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| Influence of Baikal high-pressure split process on heavy pollution in Suihua City |
| LI Juan1,2, CHU Yang-xi1, DU Jin-hong1, JIN Wen-jing1, HU Rong-ming2, WEI Peng1 |
1. Atmospheric Environment Institute, Chinese Research Academy of Environmental Sciences, Beijing 100021, China;
2. College of Geomatics, Xi'an University of Science and Technology, Shanxi Xi'an 710054, China |
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Abstract To explore the impact of the Baikal high-pressure splitting process on the continuous heavy pollution incident in Suihua City during January 2020, based on the analysis of the mesoscale WRF weather forecast data and the meteorological observation data, the Weather situation and changes in meteorological elements were analyzed from January 9 to 21, 2020. Combining the pollutant concentration observation data and the PM2.5 component observation data, the pollutant concentration changes, and chemical composition characteristics in the process were analyzed. The pollution process was caused by continuous and stable weather caused by the splitting high pressure of Lake Baikal. During the 11~20 days, the AQI ranged from 182 to 329, of which 9days were severely polluted or above. During the period of heavy pollution, the relative humidity is about 94%, the wind speed on the ground drops to about 0.5m/s, the visibility dropped to about 1m/s, and there was an inversion layer, and the atmospheric diffusion conditions were poor. The continuous static and stable weather had led to the enhancement of atmospheric oxidation. The oxidant concentration (ρ(NO2) + ρ(O3)) was about 94~118μg/m3, and the maximum daily increase of sulfate and ammonium salt were 28.59 and 11.32mol/m3, and the growth rate increased by 1264% and 1270% respectively compared to the 14th. The low temperature, high humidity and high oxidizing atmosphere promoted the formation of secondary inorganic salts. Studies had shown that the continuous and stable weather caused by the high-pressure splitting process of Lake Baikal had increased atmospheric oxidation, coupled with unfavorable meteorological conditions and local accumulation and emission of pollutants, resulting in continuous heavy pollution weather in Suihua City.
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Received: 04 November 2020
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