Vertical profiles of aerosol, NO2, H2O and HONO in Hefei and its surrounding agricultural fields

Average aerosol vertical profiles exhibited a Gaussian shape above 100 m with maximum values of 0.67 km^-1 and 0.55 km^-1 at 300-400 m layer at AHU and CF, respectively. The distinct layered structure mainly attributed to regional transport. Average H₂O and NO₂ vertical profiles all showed a Gaussian shape and an exponential shape at AHU and CF, respectively. Moreover, the diurnal evolution of H₂O profiles performed one peak and bi-peak patterns at AHU and CF, respectively, whereas NO₂ at two stations all exhibited bi-peak patterns attributed to vehicle emissions. Average HONO vertical profiles showed an exponential shape and a Gaussian shape at AHU and CF, respectively. Higher HONO (> 0.05 ppb) above 1.0 km at 14:00-16:00 was observed at CF.