Numerical simulation of a complex pollution episode with high concentrations of PM2.5 and O3 over the Pearl River Delta region, China
LAI An-qi1, CHEN Xiao-yang1, LIU Yi-ming1, JIANG Ming2, WANG Xue-mei3, WEI Xiao-lin4, FAN Qi1
1. Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275, China;
2. Guangdong Environmental Monitoring Centre, Guangzhou 510335, China;
3. Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, China;
4. Shenzhen Meteorological Bureau, Shenzhen 518040, China
WRF-Chem model was used to analyze the characteristics and formation mechanism of a pollution episode with high concentrations of PM2.5 and O3 over the Pearl River Delta (PRD) region on October 27, 2014. It was found that the stable weather condition which was favorable for the accumulation of air pollutants occurred over the PRD region because of a high-pressure ridge in 850hPa height and a high-pressure system in the ground. The western PRD regions, including southern Zhaoqing, Foshan and northern Jiangmen, were the most polluted areas due to the easterly prevailing winds. The high O3 concentrations in southern Zhaoqing and northern Jiangmen were associated with gas phase photochemistry, while the high O3 levels in Foshan were related to physical processes. Photochemical O3 formation in areas with high O3 levels was VOCs-limited, and VOCs transported from urban centers and biogenic VOCs from local emissions in Jiangmen was conducive to photochemical O3 formation. On the other hand, the high concentration of PM2.5 was related to its high initial concentrations, as well as the high production rates of secondary inorganic aerosol (i.e., sulfates and nitrates) through the oxidation of SO2 and NO2. The increment for the concentrations of sulfates and nitrates were mainly related to local generation and regional transport, respectively.
赖安琪, 陈晓阳, 刘一鸣, 江明, 王雪梅, 魏晓琳, 樊琦. 珠江三角洲PM2.5和O3复合污染过程的数值模拟[J]. 中国环境科学, 2017, 37(11): 4022-4031.
LAI An-qi, CHEN Xiao-yang, LIU Yi-ming, JIANG Ming, WANG Xue-mei, WEI Xiao-lin, FAN Qi. Numerical simulation of a complex pollution episode with high concentrations of PM2.5 and O3 over the Pearl River Delta region, China. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4022-4031.
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