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京津冀郊区站点秋冬季大气PM2.5来源解析
摘要点击 2795  全文点击 943  投稿时间:2018-08-01  修订日期:2018-09-05
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中文关键词  源解析  化学质量平衡模型(CMB)  京津冀  PM2.5重污染  民用燃煤
英文关键词  source apportionment  chemical mass balance model (CMB)  Beijing-Tianjin-Hebei region  heavy PM2.5 pollution  residential coal combustion
作者单位E-mail
王彤 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
国家环境保护大气复合污染来源与控制重点实验室, 北京 100084 
tong-wan16@mails.tsinghua.edu.cn 
华阳 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
国家环境保护大气复合污染来源与控制重点实验室, 北京 100084 
 
许庆成 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
国家环境保护大气复合污染来源与控制重点实验室, 北京 100084 
 
王书肖 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
国家环境保护大气复合污染来源与控制重点实验室, 北京 100084 
shxwang@tsinghua.edu.cn 
中文摘要
      为了增进对京津冀地区大气PM2.5来源情况的认识,于2014~2015年秋冬季在京津冀地区4个郊区站点进行了PM2.5的采样,并用化学质量平衡模型(chemical mass balance model,CMB)进行了PM2.5源解析工作.结果表明:二次颗粒物(36%~58%)、交通(8%~26%)、民用燃煤(8%~16%)和生物质燃烧(5%~16%)是京津冀郊区站点秋冬季PM2.5的主要贡献源.其中,二次硝酸盐是大部分站点秋冬季PM2.5的首要贡献源(11%~27%).不同污染程度的源解析显示,冬季各站点各污染源在重污染天的贡献变化趋势的同步性不如秋季明显,且秋季二次源在重污染天的贡献增加值(47.2~115.7 μg·m-3)明显高于一次源(29.5~43.4 μg·m-3),但此现象在冬季不显著.对比北京市城区源解析结果,发现郊区燃煤总贡献率较为相似,但郊区燃煤源中多以民用燃煤为主,这说明对于京津冀城郊地区,控制民用燃煤源对PM2.5污染控制有重要意义.
英文摘要
      To identify the main sources of PM2.5 in Beijing-Tianjin-Hebei (BTH) region, PM2.5 samples were collected at four suburban sites in BTH region during autumn and winter in 2014-2015. Source apportionment of PM2.5 was conducted using the chemical mass balance model (CMB). It shows that the main sources of PM2.5 in autumn and winter were secondary aerosols (36%-58%), traffic (8%-26%), residential coal combustion (8%-16%), and biomass burning (5%-16%). Secondary nitrate was the most important source of PM2.5 at most sites during autumn and winter (11%-27%). The source apportionment at different pollution levels indicates that the coherence of the increasing trend of different sources among the four sites were much more obvious in autumn than in winter. Also, the increasing contribution of secondary sources (47.2-115.7 μg·m-3) was much higher than that of primary sources (29.5-43.4 μg·m-3) in autumn, but such trend was not significant in winter. The total contribution of coal combustion at suburban sites was quite similar to that in urban sites, but in suburban areas residential coal combustion dominates the contribution from coal combustion. Thus, it is very necessary for suburban areas of the BTH region to control emissions from residential coal combustion.

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