An investigation into the relationship between light absorption budget and trophic status in inland waters

Autor(es)

Rodrigues, Thanan ^[1] ; Alcantara, Enner ^[2] ; Rotta, Luiz ^[3] ; Bernardo, Nariane ^[3] ; Watanabe, Fernanda ^[3]

Afiliação do(s) autor(es)

^[1] Fed Inst Educ Sci & Technol Para State, Castanhal, PA - Brazil

^[2] Sao Paulo State Univ, Dept Environm Engineer, Sao Jose Dos Campos, SP - Brazil

^[3] Sao Paulo State Univ, Dept Cartog, Presidente Prudente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGICAL INDICATORS; v. 115, AUG 2020.
• Citações Web of Science: 1

Resumo

The optical properties of the water can give comprehensive information about the in-water constituents which is directly related to concentration, size and composition, all essential for the development of bio-optical algorithms. Aiming to provide new observations about optical properties of water in two distinct reservoirs situated along the cascade system of Tiete River: Barra Bonita (BB) and Nova Avanhandava (Nav), this study described and discussed their inherent optical properties (IOPs) in terms of the absorption contribution. BB showed a dominance in the phytoplankton fraction at all visible wavelengths, and Nav by nonalgal particle absorption (a(NAP)), mainly at the blue and green wavelengths. The mass-specific absorption coefficient of phytoplankton at 443 nm observed in Nav and BB corroborated with the assumption that the trophic state decreases from oligotrophic to hypereutrophic. The a(NAP) (lambda) did not show a seasonal pattern between field campaigns and reservoirs. The absorption coefficient of particulate enhanced the strong influence of phytoplankton pigments along the visible spectrum in BB, whereas Nav only displayed the peak at 675 nm represented by chlorophyll a absorption and high contribution of non-algal particle and colored dissolved organic matter in the blue region. These findings recommend the use of different modelling approaches to estimate water quality parameters from both sites when the inputs of the models consider the specific information about the IOPs and their relation with the in-water constituents. (AU)

• Processo FAPESP: 15/21586-9 - Re-parametrização do algoritmo quase-analítico (QAA) para estimativa das propriedades ópticas inerentes nos reservatórios do Rio Tietê
• Beneficiário: Enner Herenio de Alcântara
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/19821-1 - Parametrização de modelo bio-óptico para o estudo da concentração de clorofila-A ao longo de reservatórios em cascata
• Beneficiário: Enner Herenio de Alcântara
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/00259-0 - Desenvolvimento de algoritmos para estimativa de parâmetros de qualidade de água via espaço
• Beneficiário: Enner Herenio de Alcântara
• Modalidade de apoio: Auxílio à Pesquisa - Regular