WRF-CAMx modeling system was developed to examine the regional transportation of PM2.5 and secondary inorganic aerosol (SIA) in Beijing-Tianjin-Hebei (BTH) and its surrounding provinces. Regional emission contribution to the PM2.5 and SIA of BTH was estimated, and the transmission matrix among different provinces was also obtained. Results showed that regional transmission effect of PM2.5 and SIA components was comparatively significant. PM2.5 and SIA of BTH contributed by emissions from outside region was 23.4% and 45.5%, respectively. Local emissions contributed 51.2%~68.8% of the annual average PM2.5 and 36.7%~56.4% of the SIA in each province and city. Sources of the four severe pollution processes in January 2013 of Beijing were analyzed combining backward trajectory model; and it was found that the sources were quite different from each other, including long distance transportation from northwest direction, short distance transportation from the south and local air-mass transportation from southwest and southeast. Regional transportation was more obviously during the severe pollution processes, PM2.5 and SIA contributed by local emissions were only 35.1%~37.3% and 17.1%~28.4%, respectively. Among that, air-mass transported from southern part could lead to higher pollution level; and the contributions from emissions of BTH was remarkable, they reached 83.2% and 76.4% for PM2.5 and SIA, respectively.
王晓琦, 郎建垒, 程水源, 陈国磊, 刘晓宇. 京津冀及周边地区PM2.5传输规律研究[J]. 中国环境科学, 2016, 36(11): 3211-3217.
WANG Xiao-qi, LANG Jian-lei, CHENG Shui-yuan, CHEN Guo-lei, LIU Xiao-yu. Study on transportation of PM2.5 in Beijing-Tianjin-Hebei (BTH) and its surrounding area. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3211-3217.
Lang J L, Cheng S Y, Li J B, et al. A monitoring and modeling study to investigate regional transport and characteristics of PM2.5 pollution[J]. Aerosol and Air Quality Research, 2013,13(3):943-956.
Lin J, An J, Qu Y, et al. Local and distant source contributions to secondary organic aerosol in the Beijing urban area in summer[J]. Atmospheric Environment, 2016,124:176-185.
Zhou Y, Cheng S Y, Liu L, et al. A coupled MM5-CMAQ modeling system for assessing effects of restriction measures on PM10 pollution in Olympic City of Beijing, China[J]. Journal of Environmental Informatics, 2012,19(2):120-127.
[11]
Multi-resolution emission inventory for China[Z/OL]. URL:http://www.meicmodel.org/.
Chen T F, Chang K H, Tsai C Y. Modeling direct and indirect effect of long range transport on atmospheric PM2.5 levels[J]. Atmospheric Environment, 2014,89:1-9.
[15]
Li X, Wang L, Ji D, et al. Characterization of the size-segregated water-soluble inorganic ions in the Jing-Jin-Ji urban agglomeration:Spatial/temporal variability, size distribution and sources[J]. Atmospheric Environment, 2013,77:250-259.
Wagstrom K M, Pandis S N. Source-receptor relationships for fine particulate matter concentrations in the Eastern United States[J]. Atmospheric Environment, 2011,45(2):347-356.