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Long-lasting outflow of dust and pollutants was observed over Japan during 26 May and 2 June by various aerosol measurements, such as groud-based lidar, space-born lidar, Polarization Optical Particle... Counter (POPC) and automated aerosol sampler at Fukuoka. Regional numerical chemical transport model was applied for this event to clarify meteorological situation and the transport structure of continuous aerosol plume. Two sequential dust outbreaks by low pressure system produced long-lasting dust plumes, and subsequently generated blocking high pressure system over East China Sea capped air pollutants over Japan. High particulate matter (PM) concentration was continuing about 1 week, the daily average PM2.5 was larger than 35 μg/m^3, and PM10 also exceeded 100μg/m^3 from 27 May to 2 June at Fukuoka. Averaged depolarization ratio derived from ground based lidar and POPC at 0.5 μm were 0.11 and 0.146 respectively. These values are relatively low for dust case, because depolarization ratio for pure dust events is generally lager than 0.2. Furthermore, observed coarse mode nitrate during this event was very high, these results suggested that the internal mixing of spherical aerosol on dust particles might be occurred.続きを見る
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