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The influence of aerosol, described by means of the aerosol optical thickness, on the atmospheric radiance - the sum of the Rayleigh and aerosol components is analysed. Assuming that the Rayleigh radiance is known, the contribution of the aerosol radiance component to the atmospheric one depends on the amplitude of aerosol optical thickness. The amplitude reflects the temporal variability of the aerosol optical thickness caused by appearing of water soluble particles or particles from continental air masses. It was found that the contribution of the aerosol radiance increases with wavelength increases from about 2% (at 400 nm) to about 12% (at 670 nm) and is the most sensitive to the amplitude values of aerosol optical thickness at wavelength 670 nm. Keywords: Baltic Sea, aerosol radiance, Rayleigh radiance, atmospheric radiance, aerosol optical thickness, total solar spectral irradiance, diffuse solar spectral irradiance, empirical orthogonal functions, atmospheric correction, marine aerosols
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