Black carbon at a roadside site in Beijing: Temporal variations and relationships with carbon monoxide and particle number size distribution
Black carbon at a roadside site in Beijing: Temporal variations and relationships with carbon monoxide and particle number size distribution
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DOI：
10.1016/j.atmosenv.2013.04.055
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发表时间：
2013-10
影响因子：
5
通讯作者：
Shaojie Song;Ye Wu;Jiayu Xu;T. Ohara;S. Hasegawa;Jiaqi Li;Liu Yang;J. Hao
中科院分区：
文献类型：
--
作者：
Shaojie Song;Ye Wu;Jiayu Xu;T. Ohara;S. Hasegawa;Jiaqi Li;Liu Yang;J. Hao
在2009年夏季和冬季的实地调查期间，在北京的一条主要城市高速公路附近测量了黑碳（BC）、一氧化碳（CO）和颗粒物的数量尺寸分布。在城市和农村地区也观察到了BC。分析了碳浓度的时间变化及其与CO和颗粒物粒径分布的关系。夏季和冬季活动期间，路边站点的平均BC浓度分别为12.3和17.9 μg m− 3。BC浓度大小顺序为路边>城市>农村。在所有网站的一般昼夜模式显示，较高的BC水平在夜间观察。夏季BC在路边站点的日变化模式的重型柴油车（HDDV）。夜间HDDV比例增加导致ΔBC/ΔCO比值升高。研究表明，HDDV是影响北京市主要道路附近Aitken模式和累积模式夜间BC和颗粒物数浓度的重要因素，尤其是在夏季。
Black carbon (BC), carbon monoxide (CO), and particle number size distribution were measured near a major urban expressway of Beijing during summer and winter field campaigns in 2009. BC was also observed at urban and rural sites. The temporal variations of BC and its relationships with CO and particle number size distribution were analyzed. The average BC concentrations at the roadside site were 12.3 and 17.9 μg m−3during the summer and winter campaigns, respectively. BC concentrations ranked in the order of roadside > urban > rural. A general diurnal pattern at all sites showed that the higher BC levels were observed at night. The diurnal pattern of summertime BC at the roadside site followed the variations of heavy-duty diesel vehicles (HDDVs). The increased proportion of HDDVs at night contributed to high ΔBC/ΔCO ratios. This study suggests that HDDVs are an important contributor to nighttime BC and particle number concentrations of both Aitken and accumulation modes near major roadways in Beijing, especially in summer.