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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, 2017, Vol. 14, No. 2, pp. 61-71

Microwave radiometric method for measuring soil temperature in Arctic tundra

V.L. Mironov 1, 2 , K.V. Muzalevskiy 1 , Z. Ruzicka 1 
1 L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russia
2 M.F. Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russia
Accepted: 20.03.2017
DOI: 10.21046/2070-7401-2017-14-2-61-71
In this paper, the results of radiothermal remote sensing of soil temperature at a test site on the Yamal Peninsula using full-polarimetry multi-angular brightness temperature (BT) observations at the frequency of 1.4 GHz are presented. The BT data were obtained from the Soil Moisture and Ocean Salinity (SMOS) satellite with the SMOS footprint near the Polar Weather Station Marresale and Vaskiny Dachi, the Russian Federation. The SMOS data covered the period from October 22, 2012 to May 10, 2014. The method to retrieve the soil temperature was based on solving an inverse problem by minimizing the norm of the residuals between the observed and predicted values of BT. The calculation of BT was performed using a semi-empirical model of radiothermal emission which incorporated an attenuation of microwaves in snow pack and a temperature-dependent multi-relaxation spectral dielectric model (TD MRSDM) for organic-rich tundra soil. The TD MRSDM was specifically designed on the base of laboratory measurements of complex permittivity of organic-rich soil samples collected at the test site on the Polar Weather Station Marresale. As a result, in case of frozen soil, the values of root-mean-square error (RMSE) and determination coefficient between the retrieved and measured soil temperatures were determined to be 4.5°C and 0.59, respectively. These results indicate the perspectives of using full-polarimetric multi-angular BT observations in the L-band for the purpose of measuring soil temperature in the Arctic region.
Keywords: microwave radiometry, soil measurements, temperature measurement, Arctic region
Full text

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