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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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回复此楼» 抢金币啦！回帖就可以得到:
结构动力学与结构健康监测方向欧盟玛丽居里全奖博士招聘
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西北工业大学民航学院招博士与硕士复合材料方向
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中国石油大学（北京）国家级大人才团队博士招生2名：化学、材料、石油工程：油田化学
+2/69
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娃娃们今儿考试喽。。。。
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时隔多年再次回到小木虫，有一番感慨
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香港科技大学计算物理及流体力学课题组招收全奖博士后及博士生（2026年9月入学）
+1/46
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江西理工大学 稀土学院 稀土功能材料方向 招收2026届博士研究生、硕士研究生
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南方医科大学生物医学工程学院招收申请考核制博士生2名、博士后2名（2026）
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武汉工程大学绿碳技术与智能材料课题组诚招2026年博士研究生
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西班牙巴塞罗那访学、博后、留学互动
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中山大学柔性电子学院黄维院士团队诚招柔性可穿戴电子方向博士生（2026年9月入学）
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青岛大学招收少数民族【少干计划】生物与医药博士研究生
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加氢裂化
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中山大学柔性电子学院黄维院士团队诚招博士后(柔性可穿戴电子或相关方向)
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招聘农用化学产品销售一名，须具备良好的英语口语，以便拓展海外市场。
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海南大学化学院—功能分子器件团队2026博士/研究助理招生+博士后招聘
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复旦大学化学系凡勇教授/张凡教授团队招聘博士后
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生信（包括AI）博后招聘（3名）：美国德州理工大学健康科学中心
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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
11楼2014-01-27 16:54:36