广州近郊秋季大气有机气溶胶来源及特征组分

廖芸仟; 余淼; 梁琳; 王小月; 尹健帆; 房泽; 常鸣; 袁斌; 邵敏; 黄山

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (1) : 53-65.

大气污染与控制

广州近郊秋季大气有机气溶胶来源及特征组分

廖芸仟, 余淼, 梁琳, 王小月, 尹健帆, 房泽, 常鸣, 袁斌, 邵敏, 黄山

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Sources and characteristic components of atmospheric organic aerosols in the autumn suburbs of Guangzhou

LIAO Yun-qian, YU Miao, LIANG Lin, WANG Xiao-yue, YIN Jian-fan, FANG Ze, CHANG Ming, YUAN Bin, SHAO Min, HUANG Shan

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摘要

于2022年秋季利用黑碳-气溶胶质谱仪(SP-AMS)对广州近郊大气PM₁进行了两个月观测.基于正交矩阵因子分析法(PMF)对有机气溶胶(OA)进行来源解析,并对其特征组分颗粒态有机硝酸酯(pON)进行量化讨论.观测期间PM₁[(15.90 ± 12.28)μg/m³]受有机物主导(57.8%),除硫酸盐外主要组分呈现夜高日低的特征.OA主要来源于本地二次生成(28.3%)和长距离传输(23.9%),及烹饪、机动车尾气、生物质燃烧等一次排放(47.8%).pON对OA贡献可达24.7%,且在总硝酸盐浓度低时占比显著升高.其夜间增加可促进次日大气氧化性升高.pON主要源于本地二次生成(51.5%)和机动车尾气(39.8%).高颗粒物浓度时段OA受本地二次生成和机动车排放主导;高臭氧浓度时段,有机物及硫酸盐出现明显中午峰(光化学氧化作用),二次OA贡献升至59.8%,pON也主要源于本地二次生成(60.8%).

Abstract

A two-month observation of atmospheric PM₁ in suburban Guangzhou in autumn 2022 was conducted using a Soot-Particle High Resolution Time-of-Flight Aerosol Mass Spectrometer (SP-AMS). Sources apportionment of organic aerosol (OA) was performed using Positive Matrix Factorization (PMF). OA’s characteristic component particulate organic nitrates (pON) were quantified and explored. During the observation period, PM[ (15.90 ± 12.28) μg/m³] was dominated by organics (57.8%), with major components (excluding sulfate) exhibiting higher nocturnal concentrations than diurnal concentrations. OA was mainly contributedby local secondary formation (28.3%), long-range transport (23.9%), and primary emissions such as cooking, vehicle exhaust, and biomass burning (collectively 47.8%). pON contributed significantly to OA (24.7%), increasing markedly under low total nitrate concentrations. Its nocturnal increase may enhance next-day atmospheric oxidation capacity. pON mainly derived from local secondary formation (51.5%) and vehicle exhaust (39.8%). During high PM events, OA was dominated by local secondary formation and vehicle emissions; during high ozone conditions, organics and sulfate showed pronounced midday peaks (photochemical oxidation), secondary OA contribution rose to 59.8%, and pON was primarily from local secondary formation (60.8%).

导出引用

廖芸仟, 余淼, 梁琳, 王小月, 尹健帆, 房泽, 常鸣, 袁斌, 邵敏, 黄山. 广州近郊秋季大气有机气溶胶来源及特征组分[J]. 中国环境科学. 2026, 46(1): 53-65

LIAO Yun-qian, YU Miao, LIANG Lin, WANG Xiao-yue, YIN Jian-fan, FANG Ze, CHANG Ming, YUAN Bin, SHAO Min, HUANG Shan. Sources and characteristic components of atmospheric organic aerosols in the autumn suburbs of Guangzhou[J]. China Environmental Science. 2026, 46(1): 53-65

中图分类号： X511

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