| 摘要: |
| 利用单颗粒气溶胶质谱仪对张家口市2015年春季的一次典型沙尘过程进行了监测，分析了沙尘过程对当地大气颗粒物成分的影响。结果表明，监测期间的颗粒物类型主要分为8种：矿物质(MD)、左旋葡聚糖(LEV)、元素碳(EC)、有机碳(OC)、混合碳(ECOC)、重金属(HM)、富钾(K)、其他(Other)。对比沙尘天气来临前、中、后3个时段，随着沙尘天气的来临，本地大气颗粒物成分发生较大变化，矿物质、左旋葡聚糖等成分含量升高，而有机碳、重金属等成分含量下降，其中矿物质在PM10峰值时段小时比例高达27.8%；沙尘天气期间，由于矿物质颗粒占比增加，使得总颗粒物的粒径分布向0.9 μm以上的粗粒径段偏移；此外，沙尘天气期间的颗粒物各成分与二次组分的混合程度相较非沙尘天气时段的低，说明其老化程度相对较低。 |
| 关键词: 张家口市 沙尘天气 成分 颗粒物 粒径 混合程度 单颗粒气溶胶质谱仪 |
| DOI： |
| 分类号:X513 |
| 文献标识码:B |
| 基金项目: |
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| Characteristics of Single Particle Aerosols during a Sandstorm in Zhangjiakou |
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BI Yanru, HUANG Bo, LI Mei1,2,3
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1. Guangzhou Hexin Instrument Company Limited, Guangzhou, Guangdong 510530,China;2.Institute of Mass Spectrometer and Atmospheric Environmental, Jinan University, Guangzhou, Guangdong 510632,China;3.Guangdong Engineering Research Center for atmospheric pollution online source apportionment system, Guangzhou, Guangdong 510632,China
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| Abstract: |
| A single particle aerosol mass spectrometer (SPAMS) was deployed in Zhangjiakou during a sandstorm period to evaluate the impact of sandstorm to ambient aerosols. According to the monitoring result, particles during the monitoring period can be divided into eight types: mineral dust(MD), levoglucosan (LEV), elemental carbon(EC), organic carbon(OC), internally mixed organic and elemental carbon(ECOC), heavy metal(HM), K rich(K), others(Other). Profound changes of chemical composition were discovered through comparative analysis of particles during different stages of the sandstorm. As the sandstorm begins, the proportion of MD and LEV increased, while those of OC and HM decreased at the same time. In particular, the proportion of MD in the peak hours of ρ(PM10) was up to 27.8%. The size distribution of total particles increased to 0.9 μm above during the sandstorm due to the dramatically increasing of MD proportion. In addition, the extent of mixing of particles with secondary components during the dust weather was relatively low, indicating that particles during sandstorm were less aged. |
| Key words: Zhangjiakou city Sandstorm Chemical composition Particles Particle size Mixing Single particle aerosol mass spectrometer |
