ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 23, 2024

The composition and transformations of biomass burning aerosols (BBA) have been measured onboard the NOAA Twin Otter research aircraft during Fire Influence on Regional to Global Environments Air Quality field study. We analyze real-time aerosol mass spectrometry measurements across three flights afternoon, late night August 28, 2019, for one midsized wildfire. Analysis several metrics showed that optical properties varied depending conditions at fire zone time day BBA was emitted, with substantial variations in available sunlight. total loadings were dominated by organic components a much smaller contribution from inorganic species. A gradual buildup material observed afternoon as plume aged, indicating condensation photochemically formed low-volatility oxidized compounds. Highly hygroscopic ammonium nitrate main component, suggesting potential water content particles likelihood their aqueous-phase reactivity. Depletions particle-phase NO3– Cl– relative carbon monoxide nighttime plumes, respectively, aligning known gas-particle partitioning thermodynamics heterogeneous chemistry dissolved chloride. wavelength-dependent light absorption species higher sampled no significant changes age, despite trends downwind. These differences particle demonstrate processes involved aging are not uniform same wildfire over course depend highly when well phase emissions source.

Language: Английский