Spectral variability of the atmosphere downwelling radiation measured by microwave radiometer-spectrometer in the range of 18–27 GHz

Measurements were made with use of microwave radiometer-spectrometer P22M working in the range of 18–27.2 GHz with a spectral resolution of 200 MHz. Experimental results were compared with model calculations. Along with general correspondents of experimental and model results, there are some mismatches in the details. Variability of spectral characteristics of radiation is analyzed on a series of measurements obtained under different weather conditions: clear sky, clouds and the initial stage of precipitation. Such measurement may be useful for development of new techniques in vertical atmospheric profiles retrieval.