Abstract
Large day-to-day variability in O3 and CO was observed at Chongming, a remote rural site east of Shanghai, in August 2010. High ozone periods (HOPs) that typically lasted for 3–5 days with daily maximum ozone exceeding 102 ppb were intermittent with low ozone periods (LOPs) with daily maximum ozone less than 20 ppb. The correlation analysis of ozone with meteorological factors suggests that the large variations of surface ozone are driven by meteorological conditions correlated with the changes in the location and intensity of the west Pacific subtropical high (WPSH) associated with the East Asian summer monsoon (EASM). When the center of WPSH with weaker intensity is to the southeast of Chongming site, the mixing ratios and variability of surface ozone are higher. When the center of WPSH with stronger intensity is to the northeast of Chongming site, the mixing ratios and variability of surface ozone are lower. Sensitivity simulations using the GEOS-Chem chemical transport model indicate that meteorological condition associated with WPSH is the primary factor controlling surface ozone at Chongming in August, while local anthropogenic emissions make significant contributions to surface ozone concentrations only during HOP.
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Acknowledgments
This research was supported by the National Science Foundation of China (grant no. 41005060) and by the International Science & Technology Cooperation Program of China (2010DFA21300). We acknowledge the contribution of Dr. J.W. Munger for helping with the initial setup of the instruments.
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Responsible editor: Euripides Stephanou
Jingwei He, PhD candidate, School of Environment, Tsinghua University. Research interest: air pollution control. Yuxuan Wang, Associate Professor, Center for Earth System Science, Tsinghua University. Research interest: atmospheric chemistry. Jiming Hao, Professor, School of Environment, Tsinghua University. Research interest: air pollution control. Lulu Shen, Master student, Center for Earth System Science, Tsinghua University. Research interest: atmospheric chemistry. Long Wang, PhD student, School of Environment, Tsinghua University. Research interest: air pollution control.
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He, J., Wang, Y., Hao, J. et al. Variations of surface O3 in August at a rural site near Shanghai: influences from the West Pacific subtropical high and anthropogenic emissions. Environ Sci Pollut Res 19, 4016–4029 (2012). https://doi.org/10.1007/s11356-012-0970-5
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DOI: https://doi.org/10.1007/s11356-012-0970-5