Origin of air pollution during a weekly heavy haze episode in Hangzhou, China
Origin of air pollution during a weekly heavy haze episode in Hangzhou, China
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DOI：
10.1007/s10311-014-0483-1
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发表时间：
2014-10
影响因子：
15.7
通讯作者：
Shaocai Yu;Qingyu Zhang;Ren-chang Yan;Si-Qi Wang;Pengfei Li;Bi-xin Chen;Weiping Liu;Xiaoyu Zhang-Xiaoyu
中科院分区：
文献类型：
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作者：
Shaocai Yu;Qingyu Zhang;Ren-chang Yan;Si-Qi Wang;Pengfei Li;Bi-xin Chen;Weiping Liu;Xiaoyu Zhang-Xiaoyu
近年来，由于工业和城市化的快速发展，空气污染已成为中国最严重的环境问题。到目前为止，主要城市空气污染的确切来源尚不清楚。为了确定污染源，我们研究了杭州市2013年11月25日至12月11日期间的空气污染情况，包括8个监测站。我们分析了PM2.5，PM10，O3，NO2，CO，SO2和卫星观测气溶胶光学厚度（PM：颗粒物）。采用轨迹聚类和受体模型对污染源进行识别。结果显示，在12月3日至9日的每周重度霾事件期间，PM2.5的平均浓度为293.4 ± 103.2 μg m− 3，PM10为376.8 ± 119.4 μg m− 3，SO2为58.0 ± 37.2 μg m− 3，NO2为118.5 ± 39.3 μg m− 3，后向轨迹聚类分析表明，在每周一次的灰霾天气过程中，主要分布在南部（37.1%）和东南部（28.6%）。受体模型的结果表明，杭州市PM2. 5极高值的形成源主要位于浙闽东南沿海、江西北部和江苏中部。研究还发现，杭州市PM2. 5的高浓度和形成不是本地排放造成的，而是气团路径和跨境输送造成的。因此，有必要在地方、区域和全国范围内对所有工业区实施大气污染控制。
Air pollution has recently become China’s highest environmental issue due to the rapid development of industry and urbanization. So far, the precise sources of air pollution of main cities are unknown. To identify sources, we studied air pollution in the Hangzhou city from November 25 to December 11, 2013, at eight monitoring stations. We analyzed PM2.5, PM10, O3, NO2, CO, SO2, and satellite observations for aerosol optical thickness (PM: particulate matter). Pollution sources were identified by trajectory clustering and receptor models. The results show that during the weekly heavy haze episode, December 3–9, mean concentrations were 293.4 ± 103.2 μg m−3for PM2.5, 376.8 ± 119.4 μg m−3for PM10, 58.0 ± 37.2 μg m−3for SO2, 118.5 ± 39.3 μg m−3for NO2, and 2,429 ± 740 μg m−3for CO. The back trajectory cluster analysis indicates that the predominant clusters are south (37.1 %) and southeast (28.6 %) during the weekly heavy haze episode. The results of the receptor models show that the sources affecting formation of the extremely high PM2.5in Hangzhou are mainly located in the southeastern coast of Zhejiang and Fujian provinces, north part of Jiangxi, and central part of Jiangsu province. Rather than local emissions, it is also found that air mass pathways and cross-border transports control high PM2.5concentrations and formation in Hangzhou. Therefore, it is necessary to implement air pollution control for all industrial areas at local, regional, and national scales in China.