エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
研究論文
東アジアから辺戸に輸送されたエアロゾルの粒径別化学成分濃度とその輸送中の変質機構
湯本 弥生島田 幸治郎荒木 優志吉野 彩子高見 昭憲畠山 史郎
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2015 年 30 巻 2 号 p. 115-125

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In order to investigate the processes of chemical transformations of aerosol transported from East Asia to Japan the concentrations of ionic species in size-segregated aerosols were measured in Cape Hedo, Okinawa, Japan. By use of a cascade impactor (Nano sampler) we collected aerosols at 5 stages. Throughout the observation periods, species originated from anthropogenic sources such as NH4 and nss-SO42- were dominant in fine mode particles (0.1–0.5 μm, 0.5–1 μm), whereas species originated from natural sources such as Na and
Cl- were dominant in coarse mode particles (2.5–10μm, >10μm). The (Cl-+NO3-)/Na ratio in coarse mode, 1.14 in equivalent basis, was very close to Cl-/Na of sea water (1.17), which indicated that NH4NO3 was decomposed to gaseous NH3 and HNO3 during the long-range transport, and HNO3 deposited on sea-salt particles. The concentrations of NH4, nss-SO42- and nss-K in fine mode were higher during high pressure episodes; it suggests that the fine particles emitted from anthropogenic sources (e.g. biomass burning) were transported with a migratory anticyclone. Increase of nss-Ca2+ and nss-SO42- in coarse mode during Asian dust episode implied that surface reactions with gaseous species on CaCO3 particles occurred during the transport.


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© 2015 日本エアロゾル学会
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