| 北京市大兴区大气降尘环境磁学特征及其环境意义 |
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| 引用本文： | 田世丽,夏敦胜,余晔,王博,许淑婧.北京市大兴区大气降尘环境磁学特征及其环境意义[J].中国沙漠,2013,33(3):832-839. |
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| 作者姓名： | 田世丽 夏敦胜 余晔 王博 许淑婧 |
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| 作者单位： | 1.中国科学院寒区旱区环境科学与工程研究所, 甘肃 兰州 730000;
2.兰州大学 西部环境教育部重点实验室, 甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金项目，中国科学院"百人计划"项目 |
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| 摘 要： | 应用环境磁学方法对北京市大兴区大气降尘环境磁学特征进行了系统研究,并通过与北京市朝阳区、兰州市大气降尘环境磁学特征的对比,对环境磁学在污染物来源解析及扩散条件研究中的应用机理进行了探讨。结果表明,大兴区大气降尘磁性矿物含量明显高于本区表土,人为源影响显著;降尘样品磁学特征主要受磁铁矿控制,并含有一定数量的磁赤铁矿,磁性矿物为准单畴和多畴颗粒;大兴区降尘样品的磁性矿物含量明显低于朝阳区,且样品颗粒相对较细,表明人口密度、车流量、城市发达度对大气污染程度存在显著影响;大兴区与兰州市大气降尘磁性矿物含量的季节变化差异表明,燃煤取暖对北京大气质量的影响显著减弱,燃煤锅炉改造是大气污染防治的重要措施之一。气象因素对大气颗粒物浓度变化有重要影响,降水、低气压和高风速利于大气颗粒物的清除和扩散,低气温对大气颗粒物污染的负面影响显著。
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| 关 键 词： | 大气降尘 环境磁学 北京市大兴区 气象要素 采暖期 |
| 收稿时间： | 2012-03-30 |
| 修稿时间： | 2012-05-23 |
Magnetic Characteristics of Dustfall in Daxing District, Beijing, China and Its Environmental Implications |
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| TIAN Shi-li,XIA Dun-sheng,YU Ye,WANG Bo,XU Shu-jing.Magnetic Characteristics of Dustfall in Daxing District, Beijing, China and Its Environmental Implications[J].Journal of Desert Research,2013,33(3):832-839. |
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| Authors: | TIAN Shi-li XIA Dun-sheng YU Ye WANG Bo XU Shu-jing |
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| Institution: | 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.Ministry of Education Key Laboratory of Western Chinas Environmental System, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | We investigated the magnetic characteristics of the dustfall samples collected from Daxing District of Beijing by using the magnetic methods.Furthermore, we explored the application of environmental magnetism to the source apportionment and diffusion of pollutants based on the comparison of the magnetic analysis results to that of dustfall sampled from Chaoyang District of Beijing and Lanzhou, respectively.The results reveal that the concentration of magnetic mineral in dustfall sampled from Daxing District is much higher than that in the topsoil of the same area. The main magnetic minerals in the dustfall are magnetite and maghemite, and the main magnetic grain sizes are mainly pseudo single-domain(PSD) and multi-domain(MD). The content of magnetic mineral in dustfall sampled from Chaoyang District is much higher than that from Daxing District, which implies that air pollution was significantly affected by population density, traffic condition and the urbanization level. The seasonal variability of the content of magnetic mineral in dustfall sampled from Daxing District and Lanzhou indicates that the air quality of Beijing has been improved by the reduced impacts of coal-firing. Inferred from meteorological data, we found that local precipitation, low pressure and high wind speed were conducive to the removal as well as diffusion of atmospheric particulate matter, while low temperature has a significant negative impact on that. |
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| Keywords: | dustfall environmental magnetism Daxing District of Beijing meteorological elements heating period |
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