西安城区大气CO_2浓度的变化特征及趋势研究

Study of Variation Characteristics and Trend of Atmospheric CO_2 Concentration

为了解西安市大气中CO2的特征,于东仪路烈士陵园对CO2进行了2011年~2013年的连续观测。结果表明,西安大气中CO2浓度的日变化大致呈现双峰趋势;同时,CO2浓度随季节变化明显,12月最高6~8月最低;2011~2013年间,CO2浓度和每年增幅均呈上升趋势。研究表明,西安大气中CO2主要来源于化石燃料燃烧等人为源,采暖季浓度明显高于非采暖季且日变化规律存在差异,机动车尾气的排放对CO2浓度每日的第二个峰值形成有重要影响。并采用SPSS软件对西安市2020年的CO2浓度做预测分析,其中私家车保有量和绿化面积对CO2浓度有直接影响。

In order to study the characteristics of atmospheric CO：, this study made continuous observation on atmospheric CO： at martyr＇s park of Xi＇an during 2011 to 2013. The results showed that the daily variation of CO： concentration had presented a double- peak pattern. Meanwhile, the atmospheric CO2 concentration had an obvious seasonal variation, and the highest value appeared in December and lowest from June to August; The overall CO2 concentration and annual increases was on the rise from 2011 to 2013. Studies indicated that the atmospheric CO2 of Xi＇an mainly resulted from anthropogenic source such as combustion of fossil fuel and other human sources ： Heating seasonal concentration was obviously higher than that in non - heating season and there were differences between daily variations. Motor vehicle exhaust emissions had a significant influence on daily second spiking of atmospheric CO： concentration. The predictive analysis was also made for the CO2 concentration of Xi＇an city in 2020 with SPSS software, and the private car inventory and the green area had a direct influence on the CO2 concentration.