东海大气中C<sub>2</sub>~C<sub>8</sub>非甲烷烃的来源与环境效应

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Abstract The concentrations of 16 kinds of C₂~C₈ non-methane hydrocarbons (NMHCs) such as alkanes, alkenes and aromatic hydrocarbons in the atmosphere over the East China Sea during October 2021 were determined with the three-step low-temperature preconcentration system coupled with a gas chromatography-mass detector, which were used to explore their spatial distribution characteristics and sources and further evaluate their environmental effects. The atmospheric mixing ratios of the total NMHCs ranged from 1.15×10^-9 to 18.05×10^-9 with an average of (4.98±4.91)×10^-9, and the average values of alkanes, alkenes and aromatic hydrocarbons were (2.11±2.02)×10^-9, (1.18±1.04)×10^-9 and (1.69±2.51)×10^-9, respectively. The concentrations and spatial distributions of different NMHCs components were quite different. The concentrations of alkanes and aromatic hydrocarbons were higher near the shore and lower away from the shore, but the concentration differences between different stations of alkanes were smaller, while the alkenes showed relatively uniform distribution characteristics, though they were strongly affected by human activities. Source apportionments by positive matrix factorization (PMF) model showed that the ship emissions were the highest contributor for atmospheric NMHCs, which accounted for (32±30)%, and the contribution of marine emission sources was (28±23)%. Aromatic hydrocarbons were the key active components of the atmospheric NMHCs over the East China Sea, and their contributions to the generation of ozone (O₃) and secondary organic aerosol (SOA) were significantly greater than those of alkanes and alkenes.

Key words： non-methane hydrocarbon spatial distribution source environmental effect East China Sea

Received: 18 November 2022

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	LIU Zhen-fei
	WU Ying-cui
	QIAO Hao
	ZHOU Li-min
	ZHANG Hong-hai

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LIU Zhen-fei,WU Ying-cui,QIAO Hao等. Sources and environmental effects of C₂~C₈ non-methane hydrocarbons in the atmosphere over the East China Sea[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3281-3289.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3281

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