Atmos. Chem. Phys. Discuss., 7, 14707-14745, 2007
© Author(s) 2007. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Volatile Organic Compound (VOC) measurements in the Pearl River Delta (PRD) region, China
Y. Liu1, M. Shao1, S. H. Lu3, C.-C. Chang2, J.-L. Wang3, and G. Chen4
1State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
2Res. Center of Environment Change, Academia Sinica, Nankang, Taipei 115, Taiwan, China
3Department of Chemistry, National Central University, Chungli 320, Taiwan, China
4NASA Langley Research Center, Hampton, VA 23681, USA

Abstract. We measured levels of ambient volatile organic compounds (VOCs) at seven sites in the Pearl River Delta (PRD) region of China during the Air Quality Monitoring Campaign spanning 4 October to 3 November 2004. Two of the sites, Guangzhou (GZ) and Xinken (XK), were intensive sites at which we collected multiple daily canister samples. The observations reported here provide a look at the VOC distribution, speciation, and photochemical implications in the PRD region. Alkanes constituted the largest percentage (>40%) in mixing ratios of the quantified VOCs at six sites; the exception was one major industrial site that was dominated by aromatics (about 52%). Highly elevated VOC levels occurred at GZ during two pollution episodes; however, the chemical composition of the VOCs did not exhibit noticeable changes during these episodes, except that the fraction of aromatics was about 10% higher. We calculated the OH loss rate to estimate the chemical reactivity of all VOCs. Of the anthropogenic VOCs, alkenes played a predominant role in VOC reactivity at GZ, whereas the contributions of reactive aromatics were more important at XK. Our preliminary analysis of the VOC correlations suggests that the ambient VOCs at GZ came directly from local sources (i.e., automobiles); those at XK were influenced by both local emissions and transportation of air mass from upwind areas.

Citation: Liu, Y., Shao, M., Lu, S. H., Chang, C.-C., Wang, J.-L., and Chen, G.: Volatile Organic Compound (VOC) measurements in the Pearl River Delta (PRD) region, China, Atmos. Chem. Phys. Discuss., 7, 14707-14745, doi:10.5194/acpd-7-14707-2007, 2007.
Search ACPD
Discussion Paper
    Final Revised Paper