Sulfate Sources in Carbonaceous Aerosol Particles in the Urban Atmosphere: The Case of Irkutsk

Izvestiya, Atmospheric and Oceanic Physics - According to monitoring data, it is found that the main source of sulfates in carbonaceous particles in the atmosphere of Irkutsk is sulfur dioxide...     

On the influence of atmospheric chemical reactions on the ion composition of aerosol particles in the Baikal region

Monitoring data on the ion composition of aerosols and gas admixtures in the background and polluted atmosphere of the Lake Baikal region are presented. The ion composition and morphology of aerosols are affected by heterogeneous chemical reactions and variations in relative humidity. Two types of aerosol particles are revealed over this region. The fraction of solid particles recorded in most episodes includes primarily carbonates of alkaline and alkaline-earth metals. With increased atmospheric humidity, these particles are engaged in heterogeneous chemical reactions with gas-phase NH₃ and H₂SO₄, proceeding through the phase of watering. As a result, the composition of these aerosols is changed, and a fraction of aqueous H₂O/H₂SO₄/(NH₄)₂SO₄ aerosol particles of a different composition is formed. On the basis of a physical and chemical analysis of monitoring data on the aerosol composition and concentrations of gas admixtures, the average aerosol-size distribution of different types is estimated. For the first time, the mean acidity of aqueous aerosol particles is estimated.     

Dynamics of Sulfate Formation in the Atmospheric Droplet Phase with the Participation of Transition Metal Ions

Izvestiya, Atmospheric and Oceanic Physics - Laboratory data on the kinetics of the aqueous-phase oxidation of SO2 with dissolved oxygen in the presence of Mn/Fe ions are summarized as applied to...