Temperature dependence of SMOS/MIRAS, GCOM-W1/AMSR2 brightness temperature and ALOS/PALSAR radar backscattering at arctic test sites

In this study we investigated correlations between soil temperature and radar backscattering coefficient (HH-pol) measured by the ALOS PALSAR at the frequency of 1.26 GHz, and brightness temperatures measured by SMOS/MIRAS (viewing angle 55°, V-pol) at the same frequency and GCOM-W1/AMSR2 (V-pol) in the range of frequencies from 6.9 GHz to 18.7 GHz near Vaskiny Dachi weather station (70.2955N, 68.8835E) over the territory of the Yamal Peninsula. Empirical relationships between brightness temperature, backscattering coefficient and soil temperature have been found, which allow to predict the soil surface temperature on the test site from GCOM-W1 and ALOS PALSAR measurements.