Evaluation of suspended matter effect on spectral light attenuation in Lake Teletskoye
https://doi.org/10.7868/S2073667320010049
Abstract
This study presents the results of the light attenuation coefficient measurements in the range of 400–800 nm in the waters of Lake Teletskoye, obtained in a summer cruise (19–23 June 2018). During the cruise in various locations, the attenuation coefficient values varied (to the base of natural logarithm) in the range of 0.2–4.4 m–1 within the stated wavelength range.
The relative spectral effect of the suspended matter was calculated along with the other major optically active components of the lake water: yellow matter, chlorophyll-a and pure water to assess the contribution of suspension to the total attenuation coefficient. Suspended matter spectral contribution to light attenuation at 430 nm wavelength appeared in the range of 2.3–33.4 %, and at 550 nm — 5.9–47.8 %. Optical microscopy was used to determine the particle size distribution and the number concentration of suspended particles. According to the measurements, weight-average particle radii in the water samples varied primarily within the range 0.5–0.8 µm, while the concentrations differed from 0.9∙106cm–3 to 3.3∙106cm–3. Particle size distribution was approximated by the Junge function with a determination coefficient from 0.63 to 0.99.
Keywords
method of optical microscopy,
spectral light attenuation,
suspended matter concentration,
particle radius,
particle size distribution,
Junge function,
Lake Teletskoye
Supporting agencies: This work was carried out as part of the state assignment of the IWEP SB RAS (project registration number AAAA-A17–117041210241–4).
About the Authors
О. B. Akulova
Institute for Water and Environmental Problems, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Barnaul
V. I. Bukatyi
Institute for Water and Environmental Problems, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Barnaul
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Review
For citations:
Akulova О.B., Bukatyi V.I. Evaluation of suspended matter effect on spectral light attenuation in Lake Teletskoye. Fundamental and Applied Hydrophysics. 2020;13(1):35-44. https://doi.org/10.7868/S2073667320010049
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