Biomass-burning organic aerosols as a pool of atmospheric reactive triplets to drive multiphase sulfate formation DOI Creative Commons
Zhancong Liang, Liyuan Zhou,

Yuqing Chang

и другие.

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(51)

Опубликована: Дек. 13, 2024

Biomass-burning organic aerosol(s) (BBOA) are rich in brown carbon, which significantly absorbs solar irradiation and potentially accelerates global warming. Despite its importance, the multiphase photochemistry of BBOA after light absorption remains poorly understood due to challenges determining oxidant concentrations reaction kinetics within aerosol particles. In this study, we explored photochemical reactivity particles S(IV) oxidation sulfate. We found that sulfate formation under is predominantly driven by photosensitization involving triplet excited states ( 3 * ) instead iron, nitrate, photochemistry. Rates three orders magnitude higher than those observed bulk solution, primarily fast interfacial reactions. Our results highlight chemistry can greatly contribute sulfate, as an example secondary pollutants. Photosensitization will likely become increasingly crucial intensified wildfires.

Язык: Английский

Unexpectedly High Levels of H2O2 Drive Sulfate Formation over the Residual Layer in Beijing DOI
Pengfei Liu,

Shuyuan Jia,

Shuying Li

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Hydrogen peroxide (H2O2) plays a key role in atmospheric chemistry, but knowledge of its variation, sources, and impact on sulfate formation remains incomplete, especially the urban boundary layer aloft. Here, we conducted field campaign with measurements H2O2 related species at tower-based site (∼528 m above ground surface) Beijing spring 2022. The observed hourly concentration reached up to 21.2 ppbv an average value 3.4 ± 3.7 during entire observation period, which was higher than values from previous observations throughout world. budget revealed that two known sources (self-reaction HO2 radicals ozonolysis alkenes) could not account for significant H2O2, leading considerable unknown source strength (∼0.14–0.53 h–1) noon after sunset. Based levoglucosan signal, distribution fire points, backward trajectories, biomass burning emissions southwest (e.g., North China Plain) were found contribute greatly formation. Besides, photochemical aging PM2.5 might also have potential production noon. unexpectedly high concentrations aloft made vital contribution (0.2–1.1 μg m–3 h–1), be transported surface turbulent mixing. Our findings provide improved understanding chemistry megacity, as well

Язык: Английский

Процитировано

1
Recent advancements in observations, sources, and environmental effects of atmospheric hydrogen peroxide (H2O2) DOI
Lian Duan,

Shuyuan Jia,

Xuran Li

и другие.

Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121230 - 121230

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Biomass-burning organic aerosols as a pool of atmospheric reactive triplets to drive multiphase sulfate formation DOI Creative Commons
Zhancong Liang, Liyuan Zhou,

Yuqing Chang

и другие.

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(51)

Опубликована: Дек. 13, 2024

Biomass-burning organic aerosol(s) (BBOA) are rich in brown carbon, which significantly absorbs solar irradiation and potentially accelerates global warming. Despite its importance, the multiphase photochemistry of BBOA after light absorption remains poorly understood due to challenges determining oxidant concentrations reaction kinetics within aerosol particles. In this study, we explored photochemical reactivity particles S(IV) oxidation sulfate. We found that sulfate formation under is predominantly driven by photosensitization involving triplet excited states ( 3 * ) instead iron, nitrate, photochemistry. Rates three orders magnitude higher than those observed bulk solution, primarily fast interfacial reactions. Our results highlight chemistry can greatly contribute sulfate, as an example secondary pollutants. Photosensitization will likely become increasingly crucial intensified wildfires.

Язык: Английский

Процитировано

1