Important role of ammonia on haze formation in Shanghai
Important role of ammonia on haze formation in Shanghai
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DOI：
10.1088/1748-9326/6/2/024019
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发表时间：
2011-06
影响因子：
6.7
通讯作者：
X. Ye;Zhen Ma;Jiachen Zhang;Huanhuan Du;Jianmin Chen;Hui Chen;Xin Yang;Wei Gao;F. Geng
中科院分区：
文献类型：
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作者：
X. Ye;Zhen Ma;Jiachen Zhang;Huanhuan Du;Jianmin Chen;Hui Chen;Xin Yang;Wei Gao;F. Geng
2009年9月12日，上海发生了一次雾霾事件，PM1.0/PM2.5 （PM：颗粒物）质量比达到0.8。艾特肯模式粒子和累积模式粒子吸湿性生长因子分布的变化相似，表明细颗粒物的增强是由局地大气加工引起的。吸湿性测量与化学分析相结合，有力地支持了（NH4）2SO4和NH4NO3对霾事件的显著贡献。[NH4 +]/([NO3−]+ 2[SO42−])的摩尔比上升至0.96，与NH3浓度的大幅增加一致，表明有效NH3在雾霾期间对颗粒物硫酸盐和硝酸盐的增强起着至关重要的作用。
A haze episode occurred on 12 September 2009 in Shanghai, when the mass ratio of PM1.0/PM2.5 (PM: particulate matter) reached 0.8. A similar variation of hygroscopic growth factor distribution was observed for Aitken mode particles and accumulation mode particles, implying that the enhancement of fine particles was caused by local atmospheric processing. The hygroscopicity measurements in combination with chemical analysis provided strong support for the significant contribution of (NH4)2SO4 and NH4NO3 to the haze episode. The molar ratio of [NH4 + ]/([NO3 − ] + 2[SO42 − ]) rose up to 0.96, coincident with the large increase in NH3 concentration, suggesting that the available NH3 played a vital role in the enhancement of particulate sulfate and nitrate during the haze episode.