2013—2023年兰州山谷持续性冷池空气污染特征

doi:10.13866/j.azr.2024.03.03

Abstract

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 197 days. During PCAPs, valley heat deficit and PM_2.5 concentrations were 4.4 J·m^-2 and 52.59 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 PM_2.5:PM₁₀ ratio was 0.58, whereas in PCAPs with dust aerosols, the average ratio was 0.31. During PCAPs with concurrent dust aerosols, PM_2.5 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.

Key words: persistent cold air pools, dust aerosol, valley cities, valley heat deficit, air pollution

KANG Guoqiang, MA Minjin, CAO Yidan, CHEN Ran. Characteristics and pollutant concentrations of persistent cold air pools in Lanzhou from 2013 to 2023[J].Arid Zone Research, 2024, 41(3): 375-386.

Figures/Tables 9

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	SO₂/（μg·m^-3）	NO₂/（μg·m^-3）	CO/（mg·m^-3）	O₃/（μg·m^-3）	PM_2.5/（μg·m^-3）	PM₁₀/（μg·m^-3）
秋季	42.38	89.89	2.41	23.17	129.19	291.15
冬季	49.64	83.92	2.75	22.37	102.6	178.43

Characteristics and pollutant concentrations of persistent cold air pools in Lanzhou from 2013 to 2023

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