Subjects: Geosciences >> Geography submitted time 2024-04-29 Cooperative journals: 《干旱区研究》
Abstract： Persistent cold air pools (PCAPs) in valley cities lead to the prolonged accumulation of air pollutants,thereby affecting the lives and health of residents. In this study, sounding data and daily air quality data from January 2013 to November 2023 were used to calculate and statistically analyze the characteristics of PCAPs occurrences in the Lanzhou Valley. In addition, the impact of PCAPs intensity on changes in pollutant concentrations was explored, and variations in pollutant concentrations during PCAPs were analyzed and compared with concurrent dust aerosol pollution. Results indicate that from 2013 to 2023, 59 PCAPs occurred, lasting cumulative 197days. During PCAPs, valley heat deficit and PM2.5 concentrations were 4.43 J·m−2 and 52.14 μg·m−3 higher, respectively, compared with non-PCAPs. The air quality index (AQI), SO2 concentration, NO2 concentration, CO concentration, and PM10 concentration increased by 70.37%, 144.3%, 84.3%, 156%, and 73.15%, respectively, whereas O3 concentration decreased by 60.89% during PCAPs. In PCAPs without dust aerosols, the average PM2.5:PM10 ratiowas 0.58, whereas in PCAPs with dust aerosols, the average ratio was 0.31. During PCAPs with concurrent dustaerosols, PM2.5 concentration, PM10 concentration, AQI, and O3 concentration increased by 18.33% , 133.03% ,84.44%, and 8.5%, respectively. However, SO2 and CO concentrations decreased by 17.54% and 17.88%, respectively. These findings can serve as a reference for atmospheric pollution prevention and management strategies in the Lanzhou region.
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