The IR radiation transmission function P for cloudiness depends on the
mass of water droplets containing in the vertical air column of a unit section (cloud water storage).
Cloudiness practically absorbs all infrared radiation at
Qδ >0,03. Real clouds always contain Qδ >0,03.
Due to strong absorption of the IR radiation by water vapor, carbon dioxide, and , particularly, by clouds, the significant part of the terrestrial radiation is absorbed by the atmosphere, while an appreciable part of the SR is allowed to pass through the atmosphere. Thus, the atmosphere provides for a strong warming effect of the Earth surface.