Formation mechanism of secondary organic aerosol in aerosol liquid water: A review

Explosive Secondary Aerosol Formation during Severe Haze in the North China Plain

“…1,5,6,8,9,15,16 Several previous reviews have provided a detailed account of the different aspects of air pollution in China. 17−21 The earlier papers focused on the general pollution features 19,22,23 or chemical characterization or sources of PM 18,20,24 or specialized in specific areas such as aerosol and PBL interactions, 17 SOA formation, 25 or aerosol pollution cycles. The colors represent the air mass originating from the south (black), northwest (blue and red), and northeast (yellow) (adopted from Guo et al 5 ).…”

“…On the other hand, severe haze formation has provided an exceptional scientific platform to obtain insights into the different chemical/physical aspects of the PM processes. Over the past decade, considerable scientific advances have been acquired in understanding the processes regulating haze formation, particularly in terms of the progress to elucidate the explosive secondary aerosol formation. ,,,,,, Several previous reviews have provided a detailed account of the different aspects of air pollution in China. − The earlier papers focused on the general pollution features ,, or chemical characterization or sources of PM ,, or specialized in specific areas such as aerosol and PBL interactions, SOA formation, or aerosol nucleation . However, few studies have presented a comprehensive overview on haze formation from the perspective of fundamental aerosol chemistry. ,− …”

Measurement report: Effects of anthropogenic emissions and environmental factors on the formation of biogenic secondary organic aerosol (BSOA) in a coastal city of southeastern China

“…Secondary organic aerosol (SOA) has attracted widespread scientific research concerns due to its potential impacts on climate change, human health and air quality (Shrivastava et al, 2017;Reid et al, 2018;Zhu et al, 2019;Wang et al, 2021b). Understanding the formation of SOA and assessing its relevance for environmental effects become an integral part of aerosol chemistry (Charan et al, 2019;Xiao et al, 2020;Palmer et al, 2022). However, due to its complex precursors and atmospheric physical or chemical processes, SOA prediction by air quality models remains highly uncertain (McFiggans et al, 2019).…”

“…SOA is produced by the conversion of biogenic and anthropogenic volatile organic compounds (BVOCs and AV-OCs) through complex homogeneous and heterogeneous reactions (Charan et al, 2019;Xiao et al, 2020;Mahilang et al, 2021). BVOCs are the main precursors of SOA on a global scale, while AVOCs are the predominant contributors to SOA in urban areas (Hallquist et al, 2009;Wang et al, 2021a).…”

Effects of nighttime heterogeneous reactions on the formation of secondary aerosols and ozone in the Pearl River Delta

“…无机硝酸盐作为颗粒物的主要成分，是大气中 NO x 重要的汇 [11] 。环境大气颗粒物中的液态水为痕量气 体的非均相反应提供了重要的场所 [12] 。N 2 O 5 的非均相水解对理解夜间自由基化学至关重要，并在一定程度 上主导了气溶胶硝酸盐的生成 [13] 。早期，Riemer 等人(2003)使用 γ (0.02)代入综合模拟系统 KAMM/DRAIS 和 EURAD/MADE 中发现，N 2 O 5 的非均相水解反应在欧洲高 NO x 区域使得硝酸盐生成得到显著增加 [14] 。 Lowe 等人(2015)和 Archer-Nicholls 等人(2014)将 N 2 O 5 的非均相化学机理纳入 WRF-Chem 后表明，N 2 O 5 的非均相反应使欧洲西北部地区 OH 和 NO 3 自由基对 VOC 的氧化效率降低了 1.5 倍，并使得夜间硝酸盐的 生成增加了 30 % [15,16] 。近年来，我国对 N 2 O 5 实际观测结果表明，夜间通过 N 2 O 5 非均相反应形成硝酸盐的 潜力在华北高海拔山区 [17] 和城市点位 [18] [19,20] 作为夜间非均相反应的重要产物，ClNO 2 不但可以作为指示性物种来反映非均相反应的效率，还对清晨 大气氧化性有重要影响 [21] 存在并积累，在清晨日出时通过光解反应生成活性氯自由基(Cl)和 NO 2 。Cl 自由基同 OH 自由基一样可以 氧化大气中的 VOCs，从而促进 RO 2 、HO x 和 O 3 的产生。ClNO 2 作为全球重要的 Cl 自由基来源，每年通过 光解产生约 8~22 Tg 氯自由基 [22] 。在中国华北农村地区 [23] ，ClNO 2 在污染日贡献了约 10 %~30 %的 RO x 和 13 %的 O 3 。在中国香港大帽山观测到的 ClNO 2 使得日间 O 3 产量增加了 11~41 % [24] [26] ，该仪器检测限为 2 pptv，时间分辨率为 1 min。…”