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- W2792542007 abstract "Abstract In this paper, we examine biomass burning (BB) events at the Mt. Bachelor Observatory (MBO) during the summer of 2015. We explored the photochemical environment in these BB plumes, which remains poorly understood. Because we are interested in understanding the effect of aerosols only (as opposed to the combined effect of aerosols and clouds), we carefully selected three cloud‐free days in August and investigate the photochemistry in these plumes. At local midday (solar zenith angle (SZA) = 35°), j (NO 2 ) values were slightly higher (0.2–1.8%) in the smoky days compared to the smoke‐free day, presumably due to enhanced scattering by the smoke aerosols. At higher SZA (70°), BB aerosols decrease j (NO 2 ) by 14–21%. We also observe a greater decrease in the actinic flux at 310–350 nm, compared to 360–420 nm, presumably due to absorption in the UV by brown carbon. We compare our measurements with results from the Tropospheric Ultraviolet‐Visible v.5.2 model. As expected, we find a good agreement (to within 6%) during cloud‐free conditions. Finally, we use the extended Leighton relationship and a photochemical model (Aerosol Simulation Program v.2.1) to estimate midday HO 2 and RO 2 concentrations and ozone production rates ( P (O 3 )) in the fire plumes. We observe that Leighton‐derived HO 2 and RO 2 values (49–185 pptv) and instantaneous P (O 3 ) (2.0–3.6 ppbv/h) are higher than the results from the photochemical model." @default.
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- W2792542007 date "2018-02-18" @default.
- W2792542007 modified "2023-10-16" @default.
- W2792542007 title "Impact of Biomass Burning Plumes on Photolysis Rates and Ozone Formation at the Mount Bachelor Observatory" @default.
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- W2792542007 doi "https://doi.org/10.1002/2017jd027341" @default.
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