Abstract
The high tropospheric O3 concentration was observed in 8th-12th May, 2009 in Yakushima Is. In order to evaluate the atmospheric pollutant long-range transport and its origin, O3 and particulate matter samples was collected during 9th to 12th May, 2009 in Yakushima Is. The back trajectory analysis indicate that the variation of O3 concentration was related to the air mass passing rout. In other words, the high O3 concentration was observed when the air mass comes from the Asian continent and the low concentration of O3 was observed when the air mass comes from the Pacific Ocean. It suggested that the origin of high concentration of O3 were the NOX and VOCs which is emitted from the China continent. These chemicals were changed into O3 by the photo chemical reaction in the atmosphere during the long-range transport process to Yakushima Is. In particulate matter, relationship between NO3-, nss-SO42- were observed in small particle of PM1.0-2.5 and 1μm>PM fraction. On the other hand, correlation was not observed in PM1.0-2.5 fraction. The high correlation was observed between Fe and Al in PM2.5-10 fraction and the ratio (0.6) shows the same as the Asian dust. This result suggests that the PMc fraction may originate from the natural source in China continent, and the PM1.0-2.5 and 1μm> fraction is originated from the anthropogenic source.
