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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.
The particle size distribution system (PSD) was used to monitor the atmospheric particulates in Nanning from November 15, 2016 to December 4, 2016. The characteristics of particle number concentration, particle size distribution and its correlation with particle mass concentration The results showed that the average concentration of 3 nm ~ 20 μm particles in Nanning was 3269 cm-3, with a bimodal distribution with the main peak at about 28 nm and the sub peak at about 100 nm. Changes with time showed a certain law, that morning 8: 00-10: 00 and 18: 00-20: 00 around the high concentration, which is related to the peak morning and evening .New particles generally start around 16: 00 ~ 18: 00 Generation, gradually grow up around 18: 00-20: 00, and keep a high concentration from night to midnight.Nanning City, the new particles generated during the monitoring and vehicle emissions related to the higher the concentration of particulate matter corresponding to the number of concentrations corresponding to Higher and larger particle size particles contributed more to the mass concentration, and the process of increasing rainfall and wind speed had an impact on the decrease of particle number concentration, while the temperature and humidity had no significant effect on the particle number concentration.