南京信息工程大学王俊锋团队研究了长江三角洲特大城市亚微米气溶胶特征：成分、来源和光吸收。2025年4月14日，《大气科学进展》杂志发表了这一成果。

2022年初，研究组在中国南京开展了一项实地活动，调查了亚微米气溶胶（PM1）的化学成分、来源和光吸收。PM1的平均浓度为31µg m-³，有机物（33%）占最大比例，其次是硝酸盐（30%）、硫酸盐（18%）、铵（15%）、氯化物（3%）和rBC（2%）。确定了四种有机气溶胶（OA）亚组分，包括两种主要OA（POA）和两种次要OA（SOA）。氧化程度较低的SOA（LO-OOA）占OA总质量的59%。LO-OOA与左葡聚糖的示踪离子C₂H₄O₂⁺和另一种来自老化生物质燃烧的物种K₃SO₄⁺密切相关，表明它可能受到老化生物质燃烧OA的影响。、

该研究还表明，春节期间的烟花爆竹对空气质量有不利影响，在静态的冬季气象条件下导致二次形成和积累，延长了污染持续时间。此外，发现LO-OOA具有最强的光吸收能力。研究结果强调，LO-OOA的光吸收主要归因于C_xH_yN⁺家族，随着双键当量（DBE）值的增加而增加。氧化程度较高的SOA（MO-OOA）表现出可忽略的光吸收，与白天的光化学过程密切相关，这意味着存在光漂白效应。这项研究加深了研究组对冬季长三角典型特大城市南京生物质燃烧和烟花爆竹对PM1污染的区域贡献的理解，有助于制定该地区长期空气质量改善的战略。

附：英文原文

Title: Characteristics of submicron aerosols (PM1) in a Yangtze River Delta megacity: Composition, sources, and light absorption

Author: Shiyue Yang, Haifeng Meng, Ning Zhang, Shijie Cui, Yuanjie Shan, Yu Huang, Yunlong Xu, Chongchong Zhang, Xinlei Ge, Mindong Chen, Junfeng WANG

Issue&Volume: 2025-04-14

Abstract: We conducted a field campaign to investigate the chemical composition, sources, and light absorption of submicron aerosols (PM1) from in early 2022 in Nanjing, China. The average concentration of PM1 was 31 μg m-3, organics (33%) constituted the largest fraction, followed by nitrate (30%), sulfate (18%), ammonium (15%), chloride (3%), and rBC (2%). Four organic aerosol (OA) subcomponents were identified, including two primary OA (POA) and two secondary OA (SOA). The less-oxidized SOA (LO-OOA) contributes the most to the total OA mass (59%). LO-OOA is tightly correlated with the tracer ion C2H4O2+ from levoglucosan, and another aged biomass-burning derived species, K3SO4+, suggesting it was likely influenced by aged biomass-burning OA. Our study also revealed that fireworks during the Spring Festival have a detrimental impact on air quality, contributing to secondary formation and accumulation under static winter meteorological conditions, prolonging the pollution duration. Also, LO-OOA was found to have the strongest light-absorbing ability. Our results highlighted that the light absorption of LO-OOA was mainly attributed to the CxHyN+ family, increased with the double bond equivalent (DBE) value. The more-oxidized SOA (MO-OOA) exhibited a negligible light absorption and was strongly correlated with daytime photochemical processes, implying a light-bleaching effect. This study enhances our understanding of the regional contribution of biomass combustion and fireworks to PM1 pollution in Nanjing, a typical megacity in the YRD during winter, aiding in the development of strategies for long-term air quality improvement in the region.

DOI: 10.1007/s00376-025-5003-7

Source: http://www.iapjournals.ac.cn/aas/en/article/doi/10.1007/s00376-025-5003-7viewType=HTML