التفاصيل البيبلوغرافية
| العنوان: |
Quantitative evaluation of emission controls on primary and secondary organic aerosol sources during Beijing 2008 Olympics. |
| المؤلفون: |
Guo, S., Hu, M., Guo, Q., Zhang, X., Schauer, J. J., Zhang, R. |
| المصدر: |
Atmospheric Chemistry & Physics; 2013, Vol. 13 Issue 16, p8303-8314, 12p, 4 Charts, 2 Graphs |
| مصطلحات موضوعية: |
QUANTITATIVE chemical analysis, EMISSIONS (Air pollution), ATMOSPHERIC aerosols, ATMOSPHERIC models, PARTICULATE matter, ORGANIC compounds & the environment |
| مصطلحات جغرافية: |
BEIJING (China), CHINA |
| مستخلص: |
To assess the primary and secondary sources of fine organic aerosols after the aggressive implementation of air pollution controls during the 2008 Beijing Olympic Games, 12 h PM2.5 values were measured at an urban site at Peking University (PKU) and an upwind rural site at Yufa during the CAREBEIJING-2008 (Campaigns of Air quality REsearch in BEIJING and surrounding region) summer field campaign. The average PM2.5 concentrations were 72.5±43.6 μgm-3 and 64.3±36.2 μgm-3 (average ±standard deviation, below as the same) at PKU and Yufa, respectively, showing the lowest concentrations in recent years. Combining the results from a CMB (chemical mass balance) model and secondary organic aerosol (SOA) tracer-yield model, five primary and four secondary fine organic aerosol sources were compared with the results from previous studies in Beijing. The relative contribution of mobile sources to PM2.5 concentrations was increased in 2008, with diesel engines contributing 16.2±5.9% and 14.5±4.1% and gasoline vehicles contributing 10.3±8.7% and 7.9±6.2% to organic carbon (OC) at PKU and Yufa, respectively. Due to the implementation of emission controls, the absolute OC concentrations from primary sources were reduced during the Olympics, and the contributions from secondary formation of OC represented a larger relative source of fine organic aerosols. Compared with the non-controlled period prior to the Olympics, primary vehicle contributions were reduced by 30% at the urban site and 24% at the rural site. The reductions in coal combustion contributions were 57% at PKU and 7% at Yufa. Our results demonstrate that theemission control measures implemented in 2008 significantly alleviated the primary organic particle pollution in and around Beijing. However, additional studies are needed to provide a more comprehensive assessment of the emission control effectiveness on SOA formation. [ABSTRACT FROM AUTHOR] |
|
Copyright of Atmospheric Chemistry & Physics is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder