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|Title:||Long-term O-3-precursor relationships in Hong Kong : field observation and model simulation||Authors:||Wang, Y
|Issue Date:||2017||Publisher:||Copernicus GmbH||Source:||Atmospheric chemistry and physics, 2017, v. 17, no. 18, p. 10919-10935 How to cite?||Journal:||Atmospheric chemistry and physics||Abstract:||Over the past 10 years (2005-2014), ground-level O-3 in Hong Kong has consistently increased in all seasons except winter, despite the yearly reduction of its precursors, i.e. nitrogen oxides (NOx = NO + NO2), total volatile organic compounds (TVOCs), and carbon monoxide (CO). To explain the contradictory phenomena, an observation-based box model (OBM) coupled with CB05 mechanism was applied in order to understand the influence of both locally produced O-3 and regional transport. The simulation of locally produced O-3 showed an increasing trend in spring, a decreasing trend in autumn, and no changes in summer and winter. The O-3 increase in spring was caused by the net effect of more rapid decrease in NO titration and unchanged TVOC reactivity despite decreased TVOC mixing ratios, while the decreased local O-3 formation in autumn was mainly due to the reduction of aromatic VOC mixing ratios and the TVOC reactivity and much slower decrease in NO titration. However, the decreased in situ O-3 formation in autumn was overridden by the regional contribution, resulting in elevated O-3 observations. Furthermore, the OBM-derived relative incremental reactivity indicated that the O-3 formation was VOC-limited in all seasons, and that the long-term O-3 formation was more sensitive to VOCs and less to NOx and CO in the past 10 years. In addition, the OBM results found that the contributions of aromatics to O-3 formation decreased in all seasons of these years, particularly in autumn, probably due to the effective control of solvent-related sources. In contrast, the contributions of alkenes increased, suggesting a continuing need to reduce traffic emissions. The findings provide updated information on photochemical pollution and its impact in Hong Kong.||URI:||http://hdl.handle.net/10397/75887||ISSN:||1680-7316||EISSN:||1680-7324||DOI:||10.5194/acp-17-10919-2017||Rights:||© Author(s) 2017. This is an open access article distributed under the Creative Commons Attribution
3.0 License (https://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The following publication: Wang, Y., Wang, H., Guo, H., Lyu, X., Cheng, H., Ling, Z., Louie, P. K. K., Simpson, I. J., Meinardi, S., and Blake, D. R.: Long-term O3–precursor relationships in Hong Kong: field observation and model simulation, Atmos. Chem. Phys., 17, 10919-10935 is available at https://doi.org/10.5194/acp-17-10919-2017, 2017.
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