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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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哈尔滨工程大学青岛创新发展基地招聘青年教师
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中国海洋大学与中国水产科学研究院 联合培养 专硕 食品加工与安全
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天津科技大学邓启良教授团队 招收2026年博士生
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【2026/2027 哈工大计算机类博士招生】
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关于本子打包
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2026年天津大学杰青团队招收化学合成、计算机和器件的方面博士
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9楼2014-01-27 00:32:40
8楼2014-01-25 10:03:42
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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
11楼2014-01-27 16:54:36