城市排放与输送对北京上甸子站温室气体本底观测的影响分析

Study on Impact of City Emission and Transportation on Greenhouse Gases Background Observation at Shangdianzi Regional Station, Beijing

以北京上甸子区域大气本底站二氧化碳(CO2)和几种典型卤代温室气体(HFC-134a、PFC-218和HCFC-22)浓度在线观测为例,统计分析并匹配计算了各风向浓度距平与浓度载荷,探讨了各季节城市排放和输送对上甸子站温室气体本底观测的影响。研究期间,CO2本底数据比例约21.2%,受局地和城市排放与输送影响,非本底浓度比本底浓度偏高(3.7±1.3)×10^(-6);HFC-134a和PFC-218浓度距平和浓度载荷的特征反映了两个物种源区特征的差别;HCFC-22浓度特征与空调制冷剂夏高冬低的季节排放规律相一致。

In this study in-situ measurement of carbon dioxide （CO2） and several halogenated greenhouse gases （HFC-134a, PFC-218 and HCFC-22） were chosen for the case study. We did statistical analysis and calculated concentration anomalies and loadings of each wind direction and discussed impact of city emission and transportation on greenhouse gases background observation at Shangdianzi Regional Station in different seasons. In the study period, the ratio of background concentration of CO2 was about 21.2%. The difference of non-background concentration and background concentration was （3.7＆#177;1.3）＆#215;10-6 by local and city emission and transportation. Anomalies and loadings of HFC-134a and PFC-218 relfected the difference of source characteristics of these two compounds. The seasonal trends of HCFC-22 were consistent with the emission pattern of refrigerant.