Spatial and seasonal variations in attenuation of solar ultraviolet radiation in Lake Biwa, Japan

Journal of Photochemistry and Photobiology. B, Biology
Kazuhide Hayakawa, Yuko Sugiyama

Abstract

Seasonal changes in diffuse ultraviolet (UV) and visible light attenuations and inherent optical properties in the lake water were monitored at the pelagic and littoral shallow zones of Lake Biwa which features a broad range of optical conditions within a single large water body. We considered the absorption factors that affect UV attenuation, and clarified the contribution of the absorption of suspended particles and chromophoric dissolved organic matter (CDOM) by multiple regression analyses of the monitoring data. The variability of UV attenuations in the lake demonstrated a strong contrast between the pelagic and the shallow zones. The latter were characterized by turbid systems supplying suspended matter as well as CDOM, whereas the former was far from the turbid systems in the littoral zone or the lake bottom. In this lake, the regulation of UV and light attenuations is rendered competitive by the absorption of suspended particles and CDOM in the lake water, hence, the UV penetration has both spatial and temporal variability based on changes in the physical and biological condition of the lake.

References

Jun 22, 2005·Journal of Photochemistry and Photobiology. B, Biology·Luca BracchiniClaudio Rossi
Jan 4, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Kåre EdvardsenLage Aksnes

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Citations

Dec 1, 2010·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Yunlin ZhangXiaohan Liu
Jan 22, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·D-P HäderR C Worrest
Mar 30, 2010·Environmental Science & Technology·Lars WörmerAntonio Quesada
Sep 3, 2010·Environmental Science & Technology·Nobuhisa YamajiHideshige Takada

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