Composition characteristics of chemical and stable carbon isotopes in PM2.5 of Yulong Snow Mountain
XIAO Yang-ning1,2, XIAO Hong-wei1,2, CHEN Zhen-ping1,2, HUANG Li-lei1,2, MA Yan1,3, LI Zhi-tao1,2, LENG Quan4, JIN Xue-wu4, XIAO Hua-yun5
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. School of Geosciences, East China University of Technology, Nanchang 330013, China; 4. Yulong Snow Mountain Provincial Nature Reserve Management and Protection Bureau, Lijiang 674199, China; 5. School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China
Abstract：In this study, PM2.5 samples were collected in the Yulong Snow Mountain in the southeastern Qinghai-Tibet Plateau from April to August 2020. A total of 44 samples were taken to measure the composition of water-soluble ions, the concentration of water-soluble organic carbon (WSOC), the concentration of total carbon (TC), and alongside the composition of stable carbon isotope (δ13CTC). As measured, the TC concentrations of Yulong Snow Mountain in spring and summer were (7.1±3.8) μg/m3 and (2.9±0.7) μg/m3respectively, and the WSOC concentrations (3.3±2.1) μg/m3 and (1.5±0.4) μg/m3, showing a trend as high in spring and low in summer. The δ13CTC values in spring and summer were measured as (-24.7±1.0)‰ and (-26.0±0.6) ‰ respectively, which were more positive in spring than in summer, indicating that the value difference may be affected by different sources. As suggested by analysis of nss-K+correlation, FIRMS of NASA, and backward trajectory, biomass burning in Southeast Asia in spring may serve as the dominant contributor. Besides, the Bayesian model was also utilized to calculate the contribution of TC sources to PM2.5 in Yulong Snow Mountain. The results pointed that biomass burning and coal combustion accounted for the main sources in spring, with contribution rates of 60.6% and 23.5% respectively. Whereas in summer, TC mainly comes from biomass burning, plant evaporation, and vehicle emissions, together with the formation of secondary organic aerosol whose contribution cannot be ignored.
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