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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:
供应德国EXAKT艾卡特半导体导热散热材料三辊研磨机50 PLUS
+1/84
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南京理工大学曾海波/李伟金 招聘博士后（电磁响应：介电调控等方向）
+1/75
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澳门大学智慧城市物联网国重“结构智能感知、健康监测与无损检测”研究方向博士后招聘
+1/73
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内蒙古大学能源材料化学研究院招聘2026年博士生
+1/73
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北京-89175-事业单位-诚征女友
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真诚找对象
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山东征女友，坐标济南
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坐标济南，山东农科院招 有机合成 or 药物化学 联培硕士研究生
+1/37
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上海科技大学物质科学与技术学院｜王平鸾课题组联合招聘博士后
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可以用同一个研究内容申请青C和博士后面上吗
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杨老师招收联合培养硕士、博士生或客座学生
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SCI，计算机相关可以写
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都柏林大学(UCD)机械工程博士后招聘启事
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长江学者团队招聘药学/生物信息学等方向高校教师7名(地点杭州、有事业编)+博后5名
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重庆医科大学-药学院-新靶标教育部医药基础研究创新中心-药物化学2026年博士招生
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河南师范大学科研助理岗位招聘
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中国科学院大学-杨晗课题组-诚聘-博士后、副研究员
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浙江大学傅杰团队(杰青)高薪招聘博士后
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液晶拓扑光子学博士招生（电子科技大学）
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北京工业大学材料学院吴玉锋教授、王长龙研究员招收博士研究生
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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