Ground-level ozone in the Pearl River Delta region: Analysis of data from a recently established regional air quality monitoring network |
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| Authors: | Junyu Zheng Liuju Zhong Tao Wang Peter KK Louie Zhicheng Li |
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| Institution: | 1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China;2. Chengdu Academy of Environmental Sciences, Chengdu, China;3. Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, 100871, Beijing, China;1. Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, China;2. Jiangsu Provincial Collaborative Innovation Center for Climate Change, Nanjing, China;3. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong;4. Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China;5. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China;1. Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China;2. Laboratoire d''Aérologie, Centre National de la Recherche Scientifique, Toulouse, France;1. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;2. Key Lab of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, Ningbo 315830, China;3. University of Chinese Academy of Sciences, Beijing, China;4. Environment Monitoring Center of Ningbo, Ningbo 315012, China |
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| Abstract: | The ambient air quality monitoring data of 2006 and 2007 from a recently established Pearl River Delta (PRD) regional air quality monitoring network are analyzed to investigate the characteristics of ground-level ozone in the region. Four sites covering urban, suburban, rural and coastal areas are selected as representatives for detailed analysis in this paper. The results show that there are distinct seasonal and diurnal cycles in ground-level ozone across the PRD region. Low ozone concentrations are generally observed in summer, while high O3 levels are typically found in autumn. The O3 diurnal variations in the urban areas are larger than those at the rural sites. The O3 concentrations showed no statistically significant difference between weekend and weekdays in contrast to the findings in many other urban areas in the world. The average ozone concentrations are lower in urban areas compared to the sites outside urban centers. Back trajectories are used to show the major air-mass transport patterns and to examine the changes in ozone from the respective upwind sites to a site in the center of the PRD (Wanqingsha). The results show higher average ozone concentrations at the upwind sites in the continental and coastal air masses, but higher 1 h-max O3 concentrations (by 8–16 ppbv) at the center PRD site under each of air-mass category, suggesting that the ozone pollution in the PRD region exhibits both regional and super-regional characteristics. |
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