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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:
求助2013年-2011年，武汉哪所学校的实验室合成过单价3万/克（或毫升）的剧毒成品？
+5/3250
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求助2013年-2011年，武汉哪所学校的实验室合成过单价3万/克（或毫升）的剧毒成品？
+5/2395
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今年面上没有消息，想来是没了，散个金攒攒人品，为明年祈福
+1/614
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药化高级研究员
+1/91
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实验室用简易工装、夹具、模具、测试板
+1/82
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★★★中山大学（深圳）院士团队招收27届推免硕士生（低维材料与器件方向）
+1/80
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华东理工大学 生物工程学院 生物反应器工程国家重点室 博士后招聘
+1/79
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山东第一医科大学医工交叉团队2025年招收纳米医学、药物化学等领域副教授、博士后
+1/74
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没基金，自费做nature课题值得吗?
+1/44
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西湖大学拓扑光学、非厄米光学、太赫兹方向博士后招聘（长期有效）
+5/35
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大连理工大学化学学院界面介导黏附与组装课题组招收2027级推免生/考研生
+1/30
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厦门大学化学化工学院廖洪钢课题组招聘助理1名（全职）
+1/27
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直博夏令营--北京理工大学/国家人工智能学院AI交叉学科联合招生
+1/22
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招生宣讲会倒计时！7月29日20：00，不见不散！
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四川大学周加境课题组招博士研究生/研究助理（自组装材料/生物医学方向）
+1/6
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多本Scopus收录国际英文期刊征稿，全免 APC！含医学期刊
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分不清 EI 会议 CA 和 JA？90% 投稿人踩过的检索大坑
+1/4
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浙江大学王宇课题组诚聘博士后/博士研究生/科研助理（招聘长期有效）
+1/3
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有没有管理类博士招生
+1/2
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肠道再生的"隐形推手"
+1/1
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