Long term characteristics and potential sources of PM2.5 in Rizhao City from 2015 to 2019
WANG Zhong-jie1,2,3, HUO Juan2, DU Hui-yun1, WANG Da-wei1,4, LI Jie1,3,4, ZHANG Chuan-bing5, ZHANG Tao6, WANG Wei7, WANG Hai-bo1,3, YANG Wen-yi1,4
1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China; 4. CAS Center for Excellence in Regional Atmospheric Environment, Xiamen 361021, China; 5. Rizhao Environmental Monitoring Centre, Rizhao 276800, China; 6. Rizhao Eco Environmental Protection Service Centre, Rizhao 276800, China; 7. China National Environmental Monitoring Centre, Beijing 100012, China
Abstract:Based on the hourly data of PM2.5 concentrations and meteorological elements in Rizhao City during 2015 to 2019, the seasonal characteristics of PM2.5 and its relationship with wind speed and wind direction were analyzed. Also, the characteristics of sea-land in Rizhao City were summarized. Combined with HYSPLIT model and GDAS data, the 48h backward trajectories of PM2.5 concentrations at 02:00, 08:00, 14:00 and 20:00 (BTC) every day in five years were calculated. The main transport pathways and potential source contribution of PM2.5 concentrations in different seasons were discussed by cluster analysis and potential source contribution analysis. The influence of sea-land wind on pollutants in Rizhao City was also analyzed. The results showed that the seasonal characteristics of PM2.5 concentrations in Rizhao City was the highest in winter and the lowest in summer. The particles concentrations of the monitoring station is higher under the influence of northwest wind. There are differences in the main transport routes in different seasons in Rizhao:in spring, it is mainly affected by the easterly and northerly airflow; in summer, it is mainly affected by the cleaner easterly airflow from the sea under the influence of subtropical high system; in autumn, it is mainly affected by the northwest and easterly airflow; in winter, it is mainly affected by the northwest and northerly airflow. On the whole, the PM2.5 concentrations of Rizhao City is higher in different seasons affected by the westerly to southerly airflow. The sea-land wind days are more in spring and autumn,less in summer and winter. Under the influence of sea-land wind, the PM2.5 and ozone pollution in Rizhao City present different distribution characteristics, and under different PM2.5 pollution levels, the daily variation characteristics of PM2.5 concentrations are also different from those in normal days.The results show that the main potential source areas of Rizhao are Linyi City, Weifang City, Qingdao city and Lianyungang City of Jiangsu Province.
王中杰, 霍娟, 杜惠云, 王大玮, 李杰, 张传兵, 张涛, 王威, 王海波, 杨文夷. 2015~2019年日照市PM2.5长期变化特征及其潜在源区分析[J]. 中国环境科学, 2021, 41(9): 3969-3980.
WANG Zhong-jie, HUO Juan, DU Hui-yun, WANG Da-wei, LI Jie, ZHANG Chuan-bing, ZHANG Tao, WANG Wei, WANG Hai-bo, YANG Wen-yi. Long term characteristics and potential sources of PM2.5 in Rizhao City from 2015 to 2019. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 3969-3980.
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