ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 42 Issue 7 > 2016,42(7):827-837. DOI:10.7519/j.issn.1000-0526.2016.07.006 Prev Next
Simulation of a Heavy PM2.5 Pollutant Event over BeijingTianjinHebei Region in October 2014
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Abstract:
In recent years, the eastern part of China, especially the JingJinJi (shortly for BeijingTianjinHebei Region) has suffered increasingly severe pollution of PM2.5. A case of PM2.5 pollution over the JingJinJi Region during the autumn of 2014 is studied with WRFChem model in this paper. The results show that the pollution was caused by a stable weakhigh pressure system with the dominant southerly wind on the surface. The temperature inversion layer further suppressed the diffusion of pollutants in the vertical direction. High concentration of PM2.5 mainly spread in southern Beijing, Tianjin and northern Hebei Province, where the contribution of secondary PM2.5 was higher than that of primary PM2.5 to most of the pollution areas. Vertically, the secondary inorganic particles accumulated around Beijing, then became a high concentration region affixed to the ground surface. On the other hand, there was a zone of high pollutants over 1.2-1.6 km, and primary pollutants only had one high value area near the surface. The vertical distribution height of PM2.5 showed a similar trend with the boundary layer height.
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