Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride

Other literature type English OPEN
Bertram, T. H. ; Thornton, J. A. (2009)

The heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> on mixed organic-inorganic aerosol particles was investigated using an entrained aerosol flow tube coupled to a custom-built chemical ionization mass spectrometer. Laboratory results on aqueous particles confirm a strong dependence of the reactive uptake coefficient (γ) on particle liquid water, for particle water concentrations below 15 M, and the molar ratio of particle water to nitrate. Measurements of &gamma; (N<sub>2</sub>O<sub>5</sub>) on mixed chloride-nitrate particles indicate that the presence of trace chloride can negate the suppression of γ(N<sub>2</sub>O<sub>5</sub>) at high nitrate loadings with implications for polluted coastal regions. These results are used to construct a new parameterization for &gamma; (N<sub>2</sub>O<sub>5</sub>), that when coupled to an aerosol thermodynamics model, can be used within regional and/or global chemical transport models.
Share - Bookmark