Absorption of solar radiation by atmospheric water vapour

Solar spectra from 0.7 to 2.5 µm were studied under low resolution for different solar zenith angles. The band integrated absorptance ∫ A(v)dv for water vapour bands at 0.8,0.9,1.1,1.4 and 1.9µm were measured and compared with those obtained by Howard et al. and other workers. It was found that although the agreement was satisfactory at lower water-vapour contents, there was significant deviation at high water-vapour content.