摘要
于2010年11月4～30日在广州城区每天昼夜各采集一个PM2.5样品.对样品进行有机碳、元素碳和水溶性离子分析,同步收集了在线PM2.5浓度、大气消光系数(bext)以及气象因子,探讨了PM2.5特征及其与大气消光系数的关系,并利用修正后的IMPROVE消光系数方程重建大气消光系数.结果发现:亚运期间PM2.5日均值质量浓度为(77.0±24.4)μg·m-3,比亚运前低27.8%.PM2.5和相对湿度是导致霾天气的重要因素.亚运期间大气消光系数为418 Mm-1,比亚运前低28.3%,(NH4)2SO4、POM(particulate organic material)和LAC(light-absorbing carbon)是主要贡献因子,贡献率达到87.0%.广州及其周边城市采取的减排措施对于缓解亚运期间广州城区的霾天气作用明显.
Aerosol samples for PM2.5 were collected days and nights from 4 to 30 November 2010 in Guangzhou.The concentrations of organic carbon,element carbon,and water-solubility ions of all particle samples were determined by thermal/optical carbon analyzer and ion chromatography,respectively.In-situ online PM2.5 mass concentrations,light extinction coefficients（bext）,and selected meteorological parameters for this period were also measured.Temporal variation of PM2.5 mass concentrations and its relationship with bext were discussed,and bext was reconstructed by revised IMPROVE formula.The results showed that the average mass concentration of PM2.5 was（77.0±24.4） μg·m-3 during the Asian Games period,which was 27.8% lower than that of the period before Asian Games.PM2.5 and relative humidity were the dominant factors contributing to hazy weather.The average value of bext was 418 Mm-1 during the Asian Games period,which was 28.3% lower than that of the period before Asian Games.The major contributors to bext included（NH4）2SO4,POM,and LAC,which accounted for 87.0% of bext during the Asian Games period.A series of stringent air quality control measures were implemented by the Guangzhou Municipal Government and other cooperative cities,which greatly alleviated the hazy weathers in Guangzhou urban area during the Asian Games period.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第2期409-415,共7页
Environmental Science
基金
环境保护公益性行业科研专项(200809143
201009001)
关键词
亚运会
PM2
5
化学组分
霾
大气消光系数
Asian Games
PM2.5 aerosol
chemical composition
haze
light extinction coefficient
