典型城市光化学污染在不同气象条件聚类下的特征与机制

刘莹莹; 陈赛赛; 栾和润; 林洲月; 尼霞次仁; 袁跃甫; 魏巍

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2413-2422.

臭氧污染与控制

典型城市光化学污染在不同气象条件聚类下的特征与机制

刘莹莹^1,2, 陈赛赛^1,2, 栾和润³, 林洲月^1,2, 尼霞次仁⁴, 袁跃甫⁴, 魏巍^1,2

作者信息 +

Characteristics and mechanisms of photochemical pollution in typical urban areas under different meteorological clusters

LIU Ying-ying^1,2, CHEN Sai-sai^1,2, LUAN He-run³, LIN Zhou-yue^1,2, NYIXIA Tsring⁴, YUAN Yue-fu⁴, WEI Wei^1,2

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摘要

围绕北京市夏季局地光化学污染特征与机制开展研究.首先,基于该市历年夏季气象观测数据,利用K-means方法得到了典型的气象聚类M1~M4,发现其对光化学污染形成影响的重要差异.在该市2021年排放条件下,利用箱式反应模型,开展了各气象聚类的局地光化学污染过程模拟.模拟显示:各气象聚类下O₃产率昼间均值为7.91×10^-9(M1),7.58×10^-9(M2),7.18×10^-9(M3),3.55×10^-9(M4)·h^-1,O₃生消途径十分相似,均处于VOCs敏感区,但对VOCs的敏感度呈递减趋势.而HCHO与CH3CHO的模拟浓度、产率、生消途径、及对VOCs线性响应均未呈现显著的气象聚类差异,显示了很好的VOCs示踪性.最后,计算了各聚类下65个VOCs组分的O₃增量反应IR,发现低活性组分与高活性组分的IR差异在M1条件显著变小,暗示了O₃污染日加强低活性组分控制对O₃浓度改善的重要性.

Abstract

This paper studied the characteristics and formation mechanisms of local photochemical pollution in Beijing during summer. Firstly, based on the meteorological observations, we obtained four typical meteorological clusters (M1~M4) based on the meteorological observations by using the K-means clustering algorithm and found the significant O₃ pollution difference among M1~M4. Then, under 2021 emissions of this city, we further simulated the local photochemical evolution of Beijing urban plumes respectively for four meteorological clusters, via a 0-D box model with the MCM (v3.3.1). The simulation results showed the daytime-averaged net O₃ production rate was 7.91×10^-9(M1), 7.58×10^-9(M2), 7.18×10^-9(M3), 3.55×10^-9(M4)·h^-1, but O₃ formation & loss pathways were very similar. O₃ formation was in the VOCs-limited regime, but its sensitivity to VOCs apparently decreased from M1 to M4. However, the simulated HCHO and CH₃ CHO had a little differences between various meteorological conditions, as well as their production rates and formation & loss pathways. The linear response of HCHO to VOCs indicated it could be as the good tracer for VOCs level. Finally, we calculated the O₃ increment reactivity (IR) of 65 VOCs species for each meteorological cluster, and found the differences in IR between low-reactivity and high-reactivity VOCs became significantly smaller under the M1 compared to M4, implying the importance of strengthening the control of low-reactivity components VOCs in on O₃ pollution days.

导出引用

刘莹莹, 陈赛赛, 栾和润, 林洲月, 尼霞次仁, 袁跃甫, 魏巍. 典型城市光化学污染在不同气象条件聚类下的特征与机制[J]. 中国环境科学. 2025, 45(5): 2413-2422

LIU Ying-ying, CHEN Sai-sai, LUAN He-run, LIN Zhou-yue, NYIXIA Tsring, YUAN Yue-fu, WEI Wei. Characteristics and mechanisms of photochemical pollution in typical urban areas under different meteorological clusters[J]. China Environmental Science. 2025, 45(5): 2413-2422

中图分类号： X511

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