Estimating of soil salinity by passive microwave observations at C band

Abstract

The experimental results of a comparative research of an radiothermal radiation at frequency 6.25 GHz of sites of the salted and not salted soils were at identical meteorological conditions are presented. It is shown that the parameters of surface roughness, soil moisture profile and evaporation after intensive short-time irrigation depend on of soil surface layer salinity. This results in distinction in emissivity of the salted and not salted sites in processes drying and freezing/thawing. The value of initial brightness contrast and speed of its change depend on difference in salinity of test sites.