Preprints
https://doi.org/10.5194/acp-2021-1049
https://doi.org/10.5194/acp-2021-1049
 
24 Jan 2022
24 Jan 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Distribution and stable carbon isotopic composition of dicarboxylic acids, ketocarboxylic acids and α-dicarbonyls in fresh and aged biomass burning aerosols

Minxia Shen1,2, Kin Fai Ho3,4, Wenting Dai1, Suixin Liu1, Ting Zhang1, Qiyuan Wang1, Jingjing Meng5, Judith C. Chow1,6, John G. Watson1,6, Junji Cao1, and Jianjun Li1,7 Minxia Shen et al.
  • 1State Key Laboratory of Loess and Quaternary Geology, Key Lab of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
  • 2University of Chinese Academy of Sciences, Beijing, China
  • 3The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
  • 4Shenzhen Municipal Key Laboratory for Health Risk Analysis, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China
  • 5School of Geography and the Environment, Liaocheng University, Liaocheng 252000, China
  • 6Division of Atmospheric Sciences, Desert of Research Institute, Reno, Nevada, USA
  • 7CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China

Abstract. Biomass burning (BB) is a significant source for dicarboxylic acids (diacids) and related compounds that play important roles in atmospheric chemistry and climate change. In this study, a combustion chamber and oxidation flow reactor were used to generate fresh and aged aerosols from burned rice, maize, and wheat straw to investigate atmospheric aging and the stable carbon isotopic (δ13C) composition of these emissions. Succinic acid (C4) was the most abundant species in fresh samples; while, oxalic acid (C2) became dominant after atmospheric aging. Of all diacids, C2 had the highest aged to fresh emission ratios of 50.8 to 64.5, suggesting that C2 is largely produced through secondary photochemical processes. Compared with fresh samples, the emission factors of ketocarboxylic acids and α-dicarbonyls increased after 2-day but decreased after 7-day aging, indicating short residence time and further atmospheric degradation from 2- to 7-days. The C2 δ13C values for aged biomass samples were higher than those of urban aerosols but lower than marine or mountain aerosols, and the C2 δ13C became isotopically heavier during aging. Relationships between the reduction in volatile organic compounds (VOCs), such as toluene, benzene, and isoprene, and increase in dicarboxylic acids after 2-day aging indicate that these volatile organic compounds led to the formation of dicarboxylic acids.

Minxia Shen et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1049', Anonymous Referee #1, 17 Feb 2022
  • RC2: 'Comment on acp-2021-1049', Anonymous Referee #2, 24 Apr 2022
  • AC1: 'Comment on acp-2021-1049', Jianjun Li, 12 May 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1049', Anonymous Referee #1, 17 Feb 2022
  • RC2: 'Comment on acp-2021-1049', Anonymous Referee #2, 24 Apr 2022
  • AC1: 'Comment on acp-2021-1049', Jianjun Li, 12 May 2022

Minxia Shen et al.

Minxia Shen et al.

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Short summary
Characteristics and δ13C compositions of dicarboxylic acids and related compounds in BB aerosols, we used a combined combustion and aging system to generate fresh and aged aerosols from burning straws. The results showed that the emission factors (EFaged) of total diacids of aging experiments were around an order of magnitude higher than EFfresh. This meant that dicarboxylic acids are largely involved with secondary photochemical processes in the atmosphere rather than primary emissions from BB.
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