Analysis on the evolution of PM2.5 heavy air pollution process in Qingdao
ZHANG Qiang1, XUE Di1, WANG Shuang1, WANG Lin-hui1, WANG Jing3, MA Yan4, LIU Xiao-huan1,2
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;
2. Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
3. Qingdao Environment Monitoring Center, Qingdao 266003, China;
4. Qingdao Meteorological Administration, Qingdao 266003, China
WRF-CMAQ model was used to simulate a severe PM2.5 pollution episode in Qingdao from 1 to 7 January, 2016, and the major factors influencing the formation, persistence and removal of the severe PM2.5 pollution were analyzed. The model reasonably reproduced the temporal and spatial variation of PM2.5 concentration and meteorological conditions. Under the influence of persistent southwest airflow during the severe pollution formation period, PM2.5 and its precursors were transported to Qingdao from the South of Shandong, Anhui and Jiangsu province. These pollutants continued to accumulate in Qingdao due to the favorable meteorological conditions such as the occurrence of inversion layer and reduced planetary boundary layer height. PM2.5 and its precursors transported to Qingdao area from the Beijing-Tianjin-Hebei region and the Northwestern Shandong during the severe pollution persistence period, which originated from the Southwestern Shandong, north of Anhui and east of Henan province. In addition, numerous secondary aerosols were formed during the aqueous phase chemistry process, leading to persistently high PM2.5 concentration of more than 200μg/m3. During the severe pollution removal period, the wind speed was increased and thus enhancing the horizontal transport, the PM2.5 was transported to the downwind areas. Regional transport was a major contributor to the severe PM2.5 pollution, accounting for 87.0%, 68.5% and 57.6% during the three periods, respectively.
张强, 薛迪, 王爽, 王林慧, 王静, 马艳, 刘晓环. 青岛市PM2.5重污染天气演变过程分析[J]. 中国环境科学, 2017, 37(10): 3623-3635.
ZHANG Qiang, XUE Di, WANG Shuang, WANG Lin-hui, WANG Jing, MA Yan, LIU Xiao-huan. Analysis on the evolution of PM2.5 heavy air pollution process in Qingdao. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3623-3635.
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