中文关键词源解析化学质量平衡模型(CMB)京津冀PM_2.5重污染民用燃煤 英文关键词source apportionmentchemical mass balance model (CMB)Beijing-Tianjin-Hebei regionheavy PM_2.5 pollutionresidential 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PM_2.5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PM_2.5的采样，并用化学质量平衡模型（chemical mass balance model，CMB）进行了PM_2.5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PM_2.5的主要贡献源.其中，二次硝酸盐是大部分站点秋冬季PM_2.5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PM_2.5污染控制有重要意义. 英文摘要 To identify the main sources of PM_2.5 in Beijing-Tianjin-Hebei (BTH) region, PM_2.5 samples were collected at four suburban sites in BTH region during autumn and winter in 2014-2015. Source apportionment of PM_2.5 was conducted using the chemical mass balance model (CMB). It shows that the main sources of PM_2.5 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 PM_2.5 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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