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- Title
Measurement report: Diurnal and temporal variations of sugar compounds in suburban aerosols from the northern vicinity of Beijing, China: An influence of biogenic and anthropogenic sources.
- Authors
Verma, Santosh Kumar; Kimitaka Kawamura; Fei Yang; Pingqing Fu; Yugo Kanaya; Zifa Wang
- Abstract
Sugar compounds (SCs) are major water-soluble constituents in atmospheric aerosols. In this study, we investigated their molecular compositions and abundances in the northern receptor site (Mangshan) of Beijing, China, to better understand the contributions from biogenic and anthropogenic sources using a gas chromatography-mass spectrometry technique. The sampling site receives anthropogenic air mass transported by southerly winds from Beijing, while relatively clean air mass transported by northerly winds from the forest areas. Day- and nighttime variations were analyzed for anhydrosugars, primary sugars, and sugar alcohols in autumn 2007. Concentrations of overall SCs ranged from 30.8 to 875 ng m-3 (avg. 325 ng m-3), showing diurnal variations with higher levels in daytime (351 ng m-3) than nighttime (276 ng m-3). Interestingly, biomass burning (BB) tracers were more abundant in nighttime than daytime, while other SCs showed different diurnal variations. Levoglucosan was found as a dominant sugar among the observed SCs, indicating an intense influence of BB over Mangshan. The levels of fungal tracers (arabitol and mannitol) were higher in daytime than nighttime, suggesting a significant transport of fungal spores and microbes to the receptor site by atmospheric transport from Beijing area. The plant emissions from Mangshan forest park significantly control the diurnal variations of glucose and fructose. The pollen tracer (sucrose) showed a clear diurnal variation, peaking in daytime due to higher ambient temperature and wind speed. We found that soil dust contributes to trehalose in daytime while microorganisms were responsible to its emissions in nighttime. The meteorological parameters (relative humidity, temperature and rainfall) significantly affect the concentrations and diurnal variations of SCs. Positive matrix factorization analysis suggested that local BB and bioaerosols transported from Beijing area were significant sources of SCs. (289)
- Subjects
BEIJING (China); BIOGENIC amines; SUGAR; AEROSOLS; ATMOSPHERIC aerosols; ATMOSPHERIC transport; AIR masses; CARBONACEOUS aerosols; MICROBIOLOGICAL aerosols
- Publication
Atmospheric Chemistry & Physics Discussions, 2020, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2020-734