Contributions of long-range transported and locally emitted nitrate in size-segregated aerosols in Japan at Kyushu and Okinawa
Contributions of long-range transported and locally emitted nitrate in size-segregated aerosols in Japan at Kyushu and Okinawa
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日本九州和冲绳的尺寸分离气溶胶中远距离迁移和局部排放的硝酸盐的贡献
DOI：
10.4209/aaqr.2016.12.0587
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发表时间：
2017
影响因子：
4
通讯作者：
S. Hatakeyama
中科院分区：
文献类型：
--
作者：
Shiori Tatsuta;Kojiro Shimada;C. Chan;Y. Kim;N. Lin;A. Takami;S. Hatakeyama
摘要我们观测了2012年至2015年期间在熊本县（KM）城市站点和冲绳县（HD）鹤都角（Cape Hedo）农村站点收集的气溶胶中质量浓度、离子组成和痕量金属浓度的粒度分布。为了评估熊本气溶胶中跨界硝酸盐和本地排放的硝酸盐的贡献，我们根据Pb浓度的阈值和Pb（在0.5 <投影面积直径（Dp）< 1.0 µm）/Cu（在2.5 < Dp < 10 µm）的比值区分了东亚跨界空气污染的天数和本地空气污染的天数。细硝酸盐（颗粒NH 4 NO3）没有到达HD从亚洲大陆，即使在长距离运输条件下。在熊本及其附近地区排放的细硝酸盐也没有被输送到HD，即使是在一个空气质量，通过KM，并在一天内达到HD。几乎所有的细硝酸盐转化为粗硝酸盐在运输过程中分解细硝酸盐和吸附HNO 3上较大的气溶胶颗粒。跨界硝酸盐主要存在于0.5 < Dp < 10 µm的粒径范围内，即使在远距离传输条件下，0.1 < Dp < 0.5 µm粒径范围内的跨界硝酸盐的贡献也约为20%。在春季、秋季和冬季，KM处Dp < 2.5 µm的颗粒物中跨界硝酸盐的贡献分别约为50%、50%和80%。
ABSTRACTWe observed the size distributions of mass concentration, ionic composition, and trace metal concentration in aerosols collected at an urban site in Kumamoto Prefecture (KM) and a rural site at Cape Hedo in Okinawa Prefecture (HD) between 2012 and 2015. To evaluate the contribution of transboundary nitrate and locally emitted nitrate in the aerosols at Kumamoto, we distinguished between days of transboundary air pollution from East Asia and days of local air pollution on the basis of a threshold for Pb concentration and the ratio Pb (in 0.5 < projected area diameter (Dp) < 1.0 µm)/Cu (in 2.5 < Dp < 10 µm). Fine nitrate (particulate NH4NO3) did not arrive at HD from the Asian continent even under long-range transport conditions. Fine nitrate emitted in Kumamoto and its vicinity also was not transported to HD, even in an air mass that passed over KM and reached HD within one day. Almost all fine nitrate was converted to coarse nitrate during transport by dissociation of fine nitrate and adsorption of HNO3 on larger aerosol particles. Transboundary nitrate existed largely in the particle size range of 0.5 < Dp < 10 µm, and the contribution of transboundary nitrate in the particle size range of 0.1 < Dp < 0.5 µm was about 20% even under long-range transport conditions. The contribution of transboundary nitrate in particles with Dp < 2.5 µm at KM was approximately 50%, 50%, and 80% in spring, autumn, and winter, respectively.
影响因子：
5.2
作者：
S. Itahashi;K. Yumimoto;I. Uno;K. Eguchi;T. Takemura;Y. Hara;A. Shimizu;N. Sugimoto;Zhaoyan Liu
通讯作者：
S. Itahashi;K. Yumimoto;I. Uno;K. Eguchi;T. Takemura;Y. Hara;A. Shimizu;N. Sugimoto;Zhaoyan Liu