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How the OH reactivity affects the ozone production efficiency: case studies in Beijing and Heshan, China

Yang, Yudong and Shao, Min and Keßel, Stephan and Li, Yue and Lu, Keding and Lu, Sihua and Williams, Jonathan and Zhang, Yuanhang and Zeng, Liming and Nölscher, Anke C. and Wu, Yusheng and Wang, Xuemei and Zheng, Junyu (2017) How the OH reactivity affects the ozone production efficiency: case studies in Beijing and Heshan, China. Atmospheric Chemistry and Physics, 17 (11). pp. 7127-7142. ISSN 1680-7324.

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Total OH reactivity measurements were conducted on the Peking University campus (Beijing) in August 2013 and in Heshan (Guangdong province) from October to November 2014. The daily median OH reactivity was 20 ± 11 s^(−1) in Beijing and 31 ± 20 s^(−1) in Heshan, respectively. The data in Beijing showed a distinct diurnal pattern with the maxima over 27 s^(−1) in the early morning and minima below 16 s^(−1) in the afternoon. The diurnal pattern in Heshan was not as evident as in Beijing. Missing reactivity, defined as the difference between measured and calculated OH reactivity, was observed at both sites, with 21 % missing reactivity in Beijing and 32 % missing reactivity in Heshan. Unmeasured primary species, such as branched alkenes, could contribute to missing reactivity in Beijing, especially during morning rush hours. An observation-based model with the RACM2 (Regional Atmospheric Chemical Mechanism version 2) was used to understand the daytime missing reactivity in Beijing by adding unmeasured oxygenated volatile organic compounds and simulated intermediates of the degradation from primary volatile organic compounds (VOCs). However, the model could not find a convincing explanation for the missing reactivity in Heshan, where the ambient air was found to be more aged, and the missing reactivity was presumably attributed to oxidized species, such as unmeasured aldehydes, acids and dicarbonyls. The ozone production efficiency was 21 % higher in Beijing and 30 % higher in Heshan when the model was constrained by the measured reactivity, compared to the calculations with measured and modeled species included, indicating the importance of quantifying the OH reactivity for better understanding ozone chemistry.

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Additional Information:© 2017 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Received: 23 Jun 2016 – Discussion started: 15 Jul 2016. Revised: 14 Apr 2017 – Accepted: 19 Apr 2017 – Published: 15 Jun 2017. This study was funded by the National Key Research and Development Plan (grant no. 2016YFC020200), Natural Science Foundation for Outstanding Young Scholars (grant no. 41125018) and a Natural Science Foundation key project (grant no. 411330635). The research was also supported by the European Commission Partnership with China on Space Data (PANDA project). The authors give special thanks to Jing Zheng, Mei Li and Yuhan Liu from Peking University and Tao Zhang from the Guangdong Environmental Monitoring Center for their help and give thanks to William C. Kuster from the NOAA Earth System Research Laboratory for the branched-alkene data from 2005. The authors declare that they have no conflict of interest.
Funding AgencyGrant Number
National Key Research and Development Plan2016YFC020200
National Natural Science Foundation of China41125018
National Natural Science Foundation of China411330635
European Commission Partnership with China on Space DataUNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20170706-134121932
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Official Citation:Yang, Y., Shao, M., Keßel, S., Li, Y., Lu, K., Lu, S., Williams, J., Zhang, Y., Zeng, L., Nölscher, A. C., Wu, Y., Wang, X., and Zheng, J.: How the OH reactivity affects the ozone production efficiency: case studies in Beijing and Heshan, China, Atmos. Chem. Phys., 17, 7127-7142,, 2017
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78816
Deposited By: Tony Diaz
Deposited On:06 Jul 2017 21:12
Last Modified:03 Oct 2019 18:12

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