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KMID : 1024520140230020249
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Journal of the Environmental Sciences
2014 Volume.23 No. 2 p.249 ~ p.259
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Numerical Study on the Characteristics of High PM2.5 Episodes in Anmyeondo Area in 2009
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Jeon Won-Bae
Lee Hwa-Woon
Lee Soon-Hwan
Park Jae-Hyeong
Kim Hyun-Goo
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Abstract
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This paper investigates the characteristics of high PM2.5 episodes occurred at Anmyeondo area in spring time, 2009. The
monthly mean PM2.5 concentration during April was the highest in the year and especially, high levels of PM2.5 exceeding standard regulation level were sustained consecutively during 5 to 13 April. To analyze more detailed PM2.5 characteristics,numerical simulations were carried out using CMAQ(Community Multi-scale Air Quality) with IPR(Integrated Process Rate)and DDM-3D(Decoupled Direct Method). PM2.5 level was lower in daytime than that in nighttime due to vigorous vertical mixing during daytime. The chemical composition was showed that ratio of primary ion components such as sulfate(SO42-),nitrate(NO3-) and ammonium(NH4+) were nearly half of total amount of PM2.5. Aerosol and transport process dominantly contributed to PM2.5 concentration in Anmyeondo area and contribution rate of local emissions was nearly zero since Anmyeondo area has rare anthropogenic PM emission sources. DDM-3D analysis result showed that PM2.5 in Anmyeondo area was influenced by emissions from Shanghai and Shandong region of China.
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KEYWORD
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PM2.5, CMAQ, DDM, Coastal region
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