化石燃料结构变化对大气中δ^(13)CO_2的影响

Effects of fossil fuel structure change on the atmospheric δ^(13)CO_2

根据煤炭、石油和天然气等化石燃料的CO2排放量及其碳稳定同位素组成,用按比例叠加的方法逐年计算1860~1996年CO2化石燃料源的d13CO2(PDB),用简单全球碳循环模式研究该变化对大气d13CO2的影响,并将计算结果与CMDL近10年的监测数据进行对比.结果表明,化石燃料源的d13CO2在140年内下降了4.5,在碳循环模式中考虑这种动态变化之后,大气d13CO2的模拟结果与同期实测值的相关程度有较大提高.

Based on the CO2 emission amount and the stable carbon isotope composition of coal, petroleum, and natural gas, we calculated the d13CO2(PDB) of the fossil fuels from 1860 to 1996; then investigated the effects of the fossil fuel structure change on the atmospheric d13CO2 with a simple global carbon cycle model, and compared the calculated results with the monitored data by CMDL since 1989. Results show that d13CO2 of the fossil fuel decreased 4.5 during the last 140 years; after considering this dynamic change in the carbon cycle model, the correlativity between the calculated results and the simultaneous monitored values of atmospheric d13CO2 has been enhanced considerably.