Pollution transport characteristics of Beijing - Tianjin - Hebei region and its surrounding areas in January 2019
BAI Wei-chao1, WANG Xiao-qi1, CHENG Shui-yuan1, ZHANG Zhi-da1, QI Peng1, GUAN Pan-bo2, CHEN Hao-yuan3
1. Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environment and Life Sciences, Beijing University of Technology, Beijing 100124, China; 2. The 714 Research Institute of CSIC, Beijing 100101, China; 3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Abstract：In this study, combined with atmospheric environment observation data, potential source analysis (PSCF) and concentration weight trajectory analysis (CWT), as well as transport matrix and transport flux calculation methods based on WRF-CMAQ model, were used to analyze the characteristics and causes of air pollution in typical cities in Beijing-Tianjin-Hebei in autumn and winter of 2019, and to quantitatively evaluate the characteristics and causes of air pollution in the Beijing-Tianjin-Hebei region and surrounding provinces between PM2.5 transmission contribution. The results show that the Beijing-Tianjin-Hebei region is more polluted in winter than in autumn, and PM2.5 concentration has a significant positive correlation with relative humidity and a significant negative correlation with wind speed during heavy pollution periods. The potential source regions of Typical Beijing-Tianjin-Hebei cities Beijing, Tianjin and Shijiazhuang are mainly distributed in Beijing-Tianjin-Hebei, Shanxi, central Inner Mongolia and Shandong, which is basically consistent with CWT results. In the Beijing-Tianjin-Hebei region, local emission contributed most to PM2.5 emissions. The local contribution of Beijing, Tianjin and Hebei ranged from 54.33% to 66.01%, and the contribution of transmission from outside the Beijing-Tianjin-Hebei region ranged from 0.11% to 26.54%. Transport flux results show that PM2.5 transport in winter is mainly influenced by upper-level northwest airflow, especially in clean weather, where high wind speed drives air mass inflow. In autumn, it is mainly affected by low level southeast airflow. The inflow/outflow and vertical distribution of transport flux show a non-linear response relationship with pollution level and RH. The dominant wind direction changes lead to a significantly larger transport effect before heavy pollution than during heavy pollution, and a significantly smaller transport effect in high RH than in low RH.
白伟超, 王晓琦, 程水源, 张智答, 齐鹏, 关攀博, 陈颢元. 2019年秋冬季京津冀与周边地区污染传输特征分析[J]. 中国环境科学, 2022, 42(9): 4086-4099.
BAI Wei-chao, WANG Xiao-qi, CHENG Shui-yuan, ZHANG Zhi-da, QI Peng, GUAN Pan-bo, CHEN Hao-yuan. Pollution transport characteristics of Beijing - Tianjin - Hebei region and its surrounding areas in January 2019. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4086-4099.
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