瓦里关大气二氧化碳和甲烷本底浓度变化特征

The Variation Characteristics of Background Concentration of Carbon Dioxide and Methane in Waliguan Atmosphere

利用1994年至2017年瓦里关全球大气本底站在线监测的CO2和CH4数据,分析其变化特征。结果表明:瓦里关地区大气CO2年平均体积浓度呈逐年增加的趋势,年平均浓度从1994年的358.99ppm增加到2017年的406.80ppm,期间CO2浓度共增加了47.81ppm,增幅为13.32%,年平均增长率为1.99ppm·a^-1。季节变化特征表现为冬春季偏高,夏秋季偏低。CH4年平均体积浓度从1994年的1804.7ppb增长至2017年的1905.7ppb,CH4浓度共增加了101ppb,增幅为5.6%,年平均增长率约为4.43ppb·a^-1。季节变化特征为冬春季偏低,夏秋季偏高。

According to the analysis of online monitoring data of CO2 and CH4 at the Waliguan Global Atmospheric Watch Station from 1994 to 2017,It is concluded that the average volume concentration of CO2 in Waliguan area is increasing gradually year by year.The annual average concentration of CO2 has increased from 358.99 ppm in 1994 to 406.80 ppm in 2017.During this period, the concentration of CO2 increased by 13.32% with an absolute value of 47.81ppm,and the average annual growth rate is 1.99ppm·a^-1.The seasonal variation characteristic of CO2 concentration is higher in winter and spring while lower in summer and autumn.Besides, the annual average concentration of CO2 has increased from 1804.7ppb in 1994 to 1905.7ppb in 2017.During this period, the concentration of CH4 increased by 5.6% with an absolute value of 101 ppb, and the average annual growth rate is 4.43ppb·a^-1.The seasonal variation characteristic of CH4 concentration is lower in winter and spring while higher in summer and autumn.