Based on ERA-Interim reanalysis data, air pollution data and meteorological data, the T-mode principal component analysis (PCT) was used to classify the sea level pressure field and the 10m wind field in Chengdu into eight weather types. The air pollution status and the characteristics of pollution meteorological parameters under different weather types were analyzed, and the meteorological characteristics and potential pollution sources under heavy pollution weather types were described from the perspective of pollution meteorology. First, PM2.5 Pollution in Chengdu area would be aggravated and developed the polluted weather event when the weather type was in high-pressure rear part type, low-front high-back type, saddle-type field and northern high-pressure bottom type. The PM2.5 pollution was significantly weaker and belonged to the clean type under other four weather types:the west road cold-front front type, the high-pressure edge type, the northwest high pressure bottom type, and the east road cold-front front type. Second, the inversion layer in Chengdu area was stronger and the lower height of the mixed layer was not conducive to the diffusion dilution of PM2.5 under the polluted weather type. In addition, the southern wind component in the boundary layer was obviously increased, and the northeast wind was weakened. The amount of ventilation was small, thus the wind field had a weak ability to diffuse pollutants. Third, we studied the PM2.5 pollution transport and potential sources of Chengdu under the polluted weather type. We believed that the southern and southwestern regions of Chengdu had significant effects on the mass concentration of PM2.5 under various types of polluted weather, and under the saddle weather type, the eastern and northeastern parts of Chengdu were contributing to Chengdu PM2.5 pollution. Under the northern high-pressure bottom type, the PM2.5 in the Chengdu area was mainly affected by pollutants in the surrounding areas, and the pollutants imported from other areas were relatively small.
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LI Pei-rong, XIAO Tian-gui. The diffusion and transport of PM2.5 under the polluted weather conditions during autumn and winter seasons in Chengdu. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 63-75.
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