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https://doi.org/10.5194/egusphere-2025-1335
https://doi.org/10.5194/egusphere-2025-1335
08 May 2025
 | 08 May 2025

Chemical and stable carbon isotopic compositions of PM2.5 from two typical forests in China: Implication for sources

Mingyu Li, Zhanjie Xu, Zhichao Dong, Junjun Deng, Pingqing Fu, and Chandra Mouli Pavuluri

Abstract. To elucidate the origin and seasonality of atmospheric aerosols in forest areas, simultaneous PM2.5 collection was carried out in two typical forest sites: Changbai Mountain (CB, 42.40N, 128.11E), North China and Xishuangbanna (BN, 22.25N, 100.89E), South China, at day and night during the summer and winter periods of 2023–2024. Carbonaceous and nitrogenous components, water-soluble inorganic ions (WSIIs) and stable carbon isotopic composition of total carbon (δ13CTC) were measured in PM2.5. Generally, the contents of carbonaceous and nitrogenous components were higher in winter than summer, with secondary organic carbon (SOC) and water-soluble organic carbon (WSOC) higher in daytime than in nighttime at CB and BN. The average concentrations of WSIIs in total samples were 5.36 μg m-3 and 2.23 μg m-3 at CB and BN. SO42-, NO3- and NH4+ were dominant at CB, while SO42-, NH4+ and Na+ were dominant at BN, which accounted for 86 % and 89 % in BN to the total ions.δ13CTC ranged from −27.8 ‰ to −22.1 ‰ at CB, while −27.6 ‰ to −24.5 ‰ at BN. Based on the results obtained, we found that besides biogenic emissions, the emissions from biomass burning and terrestrial and/or marine organisms were major sources of aerosols at both sites. Further fossil fuel combustion contributed more significantly at CB than at BN. Thus, this study provides insight into the origins and aging processes of PM2.5 in forest areas in North and South China.

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Mingyu Li, Zhanjie Xu, Zhichao Dong, Junjun Deng, Pingqing Fu, and Chandra Mouli Pavuluri

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  • RC1: 'Comment on egusphere-2025-1335', Anonymous Referee #1, 26 May 2025
  • RC2: 'Comment on egusphere-2025-1335', Anonymous Referee #2, 18 Jun 2025

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1335', Anonymous Referee #1, 26 May 2025
  • RC2: 'Comment on egusphere-2025-1335', Anonymous Referee #2, 18 Jun 2025
Mingyu Li, Zhanjie Xu, Zhichao Dong, Junjun Deng, Pingqing Fu, and Chandra Mouli Pavuluri
Mingyu Li, Zhanjie Xu, Zhichao Dong, Junjun Deng, Pingqing Fu, and Chandra Mouli Pavuluri

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Short summary
This study investigated the seasonal and diurnal variability of fine aerosol composition in two forest ecosystems in North and South China. Carbonaceous/nitrogenous compound concentrations were higher in winter than summer at both sites. The forest fine aerosols in high latitude exhibited significantly greater influence from fossil fuel combustion compared to that in low latitude.
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