Abstract
Air pollution has become the predominant environmental problem caused by rapid industrialization and urbanization in China. In this study, measurements of the concentrations of PM2.5, PM10, SO2, NO2, CO, and O3 at six monitoring stations in Baotou, China were used to investigate the characteristics of heavy haze pollution in Dec. 12–25, 2013. Source locations of PM2.5 in Baotou were identified using satellite remote sensing data, an air mass trajectory model, and a conditional probability function (CPF). The results showed that the average concentrations of PM2.5 and PM10 were (113.8±84.0) μg/m3 and (211.1±149.2) μg/m3, respectively. The similar trends in temporal variation of the air pollutants PM2.5, PM10, SO2, NO2, and CO suggested they may share common sources. The results of satellite observations and backward trajectories supported the hypothesis that the pollutants causing the haze event originated mainly from local anthropogenic sources. According to the CPF analysis, low-speed winds from the south and southwest, upwind industrial emissions, and the northern mountains were mainly responsible for the formation of haze in Baotou. The study provides some insights to help governments optimize industrial layouts for improving air quality in the future.
摘要
目的
工业排放是大气中PM2.5 的重要来源,是灰霾形成 的主要贡献者之一。通过分析包头市一次典型灰 霾时段的污染来源及特征,研究本地工业布局在 此次灰霾时段对灰霾形成的影响,并讨论城市工 业布局的合理性。
创新点
针对我国典型重工业城市包头市进行案例分析, 研究本地城区灰霾形成的原因及重工业布局对 灰霾形成的影响,并为合理布局工业提供了新的 启示。
方法
1. 结合污染物观测数据、卫星遥感数据及后向轨 迹模式的结果,揭示此次重灰霾发生时段的污染 特征,找出此次重灰霾的主要来源。2. 采用风向 条件概率函数研究城区高浓度PM2.5 与本地重工 业布局间的关系。
结论
1. 在此次重灰霾时段,PM2.5 浓度的变化趋势与其 他污染物相似,说明污染主要来自人为源,且在 同样发生重灰霾的情况下,PM2.5 占PM10 的比例 较其他沿海城市低,说明粗颗粒物对包头PM10 污染的贡献较其他城市大。2. 结合卫星遥感数据 与后向轨迹模式的结果,可以排除外来污染物的 输入,并断定形成此次重灰霾的主要原因为本地 人为源。3. 风向条件概率函数分析结果显示本地 重工业分布以及低风速的西南风(非盛行风)是 造成此次重灰霾发生的主要原因。4. 揭示了包头 市在布局重工业或进行高强度的工业活动时不能 只考虑避开盛行风,因为出现次数不多的低风速 非盛行风同样会引起重灰霾的爆发;这可为包头 市乃至其他工业城市在进一步调整工业布局时提 供参考。
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Project supported by the National Natural Science Foundation of China (No. 21577125)
ORCID: Bi-xin CHEN, http://orcid.org/0000-0002-8294-5643; Qing-yu ZHANG, http://orcid.org/0000-0002-6509-1869
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Chen, Bx., Wang, S., Yang, Wd. et al. Characteristics and origins of a typical heavy haze episode in Baotou, China: implications for the spatial distribution of industrial sources. J. Zhejiang Univ. Sci. A 18, 151–162 (2017). https://doi.org/10.1631/jzus.A1500284
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DOI: https://doi.org/10.1631/jzus.A1500284