Hygroscopic growth of urban aerosol particles during the 2009 Mirage-Shanghai Campaign

Hygroscopic growth of urban aerosol particles during the 2009 Mirage-Shanghai Campaign
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2009年幻影-上海战役期间城市气溶胶颗粒的吸湿生长

DOI:
10.1016/j.atmosenv.2012.09.064
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发表时间:
2013
影响因子:
5
通讯作者:
Geng, Fuhai
Geng, Fuhai
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Ye, Xingnan;Tang, Chen;Yin, Zi;Chen, Jianmin;Ma, Zhen;Kong, Lingdong;Yang, Xin;Gao, Wei;Geng, Fuhai

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在2009年的幻影-上海行动中,我们研究了亚微米城市气溶胶粒子的吸湿特性。城市气溶胶是由吸湿性较强和接近疏水性的颗粒以及少量吸湿性较低的颗粒组成的。多吸湿模式的平均吸湿性参数κ随颗粒大小在0.27-0.39范围内变化。吸湿性较强的颗粒在任何尺寸下的相对丰度约为70%,随着颗粒尺寸的增大而略有增加。近疏水颗粒物的数量比例每天在0.1~0.4之间波动,与交通排放和大气扩散一致。相对湿度对吸湿生长和细颗粒化学分析的结果表明,在夏季缺氨大气中,颗粒物通过均相气相反应生成的硝酸盐受到抑制,而在不利的气象条件下,更多的有效NH3打破了这种平衡。
The hygroscopic properties of submicrometer urban aerosol particles were studied during the 2009 Mirage-Shanghai Campaign. The urban aerosols were composed of more-hygroscopic and nearly-hydrophobic particles, together with a trace of less-hygroscopic particles. The mean hygroscopicity parameter κ of the more-hygroscopic mode varied in the range of 0.27–0.39 depending on particle size. The relative abundance of the more-hygroscopic particles at any size was ca. 70%, slightly increasing with particle size. The number fraction of the nearly-hydrophobic particles fluctuated between 0.1 and 0.4 daily, in accordance with traffic emissions and atmospheric diffusion. The results from relative humidity dependence on hygroscopic growth and chemical analysis of fine particles indicated that particulate nitrate formation through the homogenous gas-phase reaction was suppressed under ammonia-deficient atmosphere in summer whereas the equilibrium was broken by more available NH3during adverse meteorological conditions.
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