Figure 7 Map showing the spatial distributions of (a) sulfate mass concentrations at the surface, (b) sulfate mass concentrations at 2.6 km altitude, and wind field at 16:00 local time on 28 July from WRF-Chem results. The contribution of (c) chemical production process (d) advection transport process on the vertical cross section of sulfate during the period with the warm front. The vertical speed of in-plane wind vectors (arrows) was multiplied by a factor of 1800, and planetary boundary layer height was shown as the black solid line. The black solid line in panel (a) denotes the location of the vertical cross section shown in panel (c) and (d).
3.3 Evolution of aerosol chemistry during the regional transport