Calculating irradiance penetration into water bodies from the measured beam attenuation coefficient Abstract-The relationships between the numerical values and spectral distributions of the downward irradiance attenuation coefficient, Kd,*. and the beam attenuation coefficient, c,, were investigated. Using experimental data for the Baltic Sea with Secchi disk transparency of 1.5-6 m, we obtained formulae allowing us to determine the spectra of the scattering coefficient in the range of 400-700 nm from data for the beam attenuation coefficient at 580-nm wavelength. Formulae connecting the values of the downward irradiance attenuation coefficient, the absorption coefficient, and the scattering coefficient for different illumination conditions were then used to determine the spectra of Kd, * from measured c, spectra. A preliminary test of this method was carried out based on experimenta
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