1. Simulated species SO 2, SO 4, DMS NH 3, NH 4, NH 4 NO 3 OC (hydrophobic, hydrophilic) BC (hydrophobic, hydrophilic) Sea-salt (4 bins) SOA same as Phil interactive oxidants

2. SOA Use the mass-based stoichiometric coefficients for the 2-product approach Linked to full mechanism only reactionfractionreference C10H16+O31.Chung and Seinfeld C10H16+OH1.Chung and Seinfeld C10H16+NO31.Chung and Seinfeld TOL+OH0.7Odum et al TOL(m-xyl)+OH0.2Cocker et al BIGALK+OH0.1Odum et al

3. Ammonium nitrate Based on Seinfeld and Metzger et al. Separate treatment of crystalline and aqueous state through deliquescence relative humidity NH4 is firstly used to create ammonium sulfate (sulfate neutral, rich and very rich states). What is left is used to create ammonium nitrate Calculation of ammonium nitrate is through an equilibrium calculation (equilibrium constant dependent on the solution molality and activity)

4. Uptake on aerosols Assume log-normal distribution of sulfate, soot and organic (organic carbon and SOA) aerosols, with different parameters No uptake on dust N2O5 -> 2 HNO3 NO3 -> HNO3 NO2 -> 0.5 (OH+NO+HNO3) HO2 -> 0.5 H2O2?

7. Ammonium nitrate Single-solute molality and activity coefficient parameterized using Metzger et al. (2002): polynomial approximations dependent on relative humidity H2SO4 is calculated diagnostically (not transported) Nitric acid is updated by the amount of nitrate formed