Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride
Other literature type
Bertram, T. H.
Thornton, J. A.
(issn: 1680-7324, eissn: 1680-7324)
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 γ (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 γ (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.