摘要
城市是温室气体的排放热点。基于3台便携式CO_(2)/CH_(4)/H_(2)O分析仪于2022年夏季观测无锡市近地面大气CO_(2)和CH_(4)浓度。结果表明:(1)近地面大气CO_(2)和CH_(4)浓度高于背景站的,且不同功能区CO_(2)和CH_(4)浓度存在差异。近地面大气CO_(2)浓度与城市背景站差值(ΔCO_(2))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CH_(4)浓度的差值(ΔCH_(4))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CO_(2)和CH_(4)排放源,污水处理厂是主要的CH_(4)排放源,排放热点附近大气CO_(2)和CH_(4)浓度较周围高约30%及以上。(3)隧道内CH_(4)∶CO_(2)值为0.0014±0.00001,表明无锡市车辆以CO_(2)排放为主。
Cities are the concentrated spots of greenhouse gas emissions.In this study,we used three Portable CO_(2)/CH_(4)/H_(2)O analyzers to observe the near-surface atmospheric CO_(2) and CH_(4) concentrations in Wuxi City during the summer of 2022.The results indicate that:(1)The CO_(2) and CH_(4) 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(ΔCO_(2))between the near-surface atmospheric CO_(2) concentration and the CO_(2) concentration at the urban background station is as follows:the CO_(2) concentration of the mixed commercial and residential area is higher than that of the residential area,followed by the CO_(2) concentration in the industrial area,the forest area and the Lake Taihu scenic spot from high to low.The CH_(4) difference(ΔCH_(4))is distributed in the following pattern:the CH_(4) concentration of the mixed commercial and residential zone>CH_(4) concentration of the forest zone>CH_(4) concentration of the residential zone>CH_(4) concentration of the industrial zone>CH_(4) concentration of the Lake Taihu scenic spot.(2)Vehicle emissions are the main sources of CO_(2) and CH_(4) emissions in Wuxi,and sewage treatment plants are the main source of CH_(4) emission.The atmospheric CO_(2) and CH_(4) concentrations near the emission-concentrated spots are about 30%higher than those in the surrounding areas.(3)The ratio of CH_(4) to CO_(2) in the tunnel is 0.0014±0.00001,which indicates that the emission of vehicles is dominated by the CO_(2) emission in the urban area of Wuxi.
作者
孙其然
李若男
胡凝
郑有飞
乔峥
张依婷
姬崇桂
刘佳颖
肖薇
Sun Qiran;Li Ruonan;Hu Ning;Zheng Youfei;Qiao Zheng;Zhang Yiting;Ji Chonggui;Liu Jiaying;Xiao Wei(Scotland Academy of Wuxi Taihu University,Wuxi 214063,China;Atmospheric Environment Center of Nanjing University of Information Science and Technology,Nanjing 210044,China;Key Laboratory of Ecosystem Carbon Source and Sink,China Meteorological Administration,Nanjing 210044,China)
出处
《气象与环境科学》
2024年第4期98-104,共7页
Meteorological and Environmental Sciences
基金
国家重点研发计划项目(2019YFA0607202、2020YFA0607501)
江苏省杰出青年基金项目(BK20220055)
江苏省碳达峰碳中和科技创新专项资金(前沿基础)项目(BK20220020)。
