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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 4, pp. 209-222

Remote assessment of soil moisture content in one-meter layer using SMOS satellite data

A.N. Romanov 1 , I.V. Khvostov 1 , I.V. Ryabinin 1 , D.A. Romanov 1 
1 Institute for Water and Environmental Problems SB RAS, Barnaul, Russia
Accepted: 12.08.2024
DOI: 10.21046/2070-7401-2024-21-4-209-222
In this paper, we investigate the possibility of remote determination of soil moisture content in one-meter-thick layer based on brightness temperatures of the underlying surface measured by the SMOS (Soil Moisture Ocean Salinity) satellite at a wavelength of 21 cm. For this purpose, we propose a new approach based on the use of experimentally established dependencies between the moisture content in adjacent soil layers, starting from the surface and down to a depth of 1 m. The studies were conducted in the Kulunda steppe (Altai Krai). In the field experiment, volumetric moisture (W) and soil moisture content (h) were determined at test sites at different depths from the surface to a depth of 1 m. Based on the SMOS satellite data (L1c product) and field measurements of W and h, the dependence of brightness temperature at horizontal polarization on soil moisture content in the surface layer of 0–5 cm was established. The obtained dependencies were used to calculate the total moisture content in one-meter soil layer H0–100. From a comprehensive analysis of satellite data, field and laboratory measurements, a satisfactory agreement was obtained between the values of H0–100 determined by contact (thermostat-weight) and remote (radiophysical) methods.
Keywords: soil moisture, brightness temperature, emissivity, refractive and absorption indices, microwave range, SMOS satellite
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