Characterization of PM2.5 chemical composition at the Demokritos suburban station, in Athens Greece. The influence of Saharan dust
Characterization of PM2.5 chemical composition at the Demokritos suburban station, in Athens Greece. The influence of Saharan dust
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DOI：
10.1007/s11356-017-8684-3
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发表时间：
2017-03
影响因子：
5.8
通讯作者：
V. Vasilatou;E. Diapouli;Dimitrios Abatzoglou;E. Bakeas;M. Scoullos;K. Eleftheriadis
中科院分区：
文献类型：
--
作者：
V. Vasilatou;E. Diapouli;Dimitrios Abatzoglou;E. Bakeas;M. Scoullos;K. Eleftheriadis
这项工作的目的是研究在希腊雅典郊区发现的PM2.5中选定的主要和微量元素和离子的大气浓度，并讨论不同来源的影响。特别关注撒哈拉沙尘事件的影响。还研究了金属和离子浓度的季节性变化。结果表明：pm2.5质量浓度受撒哈拉沙尘事件影响显著；观察到，当pm2.5浓度大于25 μg/m3时，6次中有5次气团在边界层内的高度穿越北非。铁元素的季节变异性更显著，在寒冷期表现出更高的浓度。该数据集在寒冷时期频繁的撒哈拉沙尘入侵可能解释了这一结果。矿物粉尘和二次气溶胶是pm2.5的主要成分（分别占29%和34%）。在撒哈拉沙尘事件期间，与没有沙尘入侵的日子相比，矿物粉尘的浓度增加了35%，同时也观察到海盐增加了68%。在事件日期间，pm2.5浓度也增加了14%。在这些日子里，人为成分没有减少，而硫酸盐甚至略有增加，表明矿物粉尘富集了次生硫酸盐。结果表明，即使在pm2.5分数中，非洲沙尘入侵也增加了相当显著的PM污染负荷，这对人群暴露和人类健康有影响。
The aim of this work is to study the atmospheric concentrations of selected major and trace elements and ions found in PM2.5, at a suburban site in Athens, Greece, and discuss on the impact of the different sources. Special focus is given to the influence of Saharan dust episodes. The seasonal variability in the metal and ion concentrations is also examined. The results show that PM2.5mass concentrations are significantly influenced by Saharan dust events; it is observed that when the PM2.5concentration is higher than 25 μg/m3, five out of six times, the air mass crossed North Africa at an altitude within the boundary layer. Fe is found to be the element with the more significant seasonal variability, displaying much higher concentrations during cold period. The frequent Saharan dust intrusions in the cold period of this dataset may explain this result. Mineral dust and secondary aerosol are the main PM2.5components (29 and 34%, respectively). During Saharan dust events, the concentration of mineral dust is increased by 35% compared to the days without dust intrusions, while an increase of 68% of the sea salt is also observed. During event days, PM2.5concentrations are also increased by 14%. Anthropogenic components do not decrease during those days, while sulfate displays even a slight increase, suggesting enrichment of mineral dust with secondary sulfates. The results indicate that African dust intrusions add a rather significant PM pollution load even in the PM2.5fraction, with implication to population exposure and human health.