Molecular Insights into Gas–Particle Partitioning and Viscosity of Atmospheric Brown Carbon

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 4, 2024

Biomass burning organic aerosol (BBOA), containing brown carbon chromophores, plays a critical role in atmospheric chemistry and climate forcing. However, the effects of evaporation on BBOA volatility viscosity under different environmental conditions remain poorly understood. This study focuses molecular characterization laboratory-generated proxies from wood pyrolysis emissions. The initial mixture, "pyrolysis oil (PO

Language: Английский

High Viscosity and Two Phases Observed over a Range of Relative Humidities in Biomass Burning Organic Aerosol from Canadian Wildfires

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Biomass burning organic aerosol (BBOA) is a major contributor to in the atmosphere. The impacts of BBOA on climate and health depend strongly upon their physicochemical properties, including viscosity phase behavior (number types phases); these properties are not yet fully characterized. We collected field samples during 2021 British Columbia wildfire season constrain at range relative humidities compared them previous studies BBOA. Particles from all exhibited two-phased with polar hydrophilic nonpolar hydrophobic phase. used poke-flow technique estimate particles. Both phases had viscosities >108 Pa s up 50%. Such high correspond mixing times within 200 nm particles >5 h. Two have implications for how should be treated atmospheric models.

Language: Английский

Cellular and metabolic impacts of repeated sub-acute exposures to biomass-burning extracts in vitro

Ecotoxicology and Environmental Safety, Journal Year: 2024, Volume and Issue: 289, P. 117491 - 117491

Published: Dec. 9, 2024

Language: Английский