| 正矩阵因子分解法评价北京市PM10和SO2监测网络 |
| 摘要点击 2969 全文点击 3067 投稿时间：2009-04-13 修订日期：2009-05-28 |
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| 中文关键词 大气污染监测网络 优化布点 正矩阵因子分解法 PM10 SO2 |
| 英文关键词 air pollution monitoring networks optimum setting positive matrix factorization PM10 SO2 |
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| 中文摘要 |
| 为辨识北京市大气污染物变化规律相同的区域，筛选监测网络中表征冗余信息的监测点，使用正矩阵因子分解法分别对北京市PM10和SO2监测网络进行分析与评价.分析获得北京市PM10和SO2明显的季节变化特征：PM10浓度春季最高，夏季较低；SO2浓度冬季最高，夏季较低.采用正矩阵分解法对PM10监测网络解析出3个因子，对应北京市PM10污染变化特征相同的3个区域，分别为区域1代表监测点为车公庄与石景山古城，区域2代表监测点为位于城东的前门、天坛、农展馆与奥体中心，区域3代表监测点定陵.结果表明区域2监测点密度较大，存在表征冗余信息的监测点，可以考虑撤销或迁移部分监测点.对SO2监测网络解析出6个因子，分别对应北京市SO2污染变化特征相同的6个区域，代表监测点位分别为定陵、古城、东四、奥体中心、农展馆与天坛和前门与车公庄.评价结果表明北京市PM10和SO2监测网络都存在冗余信息的监测点，可以根据分区结果考虑撤销或者迁移部分监测点，优化监测网络. |
| 英文摘要 |
| The aim of this study was to identify city areas with similar air pollution characteristics and determine which sites may be providing redundant information. Positive matrix factorization(PMF) was applied in this study to assess the mass concentrations of sulfur dioxide (SO2) and particulate matter with an aerodynamic diameter less than 10 μm (PM10), collected in the air quality monitoring network in the year of 2000.The analysis indicated that there were obviously seasonal variations for PM10 and SO2 in Beijing. The PM10 concentrations were higher in spring and lower in summer, but the SO2 concentrations were higher in winter and lower in summer. The results of the PMF showed that the sites of PM10 network in Beijing could be identified as three regions, which represented city areas characterized by the same specific air pollution. These three regions represented Gucheng site/Chegongzhuang site, Qianmen site/National Olympic Sports Center site/Tiantan site /Nongzhanguan site, and Ming Tombs site, respectively. Some sites in region 2 which included four sites may be redundant and can be removed. SO 2 network can be divided into six regions including Chegongzhuang site/Qianmen site, Tiantan site/Nongzhanguan stie, Ming Tombs site, National Olympic Sports Center site, Dongsi site, and Gucheng site. It indicated that some sites in Beijing PM 10 and SO 2 monitoring networks might be redundant and could be removed or relocated to other areas. |
