Radical Formation by Fine Particulate Matter Associated with Highly Oxygenated Molecules

• DOI: 10.1021/acs.est.9b05149
• Publication Date: 2019-09-19T21:27:56Z
• Authors: Haijie Tong; Yun Zhang; Alexander Filippi; Ting Wang; Chenpei Li; Fobang Liu; Denis Leppla; Ivan Kourtchev; Kai Wang; Helmi-Marja Keskinen; Janne T. Levula; Andrea M. Arangio; Fangxia Shen; Florian Ditas; Scot T. Martin; Paulo Artaxo; Ricardo H. M. Godoi; Carlos I. Yamamoto; Rodrigo A. F. de ...; Ru-Jin Huang; Thomas Berkemeier; Yueshe Wang; Hang Su; Yafang Cheng; Francis D. Pope; Pingqing Fu; Maosheng Yao; Christopher Pöhlker; Tuukka Petäjä; Markku Kulmala; Meinrat O. Andreae; Manabu Shiraiwa; Ulrich Pöschl; Thorsten Hoffmann; Markus Kalberer
• Keywords: Aerosols; mechanisms; Air Pollutants; China; hydroxyl radicals; oxidation; volatility; 01 natural sciences; 7. Clean energy; 13. Climate action; Beijing; upper troposphere; 11. Sustainability; oxidized molecules; mass; Particulate Matter; chemical-composition; multiphase chemistry; secondary organic aerosol; Finland; 0105 earth and related environmental sciences

Highly oxygenated molecules (HOMs) play an important role in the formation and evolution of secondary organic aerosols (SOA). However, abundance HOMs different environments their relation to oxidative potential fine particulate matter (PM) are largely unknown. Here, we investigated relative HOM radical yield laboratory-generated SOA PM ambient air ranging from remote forest areas highly polluted megacities. By electron paramagnetic resonance mass spectrometric investigations, found that HOMs, especially dimeric low-volatility types, was positively correlated with radicals aqueous extracts. photooxidation isoprene, ozonolysis α- β-pinene, tropical (central Amazon) boreal (Hyytiälä, Finland) forests exhibited a higher than naphthalene urban sites (Beijing, Guangzhou, Mainz, Shanghai, Xi'an), confirming constituents biogenic generate radicals. Our study provides new insights into chemical relationship abundance, composition, sources by laboratory aerosols, enabling better quantification component-specific contribution source- or site-specific its climate health effects.