[Characteristics of Surface Ozone and Impact Factors at Different Station Types During the Autumn in Guangzhou]

Ping Gao; Li-Yue Zhuang; Long Wang; Yu-Ping Chen; Hui Yan; Jin Shen; Li-Ya Fan; Dai-Qi Ye

doi:10.13227/j.hjkx.202002097

[Characteristics of Surface Ozone and Impact Factors at Different Station Types During the Autumn in Guangzhou]

Huan Jing Ke Xue. 2020 Aug 8;41(8):3527-3538. doi: 10.13227/j.hjkx.202002097.

[Article in Chinese]

Authors

Ping Gao¹, Li-Yue Zhuang¹, Long Wang², Yu-Ping Chen¹, Hui Yan¹, Jin Shen³, Li-Ya Fan^{1

4

5

6}, Dai-Qi Ye^{1

4

5

6}

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² Guangdong Province Academy of Environmental Science, Guangzhou 510045, China.
³ Guangdong Environmental Monitoring Center, Guangzhou 510308, China.
⁴ National Engineering Laboratory for Volatile Organic Compounds Pollution Control Technology and Equipment, Guangzhou 510006, China.
⁵ Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, China.
⁶ Guangdong Provincial Environmental Risk Control and Emergency Disposal Engineering Technology Research Center, Guangzhou 510006, China.

PMID: 33124325
DOI: 10.13227/j.hjkx.202002097

Abstract

Surface ozone (O₃) has become the primary air pollutant in Guangzhou. Due to the influences of topography, meteorological conditions, and differences in precursor emissions, there are also large differences in the characteristics, formation mechanisms, and influencing factors of ozone in different areas of the same city. Based on the ground measurement data for October 2015 at four air quality monitoring stations that represent different types of regions in Guangzhou [urban area:Guangzhou Monitoring Center (GMC); upwind suburbs:Huadu Normal School (HNS); downwind suburbs:Panyu Middle School (PMS); Mountain area:Maofengshan (MFS)] and the WRF simulated meteorological data, the changing characteristics, influencing factors, and sensitivity of O₃ were studied at each station. The results showed that the diurnal variation of O₃ and NO_x exhibit unimodal and bimodal characteristics (except for NO_x at the MFS station). The peak ozone concentration appeared on Saturday at the GMC, HNS, and MFS stations, and on Thursday at the PMS station. The ozone concentration at the MFS station was the highest (98.61 μg·m^-3), whereas that at the GMC station was the lowest (44.83 μg·m^-3). The NO_x inflection point intervals for O₃ at different sites were:GMC:55-90 μg·m^-3; PMS:30-60 μg·m^-3; MFS:10-20 μg·m^-3. The temperature inflection point intervals affecting the rate of O₃ formation at different sites were:GMC:28-30℃; HNS:26-28℃; PMS:24-26℃; however, this was not obvious at the MFS station. The relative humidity inflection point intervals were:GMC:55%-65% ; HNS and PMS:60%-70% ; MFS:80%-85%. The wind speed(WS) of the light wind type was proportional to the O₃ concentration. The O₃ concentration at the PMS site was the highest in the northwest wind direction, and the O₃ concentration at the MFS site was the highest in the other wind directions. By analyzing the multivariate linear fitting of impact factors on the O₃ concentration, the main controlling factors at each site were:GMC:WS and T; PMS and HNS:T and RH; MFS:RH and WS. The ozone sensitivity at each site was as follows:GMC and HNS had a VOCs-limited regime, MFS had a NO_x-limited regime, and PMS had a transition regime.

Keywords: Guangzhou; meteorological factors; mountain site; nitrogen oxides; suburban site; surface ozone; urban site.

MeSH terms

Air Pollutants* / analysis
Cities
Environmental Monitoring
Ozone* / analysis
Seasons

Substances

Air Pollutants
Ozone