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- Title
An analysis of the impacts of VOCs and NO<sub>x</sub> on the ozone formation in Guangzhou.
- Authors
Zou, Y.; Deng, X. J.; Wang, B. G.; Li, F.; Tan, H. B.; Deng, T.; Mai, B. R.; Liu, X. T.
- Abstract
In this study, online monitoring instruments were used to monitor ozone, NOx and VOCs at the Guangzhou Panyu Atmospheric Composition Station (GPACS) of the China Meteorological Administration from June 2011 to May 2012, so as to obtain their characteristic seasonal and diurnal variations, as well as the impacts of NOx and VOCs on local ozone formation and Guangzhou ozone control strategies. The results show that during the observation period the seasonal variation of ozone concentration was lower in the spring and winter and higher in the summer and autumn, which is contrary that of NOx and VOCs. At around 09:00 LT in the summer, autumn and winter, both the ozone concentration and NO2/NO ratio begin to increase, and the NO2/NO ratio reached its maximum after a peak of ozone concentration, but this variation was not particularly evident in the spring. Aromatics and alkenes are the largest components for ozone formation potential, among which aromatic toluene, m-xylene, p-xylene and 1,3,5-trimethylbenzene are the most important components, with a total contribution of about 31.6% to ozone formation potential. Through the analysis on local ozone control by the VOC/NOX ratio, it was found that when the ozone concentration reached a peak in the summer and autumn in which high concentrations of ozone were prone to occur, ozone generation was NOx limited, thus NOx emissions must be controlled to regulate the occurrence of high-concentration ozone events. In the spring and winter, ozone generation was always VOCs controlled. Due to the relatively low ozone concentration, although NOx emissions could be controlled to increase ozone concentration, high-concentration ozone events would not occur. Therefore, for the control of ozone in Guangzhou, in addition to the control of VOCs emissions, more attention must be paid to reducing NOx emissions, so as to achieve the purpose of controlling high-concentration ozone.
- Subjects
GUANGZHOU (China); VOLATILE organic compounds; NITRIC oxide; OZONE; ONLINE monitoring systems; TOLUENE; EMISSIVITY
- Publication
Atmospheric Chemistry & Physics Discussions, 2014, Vol 14, Issue 13, p18849
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-14-18849-2014