The radiobrightness and depth of frozen soil during cycles of freezing and thawing

In this paper are presented the results of experimental observation and theoretical simulation for the diurnal dynamics of radiobrightness at frequencies of 1.4 and 6.9 GHz in the process of topsoil cyclic freezing and thawing. Using the radiobrightnesses observed, the dynamics of the freezing layer thickness have been determined and the phenomenon of nonisothermal transport of moisture through the topsoil soil layer have been detected. It is also found that the thickness of the transition layer, which is located between the frozen layer and the underlying thawed soil, increases as the depth of frozen layer grows.