Temporal variability of the chemical composition of surface aerosol in the Moscow region in 1999–2005 from the results of infrared spectroscopy of aerosol samples |
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Authors: | L M Shukurova A N Gruzdev |
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Institution: | 1.Obukhov Institute of Atmospheric Physics,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The temporal variability of the chemical composition of surface aerosol with particle diameters of 0.7–2 μm is analyzed. This
analysis is based on the results of measurements of infrared transmission spectra of aerosol samples collected with the use
of a cascade impactor at the Zvenigorod Scientific Station of the Institute of Atmospheric Physics (IAP) in 1999–2005. Seasonal
features of the aerosol chemical composition and its dependence on the particle size are revealed. The interdiurnal variability
of the aerosol composition depends on the season, and it manifests itself more strongly in winter and spring. Air-mass changes
lead to changes in the relation of sulfates and nitrates in the micron fraction of aerosol. The enrichment of samples in nitrates
is especially characteristic of the winter and spring seasons. Compounds containing the NO2 group are often met in the samples of aerosol with particle sizes of 0.7–1.3 μm during the cold time of the year. The estimates
of the optical thickness of micron aerosol in the sulfate absorption band are obtained, and optical-thickness variations of
some scales are detected. The quantitative characteristics of statistical relations between different chemical components
of aerosol inside individual fractions and between chemical components of the micron and submicron fractions are obtained
and analyzed. |
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