Characteristic number size distribution of aerosol during Asian dust period in Korea |
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| Institution: | 1. Applied Meteorology Research Department, Meteorological Research Institute, Seoul 156-720, South Korea;2. Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, South Korea;1. Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jungong Road, Shanghai 200093, China;2. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;1. NANOMISENE Laboratory LR16CRMN01, Center for Research on Microelectronics and Nanotechnology CRMN of Sousse, Technopark of Sousse, B.P 334, Sahloul, Sousse, Tunisia;2. University of Monastir, Faculty of Sciences of Monastir, Laboratoire des interfaces et des matériaux avancés (LIMA), 5019 Monastir, Tunisia;3. University Paris-Est, Laboratoire Physique des Matériaux Divisés et des Interfaces (LPMDI), UPEMLV, 77454 Marne-la Vallée, France |
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| Abstract: | The size-separated number concentrations of aerosols ranging from 0.3 to 25 μm were observed in Seoul and Anmyon Island in the west coast of Korea during Asian dust period in Spring 1998. During the heavy dust period, the number size distributions of aerosols observed in both places were characterized by decreases in small size<0.5 μm and increase in large size between 1.35 and 10 μm. For particles in this range, there was a good correlation between number concentrations observed in both two places. The number of coarse particles >10 μm showed a distinct diurnal variation without a significant change in amplitude, which was more pronounced in Seoul. It suggests that coarse particles were more affected by local sources. Trajectories back in time showed that the air collected in Korea during dust period originated from desert regions in the central part of China. From these results, it was evident that increased particles in the range of 1.35–10 μm during dust source period represented mineral components, which originated possibly from the dust source regions. |
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