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Investigation of Particulate Matter Regional Transport in Beijing Based on Numerical Simulation
Jianjun He1,2, Hongjun Mao2, Sunling Gong1, Ye Yu3, Lin Wu2, Hongli Liu1, Ying Chen4, Boyu Jing2, Peipei Ren2, Chao Zou2
1 State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
2 The College of Environmental Science & Engineering, Nankai University, Tianjin 300071, China
3 Clod & Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
4 Leibniz-Institute for Tropospheric Research, Leipzig 04318, Germany
- Regional transport closely relates with meteorology and emission source.
- Regional transport contributes 53 and 36% of PM in July and December 2013 in Beijing.
- The transport of PM in Beijing is mostly from Hebei and Tianjin.
- The rate of secondary aerosol is affected significantly by regional transport.
The frequent occurrence of regional air pollution makes it challenging to control. Based on source sensitivity research performed with the Chinese Unified Atmospheric Chemistry Environment (CUACE) model and dispersion simulation performed with the Flexible Particle dispersion model (FLEXPART), the regional transport of particulate matter (PM), potential source regions, and transport pathways were investigated for Beijing in summer (July) and winter (December) 2013. The mean near-surface trans-boundary contribution ratio (TBCR) of PM2.5 in Beijing was 53.4% and 36.1% in summer and winter 2013, respectively, and 51.8% and 35.1% for PM10. Regional transport in summer was more significant than that in winter. Seasonal difference of meteorological condition combined with the distribution of emission is responsible for seasonal difference of TBCR. The secondary aerosol is mostly contributed by regional transport. The transport of PM is mostly from Hebei province and Tianjin municipality. Based on backward trajectories analysis, the air mass source occurred from different directions in summer, while occurred from northwest in winter. The pollution level and the TBCR were closely related to the transport pathways and distance, especially in summer.
Regional transport; Particulate matter; Backward trajectory; CUACE; FLEXPART.