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北京雾霾研究成果在Atmospheric Chemistry and Physics发表,谁分享下啊
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每年这时候我都再仔细读一遍《范进中举》
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散金求好运
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Polymers 期刊特刊 组稿
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中科院大连化学物理研究所 招聘 催化剂研发方向 科研助理 2名
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南京大学 智能驱动与感知材料实验室 诚招申请考核博士生/科研助理/博士后
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找女友
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新审查指南施行半年,AI方向的专利申请是不是更看"技术味"了?
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出全新蔡司 Plan?APOCHROMAT 20×/0.8 平场复消色差物镜
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11楼2014-01-27 16:54:36
8楼2014-01-25 10:03:42
9楼2014-01-27 00:32:40
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小木虫: 金币+0.5, 给个红包,谢谢回帖
小木虫: 金币+0.5, 给个红包,谢谢回帖
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Atmos. Chem. Phys., 13, 7053–7074, 2013 www.atmos-chem-phys.net/13/7053/2013/ Chemical characterization and source apportionment of PM2.5 in Beijing: seasonal perspective R. Zhang1,*, J. Jing1,2,*, J. Tao3,*, S.-C. Hsu4,*, G. Wang5, J. Cao5, C. S. L. Lee6, L. Zhu3, Z. Chen7, Y. Zhao7, and Z. Shen8 Abstract. In this study, 121 daily PM2.5 (aerosol particle with aerodynamic diameter less than 2.5 μm) samples were collected from an urban site in Beijing in four months between April 2009 and January 2010 representing the four seasons. The samples were determined for various compositions, including elements, ions, and organic/elemental carbon. Various approaches, such as chemical mass balance, positive matrix factorization (PMF), trajectory clustering, and potential source contribution function (PSCF), were employed for characterizing aerosol speciation, identifying likely sources, and apportioning contributions from each likely source. Our results have shown distinctive seasonality for various aerosol speciations associated with PM2.5 in Beijing. Soil dust waxes in the spring and wanes in the summer. Regarding the secondary aerosol components, inorganic and organic species may behave in different manners. The former preferentially forms in the hot and humid summer via photochemical reactions, although their precursor gases, such as SO2 and NOx, are emitted much more in winter. The latter seems to favorably form in the cold and dry winter. Synoptic meteorological and climate conditions can overwhelm the emission pattern in the formation of secondary aerosols. The PMF model identified six main sources: soil dust, coal combustion, biomass burning, traffic and waste incineration emission, industrial pollution, and secondary inorganic aerosol. Each of these sources has an annual mean contribution of 16, 14, 13, 3, 28, and 26 %, respectively, to PM2.5. However, the relative contributions of these identified sources significantly vary with changing seasons. The results of trajectory clustering and the PSCF method demonstrated that regional sources could be crucial contributors to PM pollution in Beijing. In conclusion, we have unraveled some complex aspects of the pollution sources and formation processes of PM2.5 in Beijing. To our knowledge, this is the first systematic study that comprehensively explores the chemical characterizations and source apportionments of PM2.5 aerosol speciation in Beijing by applying multiple approaches based on a completely seasonal perspective。 |
10楼2014-01-27 10:16:30









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