Preprints
https://doi.org/10.5194/acp-2022-142
https://doi.org/10.5194/acp-2022-142
 
03 Mar 2022
03 Mar 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Measurement report: Large contribution of biomass burning and aqueous-phase processes to the wintertime secondary organic aerosol formation in Xi’an, Northwest China

Jing Duan1, Ru-Jin Huang1,2, Yifang Gu1,2, Chunshui Lin1, Haobin Zhong1,2, Wei Xu1, Quan Liu3, Yan You4, Jurgita Ovadnevaite5, Darius Ceburnis5, Thorsten Hoffmann6, and Colin O’Dowd5 Jing Duan et al.
  • 1State Key Laboratory of Loess and Quaternary Geology (SKLLQG), CAS Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3China State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 4National Observation and Research Station of Coastal Ecological Environments in Macao, Macao Environmental Research Institute, Macau University of Science and Technology, Macao SAR 999078, China
  • 5School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, H91CF50, Ireland
  • 6Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10−14, Mainz 55128, Germany

Abstract. Secondary organic aerosol (SOA) plays an important role in particulate air pollution, but its formation mechanism is still not fully understood. The chemical composition of non-refractory particulate matter with a diameter ≤ 2.5 µm (NR-PM2.5), OA sources, and SOA formation mechanisms were investigated in urban Xi’an during winter 2018. The fractional contribution of SOA to total OA mass (58 %) was larger than primary OA (POA, 42 %). A biomass burning-influenced oxygenated OA (OOA-BB) was resolved in urban Xi’an, which was formed from the photochemical oxidation and aging of biomass burning OA (BBOA). The formation of OOA-BB was more favorable in the days with larger OA fraction and higher BBOA concentration. In comparison, the aqueous-phase processed oxygenated OA (aq-OOA) was more dependent on secondary inorganic aerosol (SIA) content and aerosol liquid water content (ALWC), and increased largely to 50 % of OA during SIA-enhanced periods. Further Van Krevelen (VK) diagram analysis suggests the increased aq-OOA contributions during SIA-enhanced periods were likely from alcohol or peroxide addition in the OA aqueous-phase oxidation processes.

Jing Duan 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 acp-2022-142', Anonymous Referee #1, 10 Mar 2022
  • RC2: 'Comment on acp-2022-142', Anonymous Referee #2, 27 Mar 2022
  • AC1: 'Response to referee comments', Ru-Jin Huang, 26 May 2022

Jing Duan et al.

Data sets

The data set of NR-PM2.5 chemical composition and OA sources in winter Xi'an Jing Duan, Ru-Jin Huang, Yifang Gu, Chunshui Lin, Haobin Zhong http://paleodata.ieecas.cn/FrmDataInfo.aspx?id=841de3df-bac9-4827-ba77-a456e9e27f96

Jing Duan et al.

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Short summary
A biomass burning-influenced oxygenated OA (OOA-BB) was resolved in urban Xi’an, which was formed from the photochemical oxidation and aging of biomass burning OA (BBOA). An aqueous-phase processed oxygenated OA (aq-OOA) was more dependent on secondary inorganic aerosol (SIA) content and aerosol liquid water content (ALWC). The increased aq-OOA contributions during SIA-enhanced periods were likely from alcohol or peroxide addition in the OA aqueous-phase oxidation processes.
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