重庆市城区大气中CO_2和CH_4的浓度特征分析  

On Concentration Feature Analysis of CO_2 and CH_4 in City of Chongqing

作　　者：刘萍[1,2] 余家燕[1,2] 鲍雷[1,2] 刘敏[1,2] 

机构地区：[1]城市大气环境综合观测与污染防控重庆市重点实验室,重庆401147 [2]重庆市环境监测中心,重庆401147

出　　处：《西南师范大学学报（自然科学版）》2016年第5期146-150,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：环保公益性行业科研基金项目(200909010;201009001)

摘　　要：对重庆地区CH_4和CO_2浓度开展连续3年的监测和数据分析,发现其日变化和季节日变化均具有较强的规律性,其中日变化具有明显的一峰一谷的现象.从季节变化来看,CO_2和CH_4季节浓度变化规律均表现为冬季浓度最大,夏秋季浓度较小且振幅较大的特点,春、夏、秋和冬4个季节的CO_2多年日变化平均振幅分别为13.54×10^(-6)(体积分数,下同),18.38×10^(-6),13.72×10^(-6)和9.75×10^(-6),其主要是受到与OH自由基的光化学作用的影响;而CH_4的4个季节的平均振幅分别为0.32×10^(-6),0.26×10^(-6),0.37×10^(-6),0.21×10^(-6).本文还简单分析了CO_2和CH_4的日变化的相关性,相关系数为0.953 4,两者具有一定的同源性.另外从3年的监测数据来看,重庆城区两种主要温室气体的变化较为稳定,变化幅度较小,振幅仅为0.83×10^(-6).In past three years,it was continuoued measurements on methane and carbon dioxide in Chongqing.Their diurnal and seasonal variation were studied in detail.Analyzing results indicated that diurnal variation of two greenhouse gases had a pattern with one peak and one valley.The seasonal variation of the CO2 and CH4 showed the largest concentration of winter,the smaller of the concentration,and larger amplitude characteristics in summer and autumn,The average amplitude of diurnal variation of the CO2 was respectively 13.54×10^-6（volume fraction,the same below）、18.38×10^-6、13.72×10^-6、9.75×10^-6 in the spring／summer／autumn／winter.which was mainly due to the OH photochemical effects.And the CH4 was respectively 0.32×10^-6、0.26×10^-6、0.37×10^-6、0.21×10^-6.The article also briefly analyzed the diurnal variation of CO2 and CH4 correlation,The correlation coefficient was 0.953 4,which shows that they had the any same sources.In addition,the data were stable and smaller changes in the past three years,the amplitude only was 0.83×10^-6.

关 键 词：重庆 温室气体 浓度 分析 

分 类 号：X511[环境科学与工程—环境工程]