HR: 1340h
AN: A13A-0872    [Abstracts]
TI: Observation of ultrafine particle events in urban Gwangju, Korea
AU: * Park, K
EM: kpark@gist.ac.kr
AF: Gwangju Institute of Science and Technology, Department of Environmental Science and Engineering, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AU: Park, J
EM: wldusl7214@gist.ac.kr
AF: Gwangju Institute of Science and Technology, Department of Environmental Science and Engineering, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AU: Kwak, J
EM: kkjh5950@gist.ac.kr
AF: Gwangju Institute of Science and Technology, Department of Environmental Science and Engineering, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AB: Three types of ultrafine particle events (10-100 nm traffic event, 50-100 nm residential heating event, and 10-30 nm photochemical event) in the Gwangju (Korea) ambient atmosphere were reported. We occasionally observed particle growth after formation of particles larger than 10 nm in the 10-30 nm photochemical event with growth rates of 2.2 nm/hr - 4.7 nm/hr. We showed distinct seasonal and diurnal patterns of ultrafine particle concentration. In winter, the N (50-80 nm), probably due to traffics and residential heating, led to the increased ultrafine particles, while in summer N (10-30 nm) formed by photochemical activity led to the enhanced concentration of ultrafine particles. We found that ultrafine particle concentrations observed in the morning (6:00- 11:00) and evening (17:00-23:00) was correlated with NOx. Although we observed enhanced SO2 concentration in the photochemical event, in general there was not a clear association between N (3-100 nm) and SO2. TEM and EDS analyses for mobility size-selected particles during ultrafine particle events showed that sulfate mixtures with metals and carbonaceous particles were included in the photochemical event, and non-spherical (agglomerated) carbonaceous particles were often observed in the traffic event.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting