1. Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, Nanchang 330013, China; 2. School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China; 3. Rosenstiel School of Marine and Atmospheric Science, University of Miami, FL, 33149, USA; 4. School of Geosciences, East China University of Technology, Nanchang 330013, China
Abstract:In this study, PM2.5 samples were collected in winter (January) and summer (July) 2018 at a remote site over the southern China. Black carbon (BC) concentrations of PM2.5 and their stable carbon isotope (δ13CBC) values, as well as water-soluble ion concentrations were analyzed. The results showed that the average concentrations of BC were (1.3±0.8) μg/m3and (0.8±0.3) μg/m3, while the average values of δ13CBC were (-25.8±1.6)‰ and (-26.3±0.7)‰ in winter and summer respectively. Both BC concentrations and δ13CBC showed high in winter and low in summer, suggesting that BC may be affected by different sources in different season. The results of Bayesian model showed that the fractional contributions of BC were 44.3% (28.8%) from biomass combustion, 29.3% (58.5%) from motor vehicle exhaust and 26.4% (12.7%) from coal combustion in winter(summer). The backward trajectories indicated that the BC in the background area of southern China may be affected by the long-distance transport from urban polluted areas.
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