玉龙雪山PM<sub>2.5</sub>稳定碳同位素特征及来源分析

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Abstract In this study, PM_2.5 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 (δ¹³C_TC). 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 δ¹³C_TC 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 PM_2.5 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.

Key words： Yulong Snow Mountain TC WSOC stable carbon isotope source analysis

Received: 21 October 2021

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X513

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	XIAO Yang-ning
	XIAO Hong-wei
	CHEN Zhen-ping
	HUANG Li-lei
	MA Yan
	LI Zhi-tao
	LENG Quan
	JIN Xue-wu
	XIAO Hua-yun

Cite this article:

XIAO Yang-ning,XIAO Hong-wei,CHEN Zhen-ping等. Composition characteristics of chemical and stable carbon isotopes in PM_2.5 of Yulong Snow Mountain[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2034-2040.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2034

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