夏季干旱对大气污染物的影响与驱动因素

蒋锋; 吴波

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中国环境科学 ›› 2024, Vol. 44 ›› Issue (8) : 4260-4273.

大气污染与控制

夏季干旱对大气污染物的影响与驱动因素

蒋锋, 吴波

作者信息 +

Impact of summer drought on atmospheric pollutant concentrations and its driving factors

JIANG Feng, WU Bo

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文章历史 +

摘要

利用2022年1月~8月中国300个地级市大气污染物(PM_2.5, PM₁₀, NO₂和SO₂)小时浓度数据及同期气象数据,研究夏季干旱对大气污染物的影响及其驱动因素.研究结果显示:干旱期间和正常期间长株潭城市群PM_2.5, PM₁₀, NO₂和SO₂浓度累积分布存在显著差异,且3个城市间同类污染物浓度的累积分布模式具有明显一致性.夏季干旱事件对PM_2.5, PM₁₀, NO₂和SO₂污染具有一定的抑制作用,其NO₂分别累积降低45.27μg/m³(长沙), 48.53μg/m³(株洲)和13.40μg/m³(湘潭); PM₁₀累积降低了56.30μg/m³(长沙), 55.68μg/m³(株洲)和23.73μg/m³(湘潭); PM_2.5分别累积降低了36.54μg/m³(长沙),24.48μg/m³(株洲)和37.52μg/m³(湘潭); SO₂分别累积降低了2.19μg/m³(长沙),18.51μg/m³(株洲)和4.35μg/m³(湘潭).干旱通过气温,气压,风速和相对湿度4个驱动因素来降低PM_2.5, PM₁₀, NO₂和SO₂浓度.

Abstract

Based on the hourly concentrations of PM_2.5, PM₁₀, NO₂ and SO₂ (January to August, 2022) and the meteorological data in 300 prefecture-level cities in China, the influence of summer drought on air pollutants and the driving factors were studied. The findings revealed significant disparities in the cumulative distribution of PM_2.5, PM₁₀, NO₂, and SO₂ concentrations in the Changsha-Zhuzhou-Xiangtan urban agglomeration between drought and normal periods. The cumulative distribution patterns of pollutant concentrations in the cities within the urban agglomeration remained notably consistent. Summer drought was shown to suppress pollution levels of PM_2.5, PM₁₀, NO₂, and SO₂. Specifically, reductions in NO₂ concentrations were observed at 45.27μg/m³ (Changsha), 48.53μg/m³ (Zhuzhou), and 13.40μg/m³ (Xiangtan); PM₁₀ at 56.30μg/m³ (Changsha), 55.68μg/m³ (Zhuzhou), and 23.73μg/m³ (Xiangtan); PM_2.5 at 36.54μg/m³ (Changsha), 24.48μg/m³ (Zhuzhou), and 37.52μg/m³ (Xiangtan); and SO₂ at 2.19μg/m³ (Changsha), 18.51μg/m³ (Zhuzhou), and 4.35μg/m³ (Xiangtan). The study demonstrated that drought could lead to reduced concentrations of PM_2.5, PM₁₀, NO₂, and SO₂ through driving factors such as temperature, atmospheric pressure, wind speed and relative humidity. This research extended the understanding of the impact of drought on air pollution and provided new insights for advancing pollution prevention and control under conditions of extreme weather.

导出引用

蒋锋, 吴波. 夏季干旱对大气污染物的影响与驱动因素[J]. 中国环境科学. 2024, 44(8): 4260-4273

JIANG Feng, WU Bo. Impact of summer drought on atmospheric pollutant concentrations and its driving factors[J]. China Environmental Science. 2024, 44(8): 4260-4273

中图分类号： X513

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