Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 3 2008 10.5194/acpd-8-10397-2008 http://www.atmos-chem-phys-discuss.net/8/10397/2008/ http://www.atmos-chem-phys-discuss.net/8/10397/2008/acpd-8-10397-2008.html http://www.atmos-chem-phys-discuss.net/8/10397/2008/acpd-8-10397-2008.pdf 10397 10414 2008-06-03 Variations of O₃ and CO in summertime at a rural site near Beijing Y. Wang wang3@fas.harvard.edu M. B. McElroy J. W. Munger J. Hao H. Ma C. P. Nielsen Y. Chen Department of Earth and Planetary Sciences and School of Engineering and Applied Sciences. Harvard University, Cambridge, Massachusetts, USA Department of Environmental Science and Engineering, Tsinghua Univeristy, Beijing, China Harvard China Project and School of Engineering and Applied Sciences. Harvard University, Cambridge, Massachusetts, USA 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. Andreae, M. 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