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Volume 40 Issue 9
Nov.  2022
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ZHAO Hui-jie, MA Yun-feng, WANG Shuai, LIU Qi-yao, WEI Xiang-nan. CAUSE ANALYSIS OF A HEAVY PM2.5 POLLUTION PROCESS OCCURED IN SHENYANG[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 33-43. doi: 10.13205/j.hjgc.202209005
Citation: ZHAO Hui-jie, MA Yun-feng, WANG Shuai, LIU Qi-yao, WEI Xiang-nan. CAUSE ANALYSIS OF A HEAVY PM2.5 POLLUTION PROCESS OCCURED IN SHENYANG[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 33-43. doi: 10.13205/j.hjgc.202209005

CAUSE ANALYSIS OF A HEAVY PM2.5 POLLUTION PROCESS OCCURED IN SHENYANG

doi: 10.13205/j.hjgc.202209005
  • Received Date: 2021-12-07
    Available Online: 2022-11-09
  • Using meteorological and environmental monitoring data, the pollution events, concentration variation characteristics and pollutant correlation of PM2.5 in Shenyang from 2015 to 2018 were analyzed. Using WRF-Chem and HYSPLIT model, a pollution process in Shenyang in 2018 was analyzed from the aspects of meteorological elements, high-altitude circulation situation and pollution transmission characteristics. The results indicated that the monthly concentration showed the characteristics of V-shaped, with a sequence of winter>spring>autumn>summer, and the daily concentration showed the characteristics of double peak. Correlation analysis showed that temperature(-0.3666) and relative humidity(-0.1158) were the main meteorological factors affecting PM2.5 concentration, while PM10(0.9964) and NO2(0.7242) were the main pollutants. From January 26th to 28th in 2018, a heavy pollution process occurred in Shenyang. At the beginning of the pollution, the high-altitude circulation was flat, the warm advection in front of the shallow trough was dominant, the ground was controlled by a weak high-pressure pressure equalizing field, the ground wind speed was dominated by the static and light wind, and the wind field convergence was conducive to the accumulation of pollutants. In the development process of pollution, the increase of ground relative humidity was conducive to the growth of particle moisture absorption; the thickness of ground and high-altitude inversion layer were large, and then the pollution was intensified. In the weakening process of pollution, the inversion layer disappeared, the stratification was stable, and the vertical diffusion conditions turned better. The accumulation of local pollutants and external transmission under static and stable meteorological conditions were the main reason of the heavy pollution.
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