春季の瀬戸内海沿岸部における大気エアロゾルの化学的特徴

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Chemical composition of aerosols and the particle number densities were measured continuously in the coastal area of Seto Inland Sea in spring. Outflows of anthropogenic substances and Kosa were observed and the mean concentrations of nss (non sea salt) SO42-, NH4+, NO3-, nss-Ca2+ were 4.70, 1.41, 1.15 and 0.20 ?g m-3, respectively. NH4+ and nss-Ca2+ were used to neutralize nss-SO42- and NO3-. This Kosa event and fixed nitrogen supply to the sea surface causes high biological activity from late spring to summer. Dry deposition fluxes of particulate NH4+ and NO3- were estimated in order to assess the effect of atmospheric inorganic nitrogen supply to the surface ocean. Based on the atmospheric concentrations and the area of Seto Inland Sea (23,000km2), the deposition fluxes of particulate NH4+ and NO3- were 2 and 3 Gg N/year, respectively.
2013-06-00