Chemical and stable carbon isotopic compositions of PM 2.5 from two typical forests in China: implication for sources
Year: 2025
Type: article
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.
Source: Biogeosciences
Institution: Tianjin University
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDGs: Climate action, Life on land
Open Access status: gold
Estimated APC paid: $1,628
Awards: G2306193605, G4199101813
OpenAlex ID: W4414913885