基于多级粒径段观测的大气二次有机气溶胶形成途径研究

唐梦雪; 黄晓锋; 何冬一; 冯凝; 何凌燕

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (2) : 612-617.

大气污染与控制

基于多级粒径段观测的大气二次有机气溶胶形成途径研究

唐梦雪, 黄晓锋, 何冬一, 冯凝, 何凌燕

作者信息 +

Research on the atmospheric secondary organic aerosol formation pathways based on multi-stage size-resolved observations

TANG Meng-xue, HUANG Xiao-feng, HE Dong-yi, FENG Ning, HE Ling-yan

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文章历史 +

摘要

为了探究大气二次有机气溶胶(SOA)的粒径分布及形成途径,在成都开展了大气分粒径颗粒物采样.结果发现,大气颗粒物粒径呈双峰分布,以细颗粒为主,峰值位于0.56~1.0μm和3.2~5.6μm.有机物在细模态和粗模态中均占比最高,SO₄^2-、NH₄⁺、K⁺等主要分布于细模态,NO₃^-、Ca²⁺和Mg²⁺则集中于粗模态,表明粗颗粒物受土壤尘影响显著.来源解析显示, SOA为总有机物的主要贡献组分(67%).相关性分析发现,细模态SOA与SO₄^2-、NH₄⁺显著相关,粗模态SOA则与Ca²⁺、Mg²⁺及水溶性Fe呈正相关,表明粗模态SOA的形成与包含了过渡金属元素铁的土壤尘的非均相反应有关.不同粒径中pH值、气溶胶含水量与SOA相关性表现出差异,反映出其在SOA形成中的复杂复合作用.

Abstract

To investigate the particle size distribution and formation pathways of atmospheric secondary organic aerosols (SOA), size-resolved aerosol sampling was conducted in Chengdu. The results revealed a bimodal distribution dominated by fine particles, with mass concentration peaks observed at 0.56~1.0μm and 3.2~5.6μm. Organic matter was the most abundant component in both fine and coarse modes. SO₄^2-, NH₄⁺, and K⁺ were mainly present in the fine mode, while NO₃^-, Ca²⁺, and Mg²⁺ were enriched in the coarse mode, indicating a strong influence of soil dust on coarse particles. Source apportionment showed that SOA accounted for 67% of the total organic matter. Correlation analysis revealed that fine-mode SOA was significantly associated with SO₄^2- and NH₄⁺, while coarse-mode SOA was positively correlated with Ca²⁺, Mg²⁺, and water-soluble Fe, suggesting that the formation of coarse mode SOA was related to the heterogeneous reaction of soil dust containing transition metal element Fe. The differing correlations of pH and aerosol liquid water content with SOA across particle sizes highlight their complex and combined roles in SOA formation.

导出引用

唐梦雪, 黄晓锋, 何冬一, 冯凝, 何凌燕. 基于多级粒径段观测的大气二次有机气溶胶形成途径研究[J]. 中国环境科学. 2026, 46(2): 612-617

TANG Meng-xue, HUANG Xiao-feng, HE Dong-yi, FENG Ning, HE Ling-yan. Research on the atmospheric secondary organic aerosol formation pathways based on multi-stage size-resolved observations[J]. China Environmental Science. 2026, 46(2): 612-617

中图分类号： X513

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