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- W4387453022 abstract "The light absorption of brown carbon (BrC) constituents of biomass burning organic aerosol (BBOA) changes in the atmosphere, in part due to multiphase oxidation. For example, ozonolysis leads to the whitening of primary BrC constituents. Irradiation can also change the properties of BrC. Here, we investigate the interplay between irradiation and multiphase processing by measuring the reactive uptake of ozone to thin films of BBOA before and after exposure to UV radiation in a photoreactor. Thin films were prepared from the lower volatility fraction of BBOA from eastern red cedar, a species associated with wildfires and prescribed fires in the southern Great Plains, United States. Irradiation increased the mass absorption coefficient of the BrC at near-UV and visible wavelengths. It also significantly decreased the reactive uptake of ozone, which was attributed to increased viscosity of the BBOA material. These changes in absorptivity and viscosity are consistent with results of mass spectrometry and volatility tandem differential mobility analysis, which show that high-molecular-weight species constitute a greater fraction of the total mass after irradiation. Our results may have significant implications on the warming effect of BrC, since UV irradiation here both darkens this BBOA material and makes it more resistant to multiphase processing and whitening by ozone under the conditions investigated." @default.
- W4387453022 created "2023-10-10" @default.
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- W4387453022 date "2023-10-09" @default.
- W4387453022 modified "2023-10-17" @default.
- W4387453022 title "Ultraviolet Irradiation Can Increase the Light Absorption and Viscosity of Primary Brown Carbon from Biomass Burning" @default.
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- W4387453022 doi "https://doi.org/10.1021/acsearthspacechem.3c00155" @default.
- W4387453022 hasPublicationYear "2023" @default.
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