引用本文:魏欣,毕晓辉,董海燕,陈魁,孙韧,冯银厂,等.天津市夏季灰霾与非灰霾天气下颗粒物污染特征与来源解析[J].环境科学研究,2012,25(11):1193-1200.
WEI Xin,BI Xiao-hui,DONG Hai-yan,CHEN Kui,SUN Ren,FENG Yin-chang,et al.Characteristics and Sources of Particulate Matter during Hazy and Non-Hazy Episodes in Tianjin City in Summer[J].Reserrch of Environmental Science,2012,25(11):1193-1200.]
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天津市夏季灰霾与非灰霾天气下颗粒物污染特征与来源解析
魏欣,毕晓辉,董海燕,陈魁,孙韧,冯银厂,等
作者单位E-mail
魏欣 南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津300071 weixin880307@yahoo.com.cn 
毕晓辉 南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津300071  
董海燕 天津市环境监测中心, 天津300191  
陈魁 天津市环境监测中心, 天津300191  
孙韧 天津市环境监测中心, 天津300191  
冯银厂 南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津300071  
摘要:
年6—8月在天津市区进行的连续灰霾观测发现,灰霾发生的天数占观测时段的13. 灰霾日与非灰霾日颗粒物质量浓度存在显著差异,灰霾日ρ(PM2.5)与ρ(PM10)的平均值分别是非灰霾日的1.64和1.55倍. 灰霾日S含量高于非灰霾日近50%;灰霾日ρ(SO42-)和ρ(NO3-)明显高于非灰霾日,其中灰霾日ρ(NO3-)增幅最高可达251.02%;灰霾日PM2.5和PM10中的ρ(OC)、ρ(EC)均是非灰霾日的1.25倍以上. 灰霾日与非灰霾日的气象条件相近,表明此次观测期间天津市区夏季灰霾天气发生与气象条件的关系不大. 使用CMB模型(化学质量平衡模型)对PM2.5来源进行的解析表明,二次硝酸盐和二次硫酸盐对灰霾日ρ(PM2.5)的贡献率分别是非灰霾日的2.17和1.34倍,而其他源类在灰霾日和非灰霾日的贡献差异不明显,说明二次离子可能是造成天津市区夏季灰霾最主要的颗粒物源类.
关键词:  灰霾  颗粒物  化学组分  源解析  天津市
DOI:
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基金项目:国家环境保护公益性行业科研专项(201109002)
Characteristics and Sources of Particulate Matter during Hazy and Non-Hazy Episodes in Tianjin City in Summer
WEI Xin,BI Xiao-hui,DONG Hai-yan,CHEN Kui,SUN Ren,FENG Yin-chang,et al
Abstract:
Continuous observation of haze episodes in downtown Tianjin was conducted from June to August in 2011. The results showed that one-third of the period were hazy days. There was a significant difference in the mass concentrations of the particles during the hazy and non-hazy days. PM2.5 and PM10 concentrations on the hazy days were 1.64 and 1.55 times higher than those on non-hazy days. When the haze occurred, the elemental percentage of S was about 1.5 times higher than that during the normal days. ρ(SO42-) and ρ(NO3-) in the hazy days were clearly higher than those in the non-hazy days, and the largest increase of ρ(NO3-) during the hazy days was up to 251.02%. Both OC and EC in PM2.5 and PM10 during the hazy days were 1.25 times more than those in the non-hazy days. Similar weather conditions in the hazy and non-hazy days suggested that the weather conditions did not play a great role in the occurrence of haze during the observation period. Analysis of the sources of PM2.5 by the chemical mass balance (CMB) receptor model showed that contributions of the secondary nitrate and sulfate on the hazy days were 2.17 and 1.34 times higher than on the non-hazy days, while the contributions of the other sources were not significant. These results demonstrated that secondary particles may be the primary source of summer haze.
Key words:  haze  particulate mass  chemical composition  source apportionment  Tianjin City