HR: 0800h
AN: A51C-0076    [Abstracts]
TI: Hydrogen Peroxide During Ozone Episodes in Seoul Metropolitan Area
AU: * Lee, M
EM: meehye@korea.ac.kr
AF: Korea University, Anam-dong, Sungbuk-gu, Seoul, 136-701 Korea, Republic of
AU: Lee, G
EM: gwlee@san.hufs.ac.kr
AF: Hankuk University for Foreign Studies, Kyounggi-do, Yong-In, 449-791 Korea, Republic of
AU: Han, J
A51C-0076 AF: National Institute of Environmental Research, Seo-gu, Inchon, 404-708 Korea, Republic of
AU: Lee, S
A51C-0076 AF: National Institute of Environmental Research, Seo-gu, Inchon, 404-708 Korea, Republic of
AB: The national air quality standard for ozone is 1-hour average of 120 ppbv. In Seoul, it is most frequent in June the peak concentrations of ozone exceeded 120 ppbv. To understand the photochemical ozone production in Seoul, intensive measurements were made in the northeastern part of Seoul during May-June, 2004. Together with ozone and its precursors, H2O2 and other radical precursors such as formaldehyde and HONO were measured. During the whole course of experiment, we encountered several high ozone episodes over 120 ppbv and observed H2O2 concentrations up to 6 ppbv. In general, H2O2 variations showed a maximum in the late afternoon. However, high levels of H2O2 were occasionally detected in the morning or in the evening. With measurement results of other species, it suggests that radical sources other than ozone, for example HONO or the reaction of alkenes with ozone, possibly played a role in the formation of H2O2 in Seoul metropolitan air. Detailed results will be presented in the meeting.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005