Evolution of secondary inorganic and organic aerosols during transport: A case study at a regional receptor site.
Evolution of secondary inorganic and organic aerosols during transport: A case study at a regional receptor site.
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DOI：
10.1016/j.envpol.2016.08.003
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发表时间：
2016-11
影响因子：
8.9
通讯作者：
Jianfei Peng;Min Hu;Z. Gong;Xu-dong Tian;Ming Wang;Jing Zheng;Qingfeng Guo;W. Cao;Wei Lv;Weiwei Hu;Zhijun Wu;Song Guo
中科院分区：
文献类型：
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作者：
Jianfei Peng;Min Hu;Z. Gong;Xu-dong Tian;Ming Wang;Jing Zheng;Qingfeng Guo;W. Cao;Wei Lv;Weiwei Hu;Zhijun Wu;Song Guo
在全球气候模拟中，了解大气中气溶胶的演变对于改善空气质量和减少与气溶胶相关的不确定性具有重要意义。这里，作为大气气溶胶输送过程中老化过程的个例研究，研究了位于东中国海附近的一个区域接收站的一次独特的灰霾事件。观察到光化学年龄从5小时增加到超过25小时，并且拟合的平均颗粒直径从70纳米逐渐增加到大约300纳米。根据污染特征和所涉及的气象条件，确定了污染累积(PA)、海风(SB)和陆风(LB)三个时期。当气团经过附近的城市台州时，黑碳(BC)、碳氢化合物类有机气溶胶(HOA)、半挥发性氧化有机气溶胶(SV-OOA)和硝酸盐的浓度增加了7倍至39倍。此外，城市出水羽流中的气溶胶成分以硝酸盐和SV-OOA为主(分别为52%和18%)，但在输送过程中它们的浓度逐渐下降。相比之下，硫酸盐和低挥发性氧化有机气溶胶(LV-OOA)表现出更多的地区性足迹，并可能具有相似的形成机制。原子氧碳比(O/C)也从0.45增加到0.9，这表明在输送过程中迅速形成了高度氧化的二次有机气溶胶(SOA)。总体而言，这些结果为了解运输过程中气溶胶污染的化学和物理特征的演变提供了有价值的见解，并强调了需要对氮氧化物、二氧化硫和挥发性有机化合物进行监管控制，以在不同的尺度上改善空气质量。
Understanding the evolution of aerosols in the atmosphere is of great importance for improving air quality and reducing aerosol-related uncertainties in global climate simulations. Here, a unique haze episode at a regional receptor site near the East China Sea was examined as a case study of the aging process of atmospheric aerosols during transport. An increase in photochemical age from 5 h to more than 25 h and a progressive increase in the fitted mean particle diameter from 70 nm to approximately 300 nm were observed. According to the pollution features and meteorology conditions involved, pollution accumulation (PA), sea breeze (SB), and land breeze (LB) periods were identified. Concentrations of black carbon (BC), hydrocarbon-like organic aerosols (HOA), semi-volatile oxidized organic aerosols (SV-OOA), and nitrate increased by 7-fold up to 39-fold when the air masses passed through Taizhou, a nearby city. In addition, nitrate and SV-OOA dominated the aerosol composition in the urban outflow plumes (52% and 18%, respectively), yet they gradually decreased in concentration during transport. In contrast, sulfate and the low-volatile oxidized organic aerosols (LV-OOA) exhibited more regional footprints and potentially have similar formation mechanisms. The atomic oxygen-to-carbon (O/C) ratio also increased from 0.45 to 0.9, thereby suggesting that rapid formation of highly oxidized secondary organic aerosols (SOA) occurred during transport. Overall, these results provide valuable insight into the evolution of the chemical and physical features of aerosol pollution during transport and also highlight the need for regulatory controls of nitrogen oxides, sulfur dioxide, and VOCs to improve air quality on different scales.