Meteorological effects on the evolution of high ozone episodes in the greater Seoul area.
Three high O{sub 3} episodes - 7 days in 1992 (July 3-July 9), 9 days in 1994 (July 21-July 29), and another 3 days in 1994 (August 22-August 24) - were selected on the basis of morning (7:00 a.m.-10:00 a.m.) average wind direction and speed and daily maximum O{sub 3} concentrations in the greater Seoul, Korea, of 1990-1997. To better understand their characteristics and life cycles, surface data from the Seoul Weather Station (SWS) and surface and 850-hPa wind field data covering northeast Asia around the Korean Peninsula were used for the analysis. In the July 1992 episode, westerly winds were most frequent as a result of the influence of a high-pressure system west of the Korean Peninsula behind a trough. In contrast, in the July 1994 episode, easterly winds were most frequent as a result of the effect of a typhoon moving north from the south of Japan. Despite different prevailing wind directions, the peak O{sub 3} concentrations for each episode occurred when a sea/land breeze developed in association with weak synoptic forcing. The August 1994 episode, which was selected as being representative of calm conditions, was another typical example in which a well-developed sea/land breeze helped cause the peak O{sub 3} concentration to rise to a record high of 322 parts per billion by volume (ppbv). All three high O3 episodes ended as a result of precipitation, and subsequent rises in O3 concentrations were also suppressed by a series of precipitation events afterwards. In particular, two heavy rainfalls were the main reason why the August 1994 episode, which had the highest and second-highest O{sub 3} concentrations, lasted only a few days.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- USDOE; FOR
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942793
- Report Number(s):
- ANL/EA/JA-34660
- Journal Information:
- J. Air Waste Manage. Assoc., Journal Name: J. Air Waste Manage. Assoc. Journal Issue: 2 ; Feb. 2001 Vol. 51; ISSN JAWAEB; ISSN 1047-3289
- Country of Publication:
- United States
- Language:
- ENGLISH
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