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The use of hydrological (surface wind and sea wave slope) dependences for the calculation of microwave characteristics of the ldquoocean-atmosphererdquo system by Kirchhoff method is discussed here. As an important example, we review results of our experiment on bistatic sensing of the sea surface. In this experiment, the Sun is a powerful natural source of microwave radiation noise for the sea surface sensing. For the receiving of solar radiation in the region of quasi-specular scattering, three two-polarization radiometers (0.8, 2.25, and 6.0 cm) are used. The results of joint hydrological and radiometric experiments (wind speed from 0 to 15 m/s) are reported. As a result, the improved quantitative model for microwave (3-50-GHz band) radiometric calculations in remote sensing of the ldquoocean-atmosphererdquo system is presented.