# Variations of $$O_3$$ and CO in Summertime at a Rural Site Near Beijing

 Title: Variations of $$O_3$$ and CO in Summertime at a Rural Site Near Beijing Author: Wang, Yuxuan; McElroy, Michael Brendon; Munger, J. William; Hao, Jiming; Ma, Hong; Nielsen, Chris; Chen, Yaosheng Note: Order does not necessarily reflect citation order of authors. Citation: Wang, Y., Michael B. McElroy, WIlliam J. Munger, Jiming Hao, Hong Ma, Chris P. Nielsen, and Yaosheng Chen. 2008. Variations of $$O_3$$ and CO in summertime at a rural site near Beijing. Atmospheric Chemistry and Physics 8(21): 6355-6363. Full Text & Related Files: Wang_VariationsO3.pdf (466.5Kb; PDF) Abstract: Large intra-season differences in mixing ratios of CO and $$O_3$$ 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 $$O_3$$ dropped from 67 ppbv in June to 50 ppbv in July and August. The observed changes in CO and $$O_3$$ are attributed to the influence of the summer monsoonal circulation that develops over the North China Plain in July. Photochemical production of $$O_3$$ is reduced as a consequence of increased cloudiness during July and August, as indicated by the strong negative correlation observed between $$O_3$$ 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 $$O_3$$ during summer in Beijing. Published Version: doi:10.5194/acp-8-6355-2008 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10029443

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Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University