大气CO2 浓度的变化主要受源汇和大气传输过程影响，因此城市地区的浓度观测包含区域人为源排放的重要信息。随着杭州城市化进程不断加快，交通运输能耗快速增长，城市交通碳排放已成为城市碳排放的重要组成部分。针对杭州市城区高架路段的 CO2 浓度，在 2023 年 12 月开展车载移动观测实验，分析了城区高架路段CO2 浓度的时空分布特征，探索其影响因子。结果表明:杭州市城区高架路段CO2 浓度日变化呈单峰型特征，峰值出现在 17:30 晚高峰时段，低值出现在 11:30 时段;工作日和休息日的CO2 浓度差异明显，休息日晚高峰时段和中午时段 CO2 浓度高于工作日;不同高架路段的CO2 浓度也存在差异。城区交通繁忙程度，对道路大气CO2 浓度排放量影响明显。
Characterization of Spatial and Temporal Distribution of CO2 Concentration on Elevated Road Sections in the Urban Area of Hangzhou in Winter
Changes in atmospheric CO2 concentrations are mainly influenced by source-sink and atmospheric transport processes,so concentration observations in urban areas contain important information on regional an-thropogenic emissions by sources.With the accelerating urbanization of Hangzhou,the energy consumption of transportation is growing rapidly,and carbon emissions from urban transportation have become an important part of urban carbon emissions.In this study,a vehicle-mounted mobile observation experiment was conducted in De-cember 2023 to analyze the spatial and temporal distribution characteristics of elevated CO2 concentrations in Hangzhou urban areas and explore the influencing factors of CO2 concentrations on elevated urban areas in Hang-zhou.The results showed that the diurnal variation of elevated CO2 concentration in Hangzhou city was unimodal,with the peak value occurring at 17:30 and the low value at 11:30.The results of this study show that the daily changes of elevated CO2 concentration in Hangzhou is characterized by a single-peak type with the peak value oc-curring at 17:30 and the low value at 11:30.The CO2 concentration in the evening peak hours and noon hours on rest days was higher than that on working days.There are also differences in CO2 concentration among different elevated structures.The busyness of traffic in the urban areas has an obvious impact on the atmospheric CO2 con-centration of the road emission.
urban transportationcarbon dioxide concentrationspatial and temporal distribution characteristics
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