摘要
综合分析北京地区典型秋季挥发性有机物(VOCs)及各相关污染物的污染水平以及日夜变化趋势,说明VOCs的组成和浓度特征.VOCs平均小时浓度为54.6 ppb,其中,非甲烷碳氢化合物(NMHCs)为38.0 ppb;含氧挥发性有机物(OVOCs)为10.4 ppb.通过对VOCs特征组分的日夜变化和特征比值(E/E和B/T)的分析,发现研究区域大气老化现象明显,且受机动车尾气影响显著.结合后向气流轨迹分析和对采样期间正午时段的B/T值特征的解释,印证了以上结论.
Ninety-nine volatile organic compounds （VOCs） species were measured in autumn in Beijing. The average concentration of VOCs was 54.6 ppb. The average concentiations of NMHCs and oxygenated VOCs were 38.0 ppb and 10.04 ppb, respectively. The pollution status of VOCs was evaluated based on the diurnal variation and ratio between typical VOCs species （E/E and B/T）. The air masses observed were characterized to photochemical-aged and supposed to be affected mainly by traffic emission sources. The same conclusion was reached by the co-analysis of air mass backward trajectory and B/T value at noon.
出处
《中国科学院大学学报（中英文）》
CAS
CSCD
北大核心
2014年第3期329-336,共8页
Journal of University of Chinese Academy of Sciences
基金
国家自然科学基金(41005065
41375132)
国家环境保护公益性科研专项(201009001
201309011
201409003)资助
关键词
北京
秋季
挥发性有机物
污染特征
来源
Beijing
autumn
VOCs
pollution level
source characteristics
