Variation of Light Absorption by Yellow Substance in Surface Layer of Continental Reservoir
Abstract
The paper presents experimental data on variation of light absorption by yellow substance in the surface layer of the Novosibirsk reservoir, obtained in August 2017 during hydrological, hydrobiological and hydrochemical investigations. The calculated light absorption index by yellow substance in the spectral range of 400-800 nm varied from 1.0 to 9.7 m
-1, the light attenuation index — from 2.0 to 14.0 m-1. Concentration of chlorophyll "a", organic-mineral suspension, and yellow substance was measured. Chlorophyll content in water changed within 7.0-39.3 mg/m3, the average mass concentration of suspended particles made up 14.30 mg/l. Concentration of yellow substance in the reservoir, evaluated by optical method using the rate of light absorption by yellow substance at the wavelength X=450 nm, varied from 17.4 to 30.8 g/m3. To estimate the exponential slope coefficients of the spectral absorption curve of the yellow substance in the Novosibirsk reservoir, the appropriate approximation dependences are constructed. The assessment of spectral contribution of major optically active water components (yellow substance, suspension, chlorophyll, clean water) to the light attenuation is carried out for the surface layer of the reservoir. It is revealed that the most significant contribution at all sites of the reservoir is made by yellow substance.
DOI 10.14258/izvasu(2018)4-01
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