论文部分内容阅读
In this study the spatiotemporal distribution and chemical composition of atmospheric fine particles in areas around the Taiwan Strait were investigated.Fine particles (PM2.5) were simultaneously collected at two cities in Fujian province (Xiamen and Fuzhou) on the west-side of the Taiwan Strait and three cities (Kaohsiung, Taichung and Taipei) and an offshore island (Penghu Island) on the east-side of the Taiwan Strait in 2013-2014.The field sampling results indicated that the average PM2.5 concentrations at the west-side sampling sites were generally higher than those at the east-side sampling sites.After sampling, the PM2.5 samples were analyzed for their chemical composition, including water-soluble ions, metallic elements, and carbonaceous content.The most abundant water-soluble ionic species of PM2.5 are SO42-, NO3-, and NH4+, suggesting that PM2.5 is mainly composed of secondary ammonium sulfate and ammonium nitrate.Although natural crustal elements dominated the metallic content of PM2.5, the most abundant anthropogenic metals of PM2.5 were Zn, Pb, Mn and Cu.The concentrations of Zn and Pb at the west-side sampling sites were consistently higher than those at the east-side sites.Moreover, the OC concentration of PM2.5 was generally higher than that of EC.The sulfur and nitrogen oxidation ratios (SOR and NOR) were generally higher than 0.25 and 0.10, respectively, suggesting that aged secondary sulfate and nitrate aerosols came mainly from cross-boundary transportation.