Comparison of simulated aerosol number size distribution with G-1 measurements on 7 March at different altitudes: (A) 650 m, (B) 1,900 m, (C) 3,200 m, (D) 4,500 m, and (E) 5,800 m. All aerosol size distributions are normalized to STP. The definitions of the model scenarios are provided in the section of Constraint from In Situ Measurements and in SI Appendix, Table S1. Details of the observational data are described in SI Appendix, section 3.