利用离轴积分腔光谱仪对合肥市典型温室气体源的移动观测研究

doi:10.3964/j.issn.1000-0593(2023)10-3293-09

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Abstract CO₂ and CH₄ are the main greenhouse gases emitted by cities. Mobile observation methods with high precision and high spatio-temporal resolution are beneficial to understand the details of their distribution in cities, and the dynamic changes of sources. This work analyzes the existing mobile monitoring methods for atmospheric greenhouse gases. On this basis, a mobile observation system is built based on self-developed equipment off-axis integrated cavity spectrometer, a three-dimensional anemometer and vehicle differential GPS, and a matching greenhouse gas monitoring system is developed. The aerial observation data analysis software system has observed the CO₂ and CH₄ of typical roads in Hefei City, analyzed the hot spots of typical CH₄ concentration, and observed CH₄ in the landfills. The results show that the distribution of CO₂ concentration in the first ring road of Hefei has a good correlation with the impact of urban non-point source emissions, while the distribution of CH₄ has a poor correlation with it, and it is greatly affected by point sources. CO₂ and CH₄ concentration distribution in the second ring road is closely related to the distribution of surrounding forests, water sources and business circles. Generally, the average (median) concentrations (median) of CO₂ and CH₄ in the first and second rings in the morning and evening peak periods are higher than those in the idle time, and the concentrations in the first ring are higher than those in the second ring. Three-dimensional ultrasonic anemometers and GPS are used to calculate real-time natural wind speed and wind direction. The result showsthat the hot spots of CH₄ concentration on the road is mainly from natural gas filling stations, biochemical pools, natural gas vehicles, etc. Among them, the correlation coefficient between CH₄ and CO₂ emitted by natural gas vehicles is about 70%. The emissions are large during idling, starting and slow driving. The high CH₄ concentration captured in Feidong and Feixi, domestic waste landfills, is related to the incomplete sealing layer of the landfill and the unorganized release of the surrounding waste incineration power plant workshop. The Gaussian diffusion model estimated that the CH₄ emission rate when the workshop door of the Feixi landfill was opened was an order of magnitude higher than when it closed. The fugitive emission of CH₄ from Beicheng and Lujiang landfills was smaller than the first two. This study proves that the urban mobile observation system can provide a reference for establishing a comprehensive urban carbon emission monitoring system on the one hand and provide basic data for the study of urban greenhouse gas concentration characteristics on the other hand.

Key words：Mobile observation; CH₄; CO₂; Road observation; Point source; Landfill

Received: 2022-06-01 Accepted: 2023-02-15

ZTFLH:

X513

Corresponding Authors: SUN Wan-qi E-mail: sunwanqi2008@126.com

Cite this article:

WANG Yu,ZHANG Xian-ke,TAN Tu, et al. Research on Moving Observation of Typical Greenhouse Gas Sources in Hefei by Using Off-Axis Integrated Cavity[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(10): 3293-3301.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)10-3293-09 OR https://www.gpxygpfx.com/EN/Y2023/V43/I10/3293

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