深圳市道路交通源温室气体排放特征分析

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Abstract In this study, three greenhouse gases (CO₂, CH₄, and N₂O) and one conventional gas (CO) were observed at a roadside station in Shenzhen from September, 2019 to July, 2020. The average concentration of CO₂, CH₄, N₂O, and CO was (430.8±6.1)x10^-6, (2318.5±137.9)x10^-9, (332.6±1.6)x10^-9, and (333.4±121.2)x10^-9, respectively. Seasonal variation of CO₂ and CO were high in winter and low in summer, Seasonal variation of CH₄ and N₂O were high in autumn and low in summer. The high concentration in autumn and winter is due to the long-distance transmission of fossil fuel emissions during the heating period, and the low concentration in summer is mainly due to the reduction of long-distance transmission sources and the enhancement of sinks such as plant photosynthesis and photochemical reactions. The diurnal variation of CO₂ concentration showed a two-peak and one-valley pattern, which was mainly affected by plant photosynthesis and morning and evening traffic peak; The diurnal variation of CO concentration showed a two-peak pattern, which was mainly affected by the morning and evening traffic peaks. The diurnal variation of CH₄ andN₂O concentration was high at night and low at day, which was mainly affected by daytime photochemical reaction. Among them, the concentration of CO₂ and CO is more sensitive to the emission of traffic sources. In addition, this study compared the COVID-19 lockdown period in 2020 with the same period in 2021, and the results showed that the concentration of CO₂, CH₄, N₂O, and CO decreased by 3.1%, 10.6%, 0.5% and 13.9%, respectively, indicating that traffic control can play an important role in reducing urban greenhouse gas emissions.

Key words： green house gases seasonal variation diurnal variation urban traffic emission

Received: 06 September 2021

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X511

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	ZHANG Ming-di
	HE Dong-yi
	GU Tian-fa
	SUN Tian-le
	LIN Xiao-yu
	HUANG Xiao-feng
	HE Ling-yan

Cite this article:

ZHANG Ming-di,HE Dong-yi,GU Tian-fa等. The characterization of greenhouse gas emission from road traffic sources in Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1518-1525.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1518

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