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- W4313358009 abstract "Atmospheric cluster ions are important constituents in the atmosphere. Concentrations and compositions of cluster ions govern their effects on atmospheric chemistry, air quality, and human health. However, quantitative research on ion composition is rare, especially in an urban atmosphere where pollution levels and human populations are intense. In this study, we measure negative cluster ion compositions using an atmospheric pressure interface high-resolution time-of-flight mass spectrometer in urban Beijing. We demonstrate the feasibility of quantifying cluster ion compositions with simultaneous in-situ measurements by a neutral cluster and air ion spectrometer. The median concentrations of negative cluster ions smaller than 1.6 nm were 85 (61–112 for 25–75 %) cm-3, decreasing significantly with an increasing condensation sink (CS). These concentrations are far lower than those observed at comparatively clean sites due to the higher CS in polluted environments. The ions NO3- and HSO4-, together with organic ions with the adducts of NO3- and HSO4-, were the most abundant in urban Beijing, and the organic ions in the atmosphere were similar in composition to those oxygenated organic molecules charged in a chemical ionization mass spectrometer with NO3- as the reagent ions. It was shown that the ambient atmosphere is a natural ion-molecular reaction chamber with NO3- and HSO4- as the main reagent ions. Compared to the clean sites, negative cluster ions in Beijing are composed of more NO3- and CHON organic ions due to higher NOx concentrations and higher fractions of CHON molecules in overall oxygenated organic species. Using dynamic equilibrium equations to examine the fate of HSO4- and C3H3O4- in the atmosphere, we found that their main sources to be the ionization of H2SO4 and C3H4O4 by NO3- and their main loss being the condensational loss onto aerosol particles (73–75 %), followed by ion-molecule reaction losses (19 %), and ion-ion recombination losses (6–8 %)." @default.
- W4313358009 created "2023-01-06" @default.
- W4313358009 date "2022-12-31" @default.
- W4313358009 modified "2023-10-17" @default.
- W4313358009 title "Comment on egusphere-2022-1108" @default.
- W4313358009 doi "https://doi.org/10.5194/egusphere-2022-1108-rc1" @default.
- W4313358009 hasPublicationYear "2022" @default.
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