HR: 17:12h
AN: A14A-06    [Abstracts]
TI: Characterization and Distribution of Hydrocarbons in Chinese Urban Air
AU: * Barletta, B
EM: bbarlett@uci.edu
AF: University of California, Irvine, Department of Chemistry 570 Rowland Hall , Irvine, CA 92697-2025 United States
AU: Meinardi, S
EM: smeinard@uci.edu
AF: University of California, Irvine, Department of Chemistry 570 Rowland Hall , Irvine, CA 92697-2025 United States
AU: Rowland, F S
EM: rowland@uci.edu
AF: University of California, Irvine, Department of Chemistry 570 Rowland Hall , Irvine, CA 92697-2025 United States
AU: Blake, D R
EM: drblake@uci.edu
AF: University of California, Irvine, Department of Chemistry 570 Rowland Hall , Irvine, CA 92697-2025 United States
AU: Chan, C
EM: cececychan@polyu.edu.hk
AF: Hong Kong Polytechnic University, Department of Civil & Structural Engineering, Hong Kong, NA Hong Kong
AU: Wang, X
EM: wangxm@gig.ac.cn
AF: Chinese Academy of Science, State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Guangzhou, 510640 China
AU: Zou, S
EM: ceszsc@zsu.edu.cn
AF: Zhongshan University, Department of Chemistry, Guangzhou, 510275 China
AU: Chan, L
EM: celychan@poly.edu.hk
AF: Hong Kong Polytechnic University, Department of Civil & Structural Engineering, Hong Kong, NA Hong Kong
AB: Air samples were collected in 53 different Chinese cities and analyzed for non methane hydrocarbons (NMHC), halocarbons and alkyl nitrates. In order to identify the main sources of the hydrocarbons, cross correlations with ethyne (C2H2) were investigated together with the difference in hydrocarbon composition in different regions of China. Most of the identified NMHCs show a good correlation with C2H2 (R2 $>$ 0.6) suggesting that their primary source is combustion. Some alkanes (mainly short chain linear alkanes), isoprene and toluene showed a lack of correlation with C2H2 suggesting additional sources of these gases. Several source samples were collected to better characterize the composition of fuel such as liquefied petroleum gas (LPG), natural gas and gasoline specifically used in China. The different distribution in mixing ratio throughout the country was also investigated. The lowest mixing ratios were always observed in the less developed and industrialized western provinces of Qinghai (Golmud city) and XinJiang (Urumqi and HaMi), while the highest mixing ratios were measured in the north eastern region, (Beijing and Taiyuan), in the central region (Chongqing and Lanzhou) and in the south eastern region (Suizhou, Changsha and Nanchang). Toluene was also significantly enhanced in the Pearl River Delta region (PRD) in the Guangdong province.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting