Influence of Optically Active Substances on Light Attenuation in a Tropical Eutrophic Urban Reservoir

Influence of Optically Active Substances on Light Attenuation in a Tropical Eutrophic Urban Reservoir

This study investigated the impact of optically active substances on light attenuation in a tropical eutrophic urban reservoir under different seasonal conditions. Diffuse attenuation coefficients for photosynthetically active radiation (<i>Kd</i><sub>PAR</sub>) and ultraviol...

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Main Authors: Renata C. H. Amancio, Stella P. Pacheco, Karen A. F. Moura, Bianca L. Valle, Julia T. C. Alves, Fernanda F. Melo, Vitor J. G. Silva, Lívia S. Botelho, Raquel T. Rocha, Daiana R. Pelegrine, Thiago M. Salgueiro, Carlos M. O. Tadeu, Vitor G. Elian, Giulia A. Ducca, Arielli G. Zavaski, Renata L. Moreira, Winnícius M. S. Sá, Estevão E. O. Eller, Renato B. de Oliveira-Junior, Ivan M. Monteiro, Lorena T. Oporto, Diego G. F. Pujoni, José F. Bezerra-Neto
Format: Article
Language:English
Published: MDPI AG 2025-03-01
Series:Limnological Review
Subjects:
light attenuation
eutrophic reservoir
diffuse attenuation coefficients
photosynthetically active radiation (PAR)
ultraviolet radiation (UV)
rainfall effects
Online Access:https://www.mdpi.com/2300-7575/25/1/7
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Summary:This study investigated the impact of optically active substances on light attenuation in a tropical eutrophic urban reservoir under different seasonal conditions. Diffuse attenuation coefficients for photosynthetically active radiation (<i>Kd</i><sub>PAR</sub>) and ultraviolet radiation (<i>Kd</i><sub>UVA</sub> and <i>Kd</i><sub>UVB</sub>) were measured at three representative sites and correlated with water quality parameters (chlorophyll-a, total suspended solids [TSS], dissolved organic carbon, and colored dissolved organic matter [CDOM]). The results revealed significant spatial and seasonal differences, with the highest attenuation observed during the rainy season. The Ilha site exhibited the greatest coefficients (<i>Kd</i><sub>PAR</sub> = 6.0 m<sup>−1</sup>, <i>Kd</i><sub>UVA</sub> = 17.9 m<sup>−1</sup>, <i>Kd</i><sub>UVB</sub> = 19.0 m<sup>−1</sup>), while lower values were recorded at Barragem (<i>Kd</i><sub>PAR</sub> = 2.4 m<sup>−1</sup>, <i>Kd</i><sub>UVA</sub> = 9.1 m<sup>−1</sup>, <i>Kd</i><sub>UVB</sub> = 12.0 m<sup>−1</sup>) and Igrejinha (<i>Kd</i><sub>PAR</sub> = 3.1 m<sup>−1</sup>, <i>Kd</i><sub>UVA</sub> = 10.8 m<sup>−1</sup>, <i>Kd</i><sub>UVB</sub> = 11.9 m<sup>−1</sup>). Statistical analyses showed strong correlations between TSS and <i>Kd</i><sub>PAR</sub> (r = 0.66) and between CDOM and both <i>Kd</i><sub>UVA</sub> (r = 0.66) and <i>Kd</i><sub>UVB</sub> (r = 0.59), with regression models confirming TSS and CDOM as key predictors of light attenuation. These findings underscore the pivotal role of particulate and dissolved organic matter in underwater light dynamics, emphasizing the need to reduce their input during periods of heavy rainfall.
ISSN:2300-7575

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