Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X0624
Acta Limnologica Brasiliensia
Original Article

Photochemical mineralization of DOM in high humic tropical aquatic ecosystems: ambiguous regulation by watercolor

Mineralização fotoquímica da MOD em ecossistemas aquáticos tropicais húmicos: efeito ambíguo da coloração da água

André Megali Amado; Francisco de Assis Esteves; Albert Luiz Suhett; Ana Luiza Rangel Linhares Lima; Layla Mayer Fonseca; Vinicius Fortes Farjalla

http://dx.doi.org/10.1590/S2179-975X0624 Acta Limnol. Bras. (Online), vol.36, e39, 2024
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Abstract

Aim: Photochemical mineralization is a significant pathway for the total oxidation of Dissolved Organic Carbon (DOC) in aquatic ecosystems. The concentration of DOC, watercolor, solar radiation intensity, diagenetic state of DOC, and oxygen availability are known regulating factors influencing the DOC photochemical mineralization process. However, these studies have not yet assessed the importance of these regulatory factors under extreme conditions of DOC concentration and watercolor. The aims of this study were: (1) to optimize methodological parameters for investigating the photo-degradation process in tropical humic/super-humic aquatic ecosystems; (2) to evaluate the relative importance of regulatory factors influencing photochemical mineralization in tropical humic/super-humic ecosystems; and (3) to measure photochemical mineralization rates in 20 coastal tropical humic/super-humic ecosystems and comparing them with available data worldwide.

Methods: Three types of DOC exposure experiments were conducted: (i) exposing water samples to different solar radiation intensities, (ii) exposing water samples of the same origin but with different DOC concentrations (dilutions) to sunlight and (iii) exposing water samples from a gradient of 20 environments with distinct characteristics to sunlight.

Results: Our results revealed that oxygen concentration became limiting for the photochemical mineralization process in experiments investigating super-humic ecosystems. Watercolor exhibited ambiguous effects on photochemical mineralization; in environments with colored-DOC, increased DOC watercolor favored higher potential photochemical mineralization rates, whereas in super-humic environments, increased DOC watercolor reduced the photochemical mineralization potential due to DOC self-shading.

Conclusions: We emphasize that the measured results in this study represent the highest values of photochemical mineralization ever recorded in the literature.

Keywords

 DOC; coastal lagoons; photo-oxidation; carbon cycling; self-shading

Resumo

Objetivo: A mineralização fotoquímica é uma via significativa para a mineralização de carbono orgânico dissolvido (COD) em ecossistemas aquáticos. A concentração de COD, cor da água, intensidade da radiação solar, estado diagenético do COD e disponibilidade de oxigênio são fatores reguladores conhecidos que influenciam o processo de mineralização fotoquímica do COD. Porém, esses estudos ainda não avaliaram a importância desses fatores reguladores sob condições extremas de concentração de COD e coloração da água. Os objetivos deste estudo foram: (1) otimizar parâmetros metodológicos para investigação do processo de fotodegradação em ecossistemas aquáticos húmicos/super-húmicos tropicais; (2) avaliar a importância relativa dos fatores reguladores que influenciam a mineralização fotoquímica em ecossistemas húmicos/super-húmicos tropicais e (3) medir as taxas de mineralização fotoquímica em 20 ecossistemas húmicos/super-húmicos tropicais costeiros e compará-los com dados disponíveis em todo o mundo.

Métodos: Foram realizados três tipos de experimentos de exposição ao COD: (i) exposição de amostras de água a diferentes intensidades de radiação solar, (ii) exposição de amostras de água da mesma origem, mas com diferentes concentrações (diluições) de COD e, (iii) exposição de amostras de água de um gradiente de 20 ambientes com características distintas à luz solar.

Resultados: Nossos resultados revelaram que a concentração de oxigênio foi limitante para o processo de mineralização fotoquímica em experimentos que investigam ecossistemas super-húmicos. A coloração da água exibiu efeitos ambíguos na mineralização fotoquímica; em ambientes com COD colorido, o aumento da coloração da água favoreceu maiores taxas de mineralização fotoquímica potencial, enquanto em ambientes superhúmicos, o aumento da coloração da água reduziu o potencial de mineralização fotoquímica devido ao auto-sombreamento do DOC.

Conclusões: Enfatizamos que os resultados medidos neste estudo representam os maiores valores de mineralização fotoquímica já registrados na literatura.

Palavras-chave

COD; lagoas costeiras; foto-oxidação; ciclagem de carbono; auto-sombreamento

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Submitted date:
01/22/2024

Accepted date:
09/09/2024

Publication date:
11/11/2024

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