ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-6355-2008 Variations of O<sub>3</sub> and CO in summertime at a rural site near Beijing Wang Y. 1 2 McElroy M. B. 2 Munger J. W. 2 Hao J. 1 Ma H. 1 Nielsen C. P. 3 Chen Y. 1 Department of Environmental Science and Engineering, Tsinghua University, Beijing, China Department of Earth and Planetary Sciences and School of Engineering and Applied Sciences, Harvard Univ., Cambridge, Massachusetts, USA Harvard China Project and School of Engineering and Applied Sciences, Harvard Univ., Cambridge, Massachusetts, USA 05 11 2008 8 21 6355 6363 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/6355/2008/acp-8-6355-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/6355/2008/acp-8-6355-2008.pdf

Large intra-season differences in mixing ratios of CO and O<sub>3</sub> were detected at Miyun, a rural site north of Beijing, in summer 2006. Despite an increase in mean daytime mixing ratio of CO from 500 ppbv in June to 700 ppbv in July, mean daytime O<sub>3</sub> dropped from 67 ppbv in June to 50 ppbv in July and August. The observed changes in CO and O<sub>3</sub> are attributed to the influence of the summer monsoonal circulation that develops over the North China Plain in July. Photochemical production of O<sub>3</sub> is reduced as a consequence of increased cloudiness during July and August, as indicated by the strong negative correlation observed between O<sub>3</sub> 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 O<sub>3</sub> during summer in Beijing.

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