采用电迁移率粒径谱仪SMPS 3936对颗粒物数浓度及其谱分布进行了实时监测, 对2013年兰州市国际马拉松赛交通管制期间细颗粒物浓度及其谱分布特征开展研究, 并通过多元对数正态分布拟合和主成分分析方法分别对数浓度谱特征及其影响因素进行了分析, 以阐明2013年兰州国际马拉松赛期间交通管制对细颗粒物浓度及其谱特征的影响.气象条件相似的交通限行期间, 交通限行日50~100 nm, 100~200 nm和200~500 nm粒径段颗粒物数浓度均较正常周六有所降低, 特别是50~200 nm粒径段颗粒物表现最为显著, 在此期间, 交通限行日50~100 nm和100~200 nm粒径段平均颗粒物数浓度分别为2567.5±807.4 cm-3和1567.8±193.8 cm-3, 分别较正常周六相应时段低60.2%和67.2%.交通限行对颗粒物数浓度的影响主要集中在107 nm为峰值粒径的积聚模态附近, 而气象条件对10~300 nm粒径段颗粒物数浓度均有较显著的影响, 最大影响在80 nm附近.
The air pollution characteristics during the 2013 Lanzhou International Marathon were investigated by measuring particles concentrations in the size range 10 to 600 nm using a TSI particle sizer from 1 to 30 June, 2013 in urban Lanzhou. The particle number concentrations in size ranges 50~100 nm, 100~200 nm and 200~500 nm on traffic-restricted day were significantly lower than those on normal Saturday during the temporary traffic control period with comparable meteorological conditions (11:00 (Beijing Time, hereafter the same)14:00), especially fine particles with diameters ranging from 50 to 200 nm. For the period with similar meteorological conditions (11:00-14:00), the mean particle number concentrations in the size ranges 50~100 nm and 100~200 nm were 2567.5±807.4 cm-3 and 1567.8±193.8 cm-3, respectively, on 15 June (traffic-restricted day), which is 60.2% and 67.2% lower than those on 22 June (normal saturday). The impacts of traffic restriction on particle number concentration mainly concentrated on accumulation modes with peak in 107 nm. Meteorological conditions had significant influence on particle number concentration in the size range 10~300 nm with a larger effect in 80 nm.
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