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,0.54~19.81μm)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9.96×103cm^(-3)和9.19×103cm^(-3),其次是核模态颗粒物,其数浓度为1.16×103cm^(-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1.1×104cm^(-3)、1.0×104cm^(-3)和6.3×103cm^(-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.
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 p,m 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 9.96×10^3 cm^-3 and 9.19×10^3 cm^-3 , respectively. Coarse mode had the lowest number concentration of only 13 cm^-3. The particles of nucleation mode were in between （ 1.16×10^3 cm^-3 ）. The number concentration of particles decreased significantly during the control periods, with the lowest value of 1.1 × 10^4 cm^-3 , 1.0×10^4 cm^-3 and 6.3×10^3 cm^-3 on 2nd, 6tb and 12tb 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.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第12期4295-4302,共8页
Acta Scientiae Circumstantiae
基金
国家重大科学仪器研发项目(No.2011YQ060111)~~
关键词
空气颗粒物
粒谱分布
APEC会议
颗粒物模态
数浓度
air particulate matter
particular size distribution
meeting of APEC
four kinds of particulate mutter mode
number concentration
