| Year of Publication | 2013 | Division | Asian Dust Research Division |
|---|---|---|---|
| Title | PM10 data assimilation over south Korea to Asian dust forecasting model with the optimal interpolation method | ||
| Author | 이은희 | ||
| Coauthor | Jeong Eun Kim, Youngsin Chun | ||
| ISBN(ISSN) | Name of Journal | Asia-Pacific J. Atmos. Sci | |
| Category (International/Domestic) | 국내 | Vol. No. | 49(1) |
| Research Project Title | 황사 감시․예측기술 지원 및 활용연구(Ⅲ) | Publication Date | 2013-01-01 |
| Keywords | Hwangsa severe Asian dust winter dust spring dust chemical characteristics of Asian dust | ||
This study investigated meteorological, physical, and chemical characteristics of 2 severe Hwangsa (Asian dust, maximum average of PM10 above 1000 μg m−3) observed in Seoul, the capital city of Korea, during 30∼31st May, 2008 (DSS2008) and 25∼26th December, 2009 (DSS2009). DSS2008 and DSS2009 had a same source region and route. However, they have different meteorological conditions. DSS2009 had a shorter travel time from the source region to Korea and shorter duration time in Korea than DSS2008 due to a strong winter Siberian anticyclone. One of DSS2008 sample was affected by not only Asian dust but also a long-range transported haze due to consecutive influx after low pressure passed while DSS2009 sample collected only dust aerosol. For both cases, the mass concentration of coarse particles (PM10-1) increased by 3∼14 times compared to that during non Asian dust period, however, that of fine particles (PM1) increased only in DSS2008. For DSS2008 water-soluble ion balance between anions and cations in fine mode was close to 1:1 while cations were higher than anions in coarse mode. NH4+ and Ca2+ were found to be the main contributing factors for the neutralization. Cl− loss was observed about 60% indicating an active interaction of Na+ with pollutants. Reconstruction of chemical compositions showed relatively high concentrations of secondary pollutants (NH4NO3 and (NH4)2SO4), CaCO3, and Ca(NO3)2 compared to that during non Asian dust period. DSS2009 exhibited the typical characteristics of Asian dust having a high concentration of Ca2+ with higher equivalent concentration of cations than anions in all size bins. Cl− loss was hardly observed. The secondary pollutants were lower than that of non Asian dust cases. The result of reconstruction of ionic components indicated the CaCO3 derived from soil particle, CaSO4, and Ca (NO3)2 were dominant in DSS2009
