Atmos. Chem. Phys. Discuss., 8, 10397-10414, 2008
www.atmos-chem-phys-discuss.net/8/10397/2008/
doi:10.5194/acpd-8-10397-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Variations of O3 and CO in summertime at a rural site near Beijing
Y. Wang1,2, M. B. McElroy1, J. W. Munger1, J. Hao2, H. Ma2, C. P. Nielsen3, and Y. Chen2
1Department of Earth and Planetary Sciences and School of Engineering and Applied Sciences. Harvard University, Cambridge, Massachusetts, USA
2Department of Environmental Science and Engineering, Tsinghua Univeristy, Beijing, China
3Harvard China Project and School of Engineering and Applied Sciences. Harvard University, Cambridge, Massachusetts, USA

Abstract. Large intra-season differences in concentrations of CO and O3 ([CO], [O3]) were detected at Miyun, a rural site north of Beijing, in summer 2006. Despite an increase in mean daytime [CO] from 500 ppbv in June to 700 ppbv in July, mean daytime [O3] dropped from 67 ppbv in June to 50 ppbv in July and August. The observed changes in CO and O3 are attributed to the influence of the summer monsoonal circulation that develops over the North China Plain in July. Photochemical production of O3 is reduced as a consequence of increased cloudiness during July and August, as indicated by the strong negative correlation observed between [O3] and satellite observations of cloud optical depth, with cloudiness having little effect on CO. The analysis suggests a strategy for emission controls that could be implemented in an economically efficient manner to minimize the frequency of high levels of O3 during summer in Beijing.

Citation: Wang, Y., McElroy, M. B., Munger, J. W., Hao, J., Ma, H., Nielsen, C. P., and Chen, Y.: Variations of O3 and CO in summertime at a rural site near Beijing, Atmos. Chem. Phys. Discuss., 8, 10397-10414, doi:10.5194/acpd-8-10397-2008, 2008.
 
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