scenes/month) allowed the discrimination among climate and annual seasonality and episodic events in the C-band backscatter coefficient. On the other hand, ALOS-2/PALSAR-2 showed subsurface changes at L-band since the salinity of the brine in the soil reduces the penetration depth of backscattered power for shorter wavelengths. Results might be useful to monitor salars with geographic and weather conditions similar to Salar de Aguas Calientes Sur. View Full-Text
Keywords: microwaves; evaporitic environment; Sentinel 1; ALOS-2/PALSAR-2; Chile microwaves; evaporitic environment; Sentinel 1; ALOS-2/PALSAR-2; Chile
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MDPI and ACS Style

Delsouc, A.; Barber, M.; Gallaud, A.; Grings, F.; Vidal-Páez, P.; Pérez-Martínez, W.; Briceño-De-Urbaneja, I. Seasonality Analysis of Sentinel-1 and ALOS-2/PALSAR-2 Backscattered Power over Salar de Aguas Calientes Sur, Chile. Remote Sens. 2020, 12, 941. https://doi.org/10.3390/rs12060941

AMA Style

Delsouc A, Barber M, Gallaud A, Grings F, Vidal-Páez P, Pérez-Martínez W, Briceño-De-Urbaneja I. Seasonality Analysis of Sentinel-1 and ALOS-2/PALSAR-2 Backscattered Power over Salar de Aguas Calientes Sur, Chile. Remote Sensing. 2020; 12(6):941. https://doi.org/10.3390/rs12060941

Chicago/Turabian Style

Delsouc, Analia, Matías Barber, Audrey Gallaud, Francisco Grings, Paulina Vidal-Páez, Waldo Pérez-Martínez, and Idania Briceño-De-Urbaneja. 2020. "Seasonality Analysis of Sentinel-1 and ALOS-2/PALSAR-2 Backscattered Power over Salar de Aguas Calientes Sur, Chile" Remote Sensing 12, no. 6: 941. https://doi.org/10.3390/rs12060941

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