• 关键词：空气颗粒物  粒谱分布  APEC会议  颗粒物模态  数浓度

• 基金项目：国家重大科学仪器研发项目（No.2011YQ060111）

• 李刚
• 1 天津城建大学环境与市政工程学院, 天津 300384;2 中国环境科学研究院大气化学与气溶胶科技创新基地, 北京 100012

• 吴丽萍
• 天津城建大学环境与市政工程学院, 天津 300384

• 杨文
• 中国环境科学研究院大气化学与气溶胶科技创新基地, 北京 100012

• 韩斌
• 中国环境科学研究院大气化学与气溶胶科技创新基地, 北京 100012

• 白志鹏
• 中国环境科学研究院大气化学与气溶胶科技创新基地, 北京 100012

• 摘要：为了研究APEC减排期间不同模态颗粒物数浓度分布特征，使用扫描电迁移率粒径分析仪（Scanning Mobility Particle Sizer，3936，TSI，4~737 nm）和空气动力学粒径谱仪（Aerodynamic Particle Sizer，3321，TSI，0.54~19.81 μm）对2014年APEC会议期间北京市空气颗粒物进行观测.根据核模态、爱根核模态、积聚模态和粗粒子模态颗粒物的数浓度变化和粒谱分布特征.结果表明：APEC会议期间（减排第2阶段，11月6日-12日）空气颗粒物主要以爱根核模态和积聚模态颗粒物为主，其数浓度分别为9.96×10³ cm^-3和9.19×10³ cm^-3，其次是核模态颗粒物，其数浓度为1.16×10³ cm^-3，粗粒子模态颗粒物数浓度相对较低，为13 cm^-3，其中11月2、6和12日颗粒物总数浓度均出现最低谷值，分别为1.1×10⁴ cm^-3、1.0×10⁴ cm^-3和6.3×10³ cm^-3.相比减排前，减排期核模态颗粒物浓度降低最多，平均降低39.1%，爱根核模态和积聚模态缓慢降低，但与往年同期相比各模态颗粒物数浓度均有明显下降.

• Abstract：In order to investigate the variation of different modes of particles during the emission control periods of APEC in Beijing, China, the Scanning Mobility Particle Sizer (SMPS, 3936, TSI) and Aerodynamic Particle Sizer (APS, 3321, TSI)were used to measure the particle sizes of 4~737 nm and 0.54~19.81 μm ranges during 26th October to 18th November 2014. The number size distribution, as well as the variation of four different modes of particles, i.e. nucleation mode (1~25 nm), aitken mode (25~100 nm), accumulation mode (100~1000 nm) and coarse mode (>1000 nm), were discussed. Results showed that the highest number concentrations of particles during the APEC periods (the 2nd emission control stage, from 6th to 12th November) were concentrated in the aitken and accumulation modes, with the number concentration of 9.96×10³ cm^-3 and 9.19×10³ cm^-3, respectively. Coarse mode had the lowest number concentration of only 13 cm^-3. The particles of nucleation mode were in between (1.16×10³ cm^-3). The number concentration of particles decreased significantly during the control periods, with the lowest value of 1.1×10⁴ cm^-3, 1.0×10⁴ cm^-3 and 6.3×10³ cm^-3 on 2nd, 6th and 12th November, respectively. Compared to those of non-control periods, particles in the nucleation mode decreased mostly during the 2nd emission control period, and the average ratio of reduction was 39.1%. Particles in the aitken and accumulation modes decreased slightly. Compared to the number concentration of the same period in previous years, the number concentrations of each mode decreased significantly.

• Key words：air particulate matter  particular size distribution  meeting of APEC  four kinds of particulate matter mode  number concentration

• 
  摘要点击次数： 1280 全文下载次数： 2489