Abstract:For the purpose of discerning the contributions of various physical and chemical processes to the aerosol concentration in the atmosphere, Models-3/CMAQ modeling system has been used to study the typical aerosol pollution in autumn over Pearl River Delta (PRD), China. The simulated period was October 2012, when PRD was under the control of a high-pressure system. The wind direction switched from north-east to east when a cold font passed PRD on October 17th. It was found that PM2.5 concentration in the western part of PRD was higher than that in the eastern part, and the region of the highest concentration extended southwestward with increase in height. Influenced by planetary boundary layer height, PM2.5 was transported to higher altitudes in the daytime than in the nighttime on land. The results of process analysis showed that emission, horizontal transportation and vertical transportation were the most important processes in the variations of PM2.5 concentration near land surface. Local pollutants emission was the most important factor of rising concentration in city center (Guangzhou site), while horizontal transportation of non-local pollutants was the major source of PM2.5 in the downwind area (Jiangmen site).
刘一鸣, 洪莹莹, 张舒婷, 王雪梅, 范绍佳, 冯业荣, 樊琦. 珠江三角洲秋季典型气溶胶污染的过程分析[J]. 中国环境科学, 2014, 34(12): 3017-3025.
LIU Yi-Ming, HONG Ying-Ying, ZHANG Shu-Ting, WANG Xue-Mei, FAN Shao-Jia, FENG Ye-Rong, FAN Qi. Process analysis of typical aerosol pollution in autumn over Pearl River Delta, China. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(12): 3017-3025.