New particle formation in a realistic daytime urban atmosphere: SO2/NOx/O3/hydrocarbon air mixtures Public Deposited

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  • March 21, 2019
Creator
  • Galloway, Katherine Elizabeth
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
Abstract
  • The particle nucleation mechanism of binary mixtures of water and sulfuric acid is of recent interest to the scientific community. To observe sulfuric acid-water induced particle nucleation and growth in a more realistic controlled urban environment, a series of daytime experiments were conducted in the 270 m3 dual UNC Aerosol Smog Chamber with near-ambient levels of organics in the presence of other atmospheric aerosols and sulfur dioxide. Experimental and modeling results support the theory that stable nucleation and growth in the urban atmosphere are related to gas-phase sulfuric acid. The number of stable nuclei generated in the individual experiments may be approximated by an exponential fit of sulfuric acid and in some cases, toluene. If all the model generated sulfuric acid appears in the particle phase, sulfate would contribute 5 to 25% of the initial burst of the particles, depending on the concentrations of reacting species and the reaction time.
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  • In Copyright
Advisor
  • Kamens, R. M.
Degree granting institution
  • University of North Carolina at Chapel Hill
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  • Open access
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