Preprints
https://doi.org/10.5194/acp-2022-801
https://doi.org/10.5194/acp-2022-801
20 Dec 2022
 | 20 Dec 2022
Status: this preprint was under review for the journal ACP but the revision was not accepted.

Enhanced behaviors of optical properties and the radiative effects of molecular-specific brown carbon from dung combustion in the Tibetan Plateau

Qian Zhang, Yujie Zhang, Zhichun Wu, Bin Zhang, Yaling Zeng, Jian Sun, Hongmei Xu, Qiyuan Wang, Zhihua Li, Junji Cao, and Zhenxing Shen

Abstract. Traditional animal dung fuel use is a prominent source of brown carbon (BrC) in the Tibetan Plateau (TPL) region. Changes in burning conditions, fuel types, and uses of dung fuels in Plateau areas can lead to considerable uncertainties about molecular absorption properties and their radiative forcing influence on BrC. Here, the constituents of BrC’s chromophoric molecules emitted from residential heating and cooking scenarios using dung fuels were proposed using ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry in the TPL region, China. Our results show that dung fuels in this study can release abundant BrC emissions with substantial high BrC absorption when compared with those observed in bitumite. Particularly, the linkage between BrC molecules and their absorption properties was quantified by partial least squares regression. Among detected BrC’s molecular groups, above 70 % of N-containing compounds (CHON and CHONS) with low-oxygen-containing and unsaturated aromatic bonds and 20.9–27.5 % of CHO compounds measured from the dung combustion samples were lies in the potential BrC chromophores regions. Further, a significantly enhanced contribution of molecular absorption coefficient (Mbabs) to total Mbabs (up to 99.7 %) was observed in the presence of both CHO and CHON (N2+N4) with distinctive characteristics of long carbon chains and high levels of unsaturation. Interestingly, the identified CHONS markers were highly oxygenated with abundant unsaturated double-bonds and high Mbabs, but were rarely produced under insufficient oxygen conditions at the high-altitude plateau. Meanwhile, the incomplete combustion of dung produced high values of integrated simple forcing efficiency and thus destroyed the radiation balance over the TPL region.

Qian Zhang et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-801', Anonymous Referee #1, 12 Jan 2023
    • AC1: 'Reply on RC1', Zhenxing Shen, 26 Apr 2023
  • RC2: 'Comment on acp-2022-801', Anonymous Referee #2, 15 Feb 2023
    • AC2: 'Reply on RC2', Zhenxing Shen, 26 Apr 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-801', Anonymous Referee #1, 12 Jan 2023
    • AC1: 'Reply on RC1', Zhenxing Shen, 26 Apr 2023
  • RC2: 'Comment on acp-2022-801', Anonymous Referee #2, 15 Feb 2023
    • AC2: 'Reply on RC2', Zhenxing Shen, 26 Apr 2023

Qian Zhang et al.

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Latest update: 20 Aug 2023
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Short summary
We identified the brown carbon (BrC) molecules and their absorbing abilities on a molecular level from animal dung fuel combustion over the Tibetan Plateau region in China. The ultra-high performance liquid chromatography quadrupole time-of-flight mass spectrometer coupled with the partial least squares regression were precisely applied to characterize the molecular absorptions, key molecular markers, and radiative effects of BrC from household combustion scenarios at the high-altitude area.
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