著者

中村 篤博 成田 祥 金澤 啓三 植松 光夫

出版者

日本エアロゾル学会

雑誌

エアロゾル研究 (ISSN:09122834)

巻号頁・発行日

vol.32, no.1, pp.4-13, 2017-03-20 (Released:2017-04-03)

参考文献数

30

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Chemical compositions and particle number densities of atmospheric aerosols were measured continuously in the coastal area of Seto Inland Sea during the spring of 2015. The mean concentrations of NH4+, NO3-, and water soluble organic nitrogen (ONws) were 1.6, 0.85, and 0.28 μg N m-3, respectively in total sampling mode. NO3- existed in both fine and coarse modes, while NH4+ and ONws existed primarily in fine mode. On the days of normal atmospheric conditions, the amount of ONws contributing to the total nitrogen was about 14% N in both fine and coarse sampling modes. This ratio was equivalent to the amount of NO3- content in fine mode and NH4+ in coarse mode. On the days with polluted atmospheric conditions, the amount of ONws contributing to total nitrogen was about 9.3% N in fine mode and about 5.0% N in coarse mode. This ratio was equivalent to the contributions of NO3- in fine mode and NH4+ in coarse mode. Dry deposition fluxes of particulate NH4+, NO3-, and ONWS in the area were 280, 660, and 83 μg N m-2 day-1, respectively. The flux of NO3- was more effective than any other nitrogen compounds, since the deposition rate depends upon a size distribution. The dry deposition of ONws accounted for about 8.1% of the total nitrogen dry deposition. Thus, ONWS cannot be ignored when considering the nitrogen budget and cycles in this area.