【摘要】 城市是温室气体的排放热点。基于3台便携式CO₂/CH₄/H₂O分析仪于2022年夏季观测无锡市近地面大气CO₂和CH₄浓度。结果表明：（1）近地面大气CO₂和CH₄浓度高于背景站的，且不同功能区CO₂和CH₄浓度存在差异。近地面大气CO₂浓度与城市背景站差值（ΔCO₂）空间分布呈现为商业居民混合区的>住宅区的>工业区的>林区的>太湖景区的；而CH₄浓度的差值（ΔCH₄）空间分布呈现为商业居民混合区的>林区的>住宅区的>工业区的>太湖景区的。（2）车辆排放是无锡市主要的CO₂和CH₄排放源，污水处理厂是主要的CH₄排放源，排放热点附近大气CO₂和CH₄浓度较周围高约30%及以上。（3）隧道内CH₄∶CO₂值为0.0014±0.00001,表明无锡市车辆以CO₂排放为主。更多还原

【Abstract】 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 functional 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 concentration 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 residential 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 emission-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.更多还原