LIU Qin,YIN Hong-ling,DENG Liang,et al.The Pollution Characteristics of PM2.5 in Different Humidity Segment in Winter of Chengdu[J].Journal of Chengdu University of Information Technology,2017,(06):662-666.[doi:10.16836/j.cnki.jcuit.2017.06.015]
成都市大气PM2.5在冬季不同湿度条件下的污染特征
- Title:
- The Pollution Characteristics of PM2.5 in Different Humidity Segment in Winter of Chengdu
- 文章编号:
- 2096-1618(2017)06-0662-05
- Keywords:
- environmental science; environmental monitoring; fine particulate matter; pollution characteristic; humidity; water-soluble ion
- 分类号:
- X131.1
- 文献标志码:
- A
- 摘要:
- 为研究冬季城市大气细颗粒物(PM2.5)在不同湿度段的污染特征,选取相对湿度(RH)较高的成都市为研究区域,于2014年冬季划分RH<60%,60%<RH<80%和RH>80% 3个湿度段进行大气PM2.5采样。结果表明:采样期间PM2.5日均浓度范围为106.96～233.89 μg/m3,超标率100%。PM2.5浓度和RH相关系数r=0.473。PM2.5质量浓度、总离子浓度及二次离子浓度在RH>80%分别是RH<60%时的1.48倍、1.74倍和1.89倍,与成都市高湿静稳天气造成污染累积有关。主成分分析发现RH>80%时PM2.5的主要来源是燃煤燃油源,而RH<60%时,主要为机动车尾气和扬尘源等。
- Abstract:
- In order to study the pollution characteristics of fine particulate matter(PM2.5)in different humidity segments during winter, Chengdu City, with high relative humidity(RH), was selected as the study area and the PM2.5 samples were collected in winter, 2014. The division of RH<60%,60%<RH<80% and RH>80% represented three humidity segments for sampling. The results showed that the mass concentrations of PM2.5 were 106.96-233.89 μg/m3 and the standard exceeding ratio was 100% in sampling period. The correlation coefficient of concentration of PM2.5 with humidity was 0.473. The concentration of PM2.5, total ions and the second inorganic ions during RH>80% was1.48,1.74 and 1.89 times as much as that in RH<60%, which was relative with the static stability and higher moisture resulting pollution accumulation. The results of principal component analysis that showed the main sources of PM2.5 were coal and oil combustion emissions when RH>80%, whereas dust and motor vehicles emission were the main sources when RH<60%.
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备注/Memo
收稿日期:2017-03-09 基金项目:四川省教育厅基金资助项目(重点)(13Z197); 国家自然科学基金资助项目(21407014); 四川省科技支撑计划基金资助项目(2015GZ0240)