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http://dx.doi.org/10.5572/KOSAE.2012.28.3.325

Quantitative Estimation of Precipitation Scavenging and Wind Dispersion Contributions for PM10 and NO2 Using Long-term Air and Weather Monitoring Database during 2000~2009 in Korea  

Lim, Deuk-Yong (Department of Environmental Science and Engineering, College of Engineering, Kyung Hee University)
Lee, Tae-Jung (Department of Environmental Science and Engineering, College of Engineering, Kyung Hee University)
Kim, Dong-Sool (Department of Environmental Science and Engineering, College of Engineering, Kyung Hee University)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.28, no.3, 2012 , pp. 325-347 More about this Journal
Abstract
Long-term air and weather data monitored during the period of 2000 to 2009 were analyzed to quantitatively estimate the precipitation scavenging and wind dispersion contributions of ambient $PM_{10}$ and $NO_2$ in Korea. Both air pollutants and meteorological data had been respectively collected from 120 stations by the Ministry of Environment and from 20 weather stations by the Korea Meteorological Administrations in all parts of Korea. To stochastically identify the relation between a meteorological factor and an air pollutant, we initially defined the SR (scavenging ratio) and the DR (dispersion ratio) to separately calculate the precipitation and wind speed effects on the removal of a specific air pollutant. We could then estimate the OSC (overall scavenging contribution) and the ODC (overall dispersion contribution) with considering sectoral precipitation and wind speed probability density distributions independently. In this study, the SRs for both $PM_{10}$ and $NO_2$ were generally increased with increasing the amounts of precipitation and then the OSCs for $PM_{10}$ and $NO_2$ were estimated by 22.3% and 15.7% on an average in Korea, respectively. However, the trend of the DR was quite different from that of SR. The DR for $PM_{10}$ was increased with increasing wind speed up to 2.5 m/s and further the DR for $NO_2$ showed a minimum in the range of $1<WS{\leq}1.5$. The ODCs for $PM_{10}$ and $NO_2$ were estimated by 14.9% and 1.0% in Korea, respectively. Finally, we have also provided an interesting case study observed in Seoul.
Keywords
Wet deposition; Scavenging contribution; Dispersion contribution; $PM_{10}$; $NO_2$;
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