[ACG58-P06] Variation of ultra fine particle concentrations within the winter boundary layer observed by a Multicopter UAV
Keywords:multicopter UAV, boundary layer, ultra fine particles, high tempo-spatial resolution
Similar variations were observed from sunrise to noon for all 4 days. High concentrations of UFP, exceed 10000 particles /cm3 appeared in surface layer and low concentrations of UFP, 2000-5000 particles/cm3, were observed in residual layers above surface layers at sunrise. Thickeness of surface layer with high concentration of UFP grew with time until around 11:00, and surface layer disappeared and concentration of UFP decreased at the time. Concentrations of UFP after 11:00 show different level, which seem to refrect the conditon of field located in upstream direction of surface wind. Lifetimes of UFP were estimated as around 5 hours, based on aerosol size distributions observed at Fukuoa University, and they are consistent with low concentration of UFP in resudual layer for all 4 days.