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

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(51)

Published: Dec. 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.

Language: Английский

Multiphase Processing of the Water-Soluble and Insoluble Phases of Biomass Burning Organic Aerosol DOI Creative Commons

Habeeb H. Al-Mashala,

Meredith Schervish, Sudantha S. Liyanage

et al.

ACS ES&T Air, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Biomass burning is one of the most significant sources organic aerosol in atmosphere. (BBOA) has been observed to undergo liquid–liquid phase separation (LLPS) give core–shell morphology with hydrophobic encapsulating hydrophilic phase, potentially impacting evolution light-absorbing components, i.e., brown carbon (BrC), through multiphase processes. Here, we demonstrate how processing differs between water-soluble (i.e., hydrophilic) and insoluble hydrophobic) phases BBOA terms reactive uptake ozone a coated-wall flow tube. Effects relative humidity (RH) ultraviolet (UV) irradiation were investigated. Experimental timeseries used inform simulations using multilayer kinetic modeling. Among non-irradiated thin films, coefficient was greatest for at 75% RH (3 × 10–5, corresponding diffusion BrC, DBrC, 3 10–9 cm2 s–1) least same 0% (1 DBrC 1 10–10 s–1). The water-insoluble fell these two (about 1.5 10–5), regardless RH, increased only slightly (8 s–1 9 RH). coefficients both decreased significantly after UV irradiation, consistent transition from viscous liquid solid supported by qualitative microscopy observations. Modeling oxidation primary BrC components atmosphere demonstrated, first, that LLPS may extend lifetime encapsulated species factor moderate high and, also, more than 2.5.

Language: Английский

Citations

0
Rapid Nighttime Darkening of Biomass Burning Brown Carbon by Nitrate Radicals Is Suppressed by Prior Daytime Photochemical Aging DOI
Carolyn Liu-Kang, Laura-Hélèna Rivellini, Xinke Wang

et al.

ACS Earth and Space Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 12, 2025

Language: Английский

Citations

0
Increased UV–Visible Particle Absorption via Evaporation and Drying of Aqueous Droplets Containing Catechol/HONO Solutions DOI
Yutong Wang, Diwen Yang, William D. Fahy

et al.

Environmental Science & Technology Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Language: Английский

Citations

0
Photolytic Mass Loss of Humic Substances Measured with a Quartz Crystal Microbalance DOI Creative Commons
Mingrui Sun, G. Smith

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: 8(8), P. 1623 - 1633

Published: July 11, 2024

Laboratory studies have shown that photolytic mass loss can be a significant sink for secondary organic aerosol (SOA). Here, we use quartz crystal microbalance to measure of Suwannee River Humic Acid (SRHA) and Fulvic (SRFA), surrogates SOA, exposed 254, 300, 405 nm radiation over the course 24 h. We find rates these materials are comparable those laboratory-generated limonene toluene SOA material from study Baboomian et al,

Language: Английский

Citations

1
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

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(51)

Published: Dec. 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.

Language: Английский

Citations

1