Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Язык: Английский

Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Язык: Английский

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