Meteorological Characteristics and Assessment of the Effect of Local Emissions during High PM10Concentration in the Seoul Metropolitan Area

Autor: Park, Il-Soo, Kim, Hyeon-Kook, Song, Chang-Keun, Jang, Yu-Woon, Kim, Sang-Heon, Cho, Chang-Rae, Owen, Jeffrey S., Kim, Cheol-Hee, Chung, Kyung-Won, Park, Moon-Soo
Zdroj: Asian Journal of Atmospheric Environment; June 2019, Vol. 13 Issue: 2 p117-135, 19p
Abstrakt: In this study, we investigate the meteorological characteristics and the effect of local emissions during high PM10concentrations in the Seoul Metropolitan Area (SMA) by utilizing data from a high-resolution urban meteorological observation system network (UMS-Seoul) and The Air Pollution Model (TAPM). For a detailed analysis, days with PM10concentrations higher than 80 µg m-3for daily average PM10concentration (classified as unhealthy by the Korean Ministry of Environment) in the Seoul Metropolitan Area (SMA) were classified into 3 Cases. Case I was defined as when the prevailing effect was from outside the SMA. Case II was defined as when the prevailing effect was a local effect with outside. Case III was defined as when the prevailing effect was local. Overall, high PM10concentrations in the SMA mostly occurred under weak migratory anticyclone systems over the Korean Peninsula during warm temperatures. Prior to the PM10concentration reaching the peak concentration, the pattern in each case was distinctive. After peak concentrations, however, the pattern for the 3 cases became less distinct. This study showed that nearly 50% of the high PM10concentrations in the SMA occurred in spring and were governed by the conditions for Case II more than these for Cases I and III. In spring, the main sources of the high PM10concentrations in the SMA were local emissions due to the predominance of weak winds and local circulation. The simulation showed that the non-SMA emissions were about 63 to 73% contribution to the spring high PM10concentrations in the SMA. Specifically, local point sources including industrial combustion, electric utility, incineration and cement production facilities scattered around the SMA and could account for PM10concentrations more than 10µg m-3in the SMA.
Databáze: Supplemental Index
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