On possible effect of mineralized water bodies on microclimate

Microwave radiation of water surface carries the important information on different processes and occurrences taking place in water column and associated with the variations in physical and chemical properties of water, its structure and aggregative state. However, the influence of these processes on the microwave radiation of the earth surface is scantily known. Based on laboratory research of dielectric behavior of water-salt solutions, the work shows the expectancy of drastic variation in brightness temperature of highly mineralized lakes the surface of which in the course of drying presents a salt crust 3... 5 cm thick consisting of dry salts Na₂SO₄, Na₂CO₃, MgSO₄, NaCl, and their crystalline hydrates. It is worth noting that the process of lake drying is rather extended, while its replenishment or the moistening of the salt crust takes a little time and lasts from 3 to 24 hours. In this case the difference of brightness temperature is found in the information from the satellite microwave sounding. The results shows that nonlinear dependence is related to the change in structure and physical properties of an object. In the mass concentration range from freshwater up to saturated solution, the decrease of values, i.e., radiation coefficient varies from 0.36 (typical for freshwater) up to 0.20 (corresponding to saturated solution) is noted. The probable sporadic microwave radiation (registered from the space) may be likely caused by the some natural phenomena. Such sharp changes in brightness temperature of the underlying surface are perceived like powerful outbursts of the microwave radiation.