Meteorological and pollution characteristics under atmospheric circulation types in autumn and winter in Beijing
LIN Ting-kun1, HONG Li-nan1,2, HUANG Zheng-chao1,3, WANG Xue-song1, CAI Xu-hui1
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;
2. Tianjin Environmental Protection Bureau, Tianjin 300191, China;
3. Center for Environmental Education and Communications of Ecology and Ministry of Environment, Beijing 100020, China
The ground and vertical meteorological characteristics associated with 11atmospheric circulation types during autumns and winters (Nov.-Feb., 2013~2018) in Beijing was summarized. The circulation types were classified into five categories, and the influence of each category on the transport of air pollution as well as fine particulate matter (PM2.5) pollution was discussed. Among five categories, Category I (including north (N) and northeast (NE) circulation types, which accounted for 28% of days) and Category Ⅱ (including northwest (NW) and anticyclone (A), which accounted for 33%) were favorable for air pollution diffusion, which were characterized by the dominant northwest winds with steady direction and high speed, as well as high planetary boundary layer (PBL) height. Category Ⅲ (including East (E), 7%) was dominated by southeast winds with variable directions and moderate speed within PBL, and provided moderate conditions for air pollution diffusion. Category IV (including southwest (SW), west (W) and south (S), 12%) and Category V (including southeast (SE), uniform pressure fields(UM) and cyclone (C), 20%) were unfavorable for air pollution diffusion, which were characterized by the dominant south winds with low speed within PBL, as well as the low PBL height due to strong temperature inversion in low atmosphere. The wind direction near ground was usually steady under Category IV, while varied greatly under Category V. The transport pathways of the air mass arriving in Beijing under different circulation types showed significant difference, thus, resulted in the changing of potential source regions contributing to air pollution in Beijing. PM2.5 pollution was closely related to the atmospheric circulation types in autumn and winter in Beijing. PM2.5 pollution was most likely to occur under the types of SW, UM, C, S and W (the average frequency of pollution is larger than 75%, the average frequency of severe pollution is larger than 42%), while the types of N, A, NE and NW were associated with low frequency of occurrence of PM2.5 pollution. A higher proportion of the UM type was usually observed in the months with extremely severe PM2.5 pollutions, while the proportion of the N type nearly doubled in the months with the lowest PM2.5 level. In addition, the change of PM2.5 concentrations sometimes lagged behind the change of circulation types.
林廷坤, 洪礼楠, 黄争超, 王雪松, 蔡旭晖. 北京市秋冬季大气环流型下的气象和污染特征[J]. 中国环境科学, 2019, 39(5): 1813-1822.
LIN Ting-kun, HONG Li-nan, HUANG Zheng-chao, WANG Xue-song, CAI Xu-hui. Meteorological and pollution characteristics under atmospheric circulation types in autumn and winter in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1813-1822.
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