Preprints
https://doi.org/10.5194/acp-2021-83
https://doi.org/10.5194/acp-2021-83

  29 Mar 2021

29 Mar 2021

Review status: this preprint is currently under review for the journal ACP.

Saccharide composition in atmospheric fine particulate matter at the remote sites of Southwest China and estimates of source contributions

Zhenzhen Wang1, Di Wu1, Zhuoyu Li1, Xiaona Shang1, Qing Li1, Xiang Li1, Renjie Chen2, Haidong Kan2, Huiling Ouyang3, Xu Tang3, and Jianmin Chen1,3 Zhenzhen Wang et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Fudan Tyndall Centre, Fudan University, Shanghai 200438, China
  • 2School of Public Health, Key Lab of Public Health Safety of the Ministry of Education, NHC Key Laboratory of Health Technology Assessment, Fudan University, Shanghai 200032, China
  • 3IRDR International Center of Excellence on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health, Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China

Abstract. Based on source-specific saccharide tracers, the characteristic of biomass burning (BB) and biogenic emissions to saccharides was investigated in three rural sites at Lincang, where covered with 65 % of forest in the southwest border of China. The total saccharides accounted for 8.4 ± 2.7 % of OC, and 1.6 ± 0.6 % of PM2.5. The measured anhydrosugars accounted for 48.5 % of total saccharides, among which levoglucosan was the most dominant species. The high level of levoglucosan was both attributed to the local BB activities and biomass combustion smoke transported from the neighboring regions of Southeast Asia (Myanmar) and the northern Indian Peninsula. The measured mono (di) saccharides and sugar alcohols accounted for 24.9 ± 8.3 % and 26.6 ± 9.9 % of the total saccharides, respectively, were both proved to be mostly emitted by direct biogenic volatilization from plant materials/surface soils, rather than as byproducts of polysaccharides breakdown during BB processes. Five sources of saccharides were resolved by non-negative matrix factorization (NMF) analysis, including BB, soil microbiota, plant senescence, airborne pollen and plant detritus with the contribution of 34.0 %, 16.0 %, 21.0 %, 23.7 % and 5.3 %, respectively. The results provide the information on the magnitude of levoglucosan and contributions of BB, as well as the characteristic of biogenic saccharides, at the remote sites of Southwest China, which can be further applied to regional source apportionment models and global climate models.

Zhenzhen Wang et al.

Status: open (until 24 May 2021)

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  • CC1: 'Comment on acp-2021-83', Samuel Weber, 30 Mar 2021 reply

Zhenzhen Wang et al.

Zhenzhen Wang et al.

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Short summary
This study firstly investigates the composition of sugars in the fine fraction of aerosol over three sites in the southwest China. The result suggested no significant reduction in biomass burning emissions in Southwest Yunnan Province to some extent. The result shown shed a light on the contributions of biomass burning and the characteristic of biogenic saccharides in these regions, which can be further applied to regional source apportionment models and global climate models.
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