1-km and 333-m configuration plume cross sections. Vertical cross-sections of crosswind-integrated plume concentrations (14-km wide transect), as function of height above mean sea level (MSL) and distance downwind from source, at 1800 UTC (=1300 LST) for the 1-km mesoscale domain (left) and 333-m mesoscale domain (right). Integrated concentrations are normalized by Q/(Uz_i), where Q is mean wind speed, and z_i is mixed layer height. Concentration contours are shown in logarithmic intervals with adjacent colors representing a factor of two difference. Horizontal distance is given both in km and in units of x₀ = Uz_i/w_*, where w_* is the convective velocity scale, as defined in text. DOI: https://doi.org/10.1525/elementa.247.f9