Modeling study of the potential importance of heterogeneous surface reactions for NOx transformations in plumes

A parametric model of gas-particle surface reactions is incorporated into a reactive plume model and used to assess the potential importance of heterogeneous surface reactions on gas phase plume chemistry. Heterogeneous loss of the following species is found to be potentially significant: H₂O₂, PAN, NO₃, N₂O₅, OH, HO₂ and in cold weather HO₂NO₂. This simple model is unable to account for equilibrium/capacity effects in the condensed phase and therefore cannot be used for SO₂ and HNO₃ reaction with aerosol surface.