The values of the inherent optical properties -attenuation, absorption, and scattering - were measured with an underwater spectral absorption/attenuation meter ac-9 in 12 Finnish and Estonian lakes in summer 1997. The lakes selected for the study were quite different in their optical properties. Our results showed significant differences between the lakes as well as in a single lake during the summer. The difference of the attenuation coefficient between May and August in four lakes was from 60 to 80%. Also the spectral dependence of the scattering coefficient showed high variability. The wavelength dependence was greater in some more turbid lakes than in clear lakes, which is contradictory to previous results.
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Herlevi et al. (1999) studied this question.
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