摘要
在同步观测广州市秋季PM_(2.5)主要化学成分、相关污染气体和气象因子的基础上,分析了PM_(2.5)污染事件的主要成因.结果显示:秋季观测期间PM_(2.5)质量浓度均值为(47±23)μg·m^(-3),黑碳(BC),NH^(4+),NO_(3)^(-)和SO_(4)^(2-)质量浓度均值分别为(4.2±2.6),(3.5±2.8),(4.0±6.5)和(10.5±3.5)μg·m^(-3).PM_(2.5)污染事件期间,PM_(2.5),BC,NH_(4+),NO_(3)^(-)和SO_(4)^(2-)质量浓度均值分别是非污染事件期间浓度的2.1,2.1,3.4,6.7和1.7倍.NO_(3)^(-)爆发性增长是PM_(2.5)污染事件主要驱动因素之一.夜间污染事件主要与N2O5的水解有关,昼间污染事件主要与云过程有关.
To investigate the key factor of PM_(2.5) pollution episodes,the dominant chemical components in PM_(2.5),trace gases and meteorological factors were simultaneously measured at high time resolution in urban Guangzhou.The results show that the average concentration of PM_(2.5) during the autumn observation period is(47±23)μg·m^(-3),and the average concentrations of black carbon(BC),NH^(4+),NO^(2-)and SO_(4)^(2-)are(4.2±2.6),(3.5±2.8),(4.0±6.5)and(10.5±3.5)μg·m^(-3),respectively.During PM2.s pollution events,the average concentrations of PM_(2.5),BC,NH^(4+),NO^(3-) and SO_(4)^(2-) were 2.1,2.1,3.4,6.7 and 1.7 times the concentrations during non-pollution events,respectively.The explosive growth of NO3-is one of the main driving factors of PM_(2.5) pollution events.The pollution events at night are mainly related to the hydrolysis of N_(2)O_(5),and the pollution events during the day are mainly related to cloud processes.
作者
卞国建
康娟
瞿群
刘祚屹
BIAN Guojian;KANG Juan;QU Qun;LIU Zuoyi(South China Institute of Environment Sciences,Ministry of Ecological Environment,Guangzhou 510655,China;Guangdong Branch,Zhonghuan Guangyuan Environmental Engineering Technology Co.,Ltd.,Guangzhou 510000,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2023年第1期99-104,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(41775155,41475119,41603119)。
关键词
化学组分
O3
N2O5
水解
云过程
chemical components
ozone
N_(2)O_(5)
hydrolysis
cloud process
作者简介
通信作者:刘祚屹,E-mail:liuzuoyi@scies.org。
