JATOP夏季調査における粒子状/ガス状成分の測定に関する研究

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In order to understand the behavior of fine particles (FP; less than 2.5 μm) in the atmosphere, a better characterization and measurement of their components in equilibrium with their corresponding gaseous compounds are necessary. We focused on a little studied chemical composition of size-resolved suburban aerosol and its diurnal variation. From 28 July to 11 August 2008, we measured high-time resolved aerosol composition with an aerosol mass spectrometer (AMS) at Saitama city, a suburban area of Tokyo. Equilibrium of gaseous nitric acid with particulate nitrate was evaluated using an annular denuder and filter pack (AD-FP) system with a time resolution of 3 hours for the AD-FP. Sulfate and organics were the major components of non-refractory aerosols (NR-PM1), while nitrate and chloride concentrations were relatively low. Size distributions of sulfate, ammonium, and organics showed mainly unimodal characteristics, suggesting internally mixed aerosol.Nonetheless organics showed bimodal characteristics in the rush hours or stagnant condition. Sulfate and　oxygenated organic aerosols (OOA) increased mainly in the daytime along with transportation of air masses from　polluted areas, however, OOA increased mainly under stagnant conditions. These results showed an important　effect with the polluted air mass transported from urban areas in addition to the local effect on suburban aerosols.
埼玉大学総合研究機構地域オープンイノベーションセンターの論文

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