HR: 0800h
AN: A51C-0077    [Abstracts]
TI: Measurements of PAN and its Precursors in Seoul Metropolitan Area, Korea during May- June, 2004
AU: * Lee, G
EM: gwlee@san.hufs.ac.kr
AF: Hankuk University of Foreign Studies, Kyounggi-do, Yongin, 449-791 Korea, Republic of
AU: Ghim, Y
A51C-0077 AF: Hankuk University of Foreign Studies, Kyounggi-do, Yongin, 449-791 Korea, Republic of
AU: Lee, M
EM: meehye@korea.ac.kr
AF: Korea University, Anam-dong, Sungbuk-gu, Seoul, 136-701 Korea, Republic of
AU: Kim, K
EM: krkim@snu.ac.kr
AF: Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-742 Korea, Republic of
AU: Han, J
A51C-0077 AF: National Institute of Environmental Research, Seo-gu, Inchon, 404-708 Korea, Republic of
AU: Hong, Y
A51C-0077 AF: National Institute of Environmental Research, Seo-gu, Inchon, 404-708 Korea, Republic of
AB: Measurements of PAN, ozone and their main precursors, such as CO, NOx(NO + NO2), VOCs, and UV radiation were made at urban area of north central Seoul during the intensive photochemical monitoring program held in the May and June of 2004 at downtown of Seoul, Korea. Average mixing ratios of PAN were lied between 0.2 to 0.6 ppbv, with up to 10.5 ppbv in high ozone episode day. There were pronounced diurnal cycle with maximum in late afternoon. However, no significant degrees of correlation were found between PAN and ozone concentrations at this site except during the high ozone episode days. This inconsistency between these two photochemical species induced from common precursors, NOx and VOCs was mainly due to a direct effect of ozone titration by freshly emitted NO. On the other hand, good correlation was observed in daily maxima of PAN and Ozone. The measured levels of PAN in Seoul were considerably lower than those of other cities. The behaviors of PAN vs (NO/NOx) suggested that continuous and large amount of NO emission often kept the level of PAN low compared with measurements in other big cities.
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