06 Jun 2023
 | 06 Jun 2023

Evolution of Nucleophilic High-molecular-weight Organic Compounds in Ambient Aerosols

Chen He, Hanxiong Che, Zhier Bao, Yiliang Liu, Qing Li, Miao Hu, Jiawei Zhou, Shumin Zhang, Xiaojiang Yao, Quan Shi, Chunmao Chen, Yan Han, Lingshuo Meng, Xin Long, Fumo Yang, and Yang Chen

Abstract. Nucleophilic high-molecular-weight organic compounds (HMWOC) are sensitive to proton (H+) in FT-ICR MS analysis. A comprehensive evaluation of diurnal evolution of nucleophilic HMWOC was performed. HMWOCs aged significantly in daily cycles, accompanied by functionality shifts, particularly oxygenated and reduced nitrogen (CHON and CHN) and oxygenated organics. The intensities of HMW oxygenated compounds increased during daytime and nighttime. The daytime evolution produced more nitrogen-containing compounds with carboxylic groups (–COOH) homologs with molecular weights greater than 300, while the nighttime evolution produced mostly small CHON compounds (molecular weights <300). During evolution, nighttime CHON removals were also observed; meanwhile, carboxylation was also identified in CHON groups. The daytime evolution produced significantly more reduced nitrogen-containing compounds and a day- and nighttime increase in CHN compounds with five members was also observed. This study can provide insights into the aging of less polar organic aerosols.

Chen He et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-936', Anonymous Referee #1, 13 Jun 2023
    • AC1: 'Reply on RC1', Yang Chen, 22 Oct 2023
  • RC2: 'Comment on egusphere-2023-936', Anonymous Referee #2, 03 Jul 2023
    • AC2: 'Reply on RC2', Yang Chen, 22 Oct 2023

Chen He et al.


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Short summary
We examined the daily evolution of high molecular weight organic compounds with molecular weights up to 1000 Da in order to comprehend their behavior in the atmosphere under actual conditions. Those compounds were proven to undergo multi-generation oxidation, carboxylation, and nitrification via both day- and night-time chemistry.