利用3nm～20μm颗粒物粒径分布测量仪对南宁市大气颗粒物粒径分布特征进行研究

发布时间：2018-02-10 01:47

本文关键词： 颗粒物粒径分布测量仪数浓度粒径分布南宁　出处：《环境科学学报》2017年12期 　论文类型：期刊论文

【摘要】：利用颗粒物粒径分布测量仪(particle size distribution system,PSD)对南宁市2016年11月15日—12月4日大气颗粒物进行实时监测,分析颗粒物数浓度、粒径分布特征及其与颗粒物质量浓度的关系.结果表明,南宁市3 nm~20μm颗粒物平均数浓度为3269个·cm-3,粒径呈双峰分布,主峰值出现在28 nm左右,次峰值出现在100 nm左右.颗粒物数浓度随时间变化呈现一定规律,即早上8:00—10:00和晚上18:00—20:00左右出现浓度高值,这与早晚高峰有关.新粒子一般在16:00~18:00左右开始生成,18:00—20:00左右逐渐长大,并在夜间至凌晨保持较高的浓度.南宁市监测期间新粒子生成与机动车尾气排放有关.颗粒物质量浓度越大对应的数浓度也相应较高,较大粒径颗粒物对质量浓度贡献较大.降雨和风速加大过程对颗粒物数浓度下降有影响;温度和湿度对颗粒物数浓度影响不明显.
[Abstract]:The particle size distribution system was used to monitor the particle size distribution in Nanning from November 15th 2016 to December 4th. The characteristics of particle number, particle size distribution and the relationship between particle size distribution and particle mass concentration were analyzed. The average concentration of 3 nm~20 渭 m particles in Nanning was 3269 路cm ~ (-3). The particle size showed a bimodal distribution, the main peak appeared at about 28 nm and the secondary peak appeared at about 100nm. That is, a high concentration of around 8: 00-10: 00 in the morning and 18: 00-20: 00 in the evening, which is related to the peak in the morning and evening. The new particles usually start to grow up at about 16: 00 or 18: 00, and gradually grow up about 18: 00-20: 00. During the monitoring period of Nanning, the new particle formation is related to vehicle exhaust emission. The higher the mass concentration of particulate matter, the higher the corresponding number concentration. The effects of precipitation and wind speed on the number of particles decreased, while temperature and humidity had no significant effect on the concentration of particles.
【作者单位】：广西壮族自治区环境保护科学研究院;清华大学环境学院;复旦大学环境科学与工程系;
【基金】：广西科学研究与技术开发计划项目(No.桂科合14125008-2-11) 广西自然科学基金(No.2015GXNSFBA139203) 广西科技计划项目(No.桂科AB16380292)~~
【分类号】：X831

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