Pollution Characteristics and Sources of Atmospheric Volatile Organic Compounds in Autumn and Winter in Yinchuan and Their Effects on Ozone Formation
Based on the online monitoring results of volatile organic compounds(VOCs)in autumn and winter of Yinchuan from October to December 2021 and 2022,the composition characteristics of VOCs in autumn and winter of Yinchuan were analyzed.The orthogonal matrix factor analysis(PMF)model and the coupled MCM mechanism photochemical reaction box model(PBM-MCM)were used to analyze the sources and ozone generation sensitivity of VOCs with increased ozone(O3)concentration in autumn and winter of Yinchuan.The results showed that the average concentration of total volatile organic compounds(TVOC)from October to December 2022 was 6.49 ppbv,higher than the same period in 2021,with an increase of 17.8％.The components of alkanes,alkynes,halogenated hydrocarbons,and oxy gen-containing volatile organic compounds(OVOCs)all increased year-on-year,among which alkynes show the largest growth and a year-on-year increase of 61.9％;and the sharing rate of each source in October December 2021 and 2022 was similar,with regional transmission industrial sources and combustion sources contributing more in 2021,accounting for 24.3％and 22.0％respectively.The proportion of solvent application sources included:1.solvent,2.oil and gas volatilization sources,and 3.motor vehicle exhaust,all of which were equivalent,ranging from 12.3％to 14.9％.In 2022,the contribution of combustion sources has risen to the top,accounting for 22.0％,followed by regional transmission sources and industrial sources,accounting for 18.4％.The solvent application source included:1.solvent,2.oil and gas volatilization sources,and 3.motor vehicle exhaust,all of which were equivalent,accounting for 13.2％-16.7％.The period from October to December 2021 and 2022 was basically located in the VOCs control zone.Among them,in December 2022,anthropogenic sources were most sensitive to ozone generation.If the goal of reducing ozone generation potential by 10％was achieved,VOCs and NOX would be reduced proportionally(3∶1),and the total emission reduction percentage would reach 27％.It can be seen that reducing VOCs was still an effective way for Yinchuan to reduce the potential for ozone generation at the current stage.
国家科技期刊平台
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