抄録
Atmospheric fine aerosol measurement campaign was performed in the summer of 2013 in Kanto area, Japan. In this paper, approaches to source apportionment of the PM2.5 by Positive Matrix Factorization (PMF) are described. Data used for PMF analysis is a chemical analysis data (organic and elemental carbon, ionic species, and elemental composition) of the PM2.5. Sampling of the PM2.5 was undertaken at three sites of Kudan (Tokyo Metropolitan), Kazo (Saitama Prefecture) and Maebashi (Gunma Prefecture) in Kanto area. Based on the PMF analysis at the three sites, the contributions of the following six sources were estimated; local soil (percentage source contribution of three sites average: 9.7%), mobile sources (21.2%), smoke sources (5.7%), biomass burning (19.5%), secondary nitrate (11.9%), and secondary sulfate (31.9%). The concentrations of secondary sulfate seemed to vary with the two-day cycle rather than the one-day cycle at the three sites. The concentrations of secondary nitrate showed diurnal variation with the minimum in the daytime. On the other hand, the particles concentrations with biomass burning and mobile sources unlike the secondary nitrate was higher during the daytime.
