Vehicle-carried Observation and Hotspot Identification of the Near-Surface Atmospheric CO2 and CH4 Concentration in Wuxi
Cities are the concentrated spots of greenhouse gas emissions.In this study,we used three Portable CO2/CH4/H2O analyzers to observe the near-surface atmospheric CO2 and CH4 concentrations in Wuxi City during the summer of 2022.The results indicate that:(1)The CO2 and CH4 concentrations of near-surface atmosphere are higher than those at the background station,and they vary in different func-tional zones.The spatial distribution of the difference(ΔCO2)between the near-surface atmospheric CO2 concentration and the CO2 concentration at the urban background station is as follows:the CO2 concentra-tion of the mixed commercial and residential area is higher than that of the residential area,followed by the CO2 concentration in the industrial area,the forest area and the Lake Taihu scenic spot from high to low.The CH4 difference(ΔCH4)is distributed in the following pattern:the CH4 concentration of the mixed commercial and residential zone＞CH4 concentration of the forest zone＞CH4 concentration of the res-idential zone＞CH4 concentration of the industrial zone＞CH4 concentration of the Lake Taihu scenic spot.(2)Vehicle emissions are the main sources of CO2 and CH4 emissions in Wuxi,and sewage treatment plants are the main source of CH4 emission.The atmospheric CO2 and CH4 concentrations near the emis-sion-concentrated spots are about 30％higher than those in the surrounding areas.(3)The ratio of CH4 to CO2 in the tunnel is 0.0014±0.00001,which indicates that the emission of vehicles is dominated by the CO2 emission in the urban area of Wuxi.
CO2 and CH4vehicle-mounted mobile observationhotspot identificationurban func-tional zone
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