摘要
A global two-dimensional chemistry model is developed to study long-term trends of CH_4 since industrial revolution.The sources of CH_4,CO and NO_x are parameterized as functions of latitude and time. With two long-term emission scenarios,long-term trends of CH_4 are simulated.The results have a good agreement with observation from ice cores.The modeled CH_4 increased from 760 ppbv in 1840 to 1611.9 ppbv in 1991, while the modeled number concentration of tropospheric OH decreased from 7.17×10~5 cm~(-3)in 1840 to 5.79×10~5 cm~(-3) in 1991.The increase of atmospheric CH_4 can be explained by the increase of emission of CH_4 and build-up because of decrease of OH radicals that remove CH_4 from the atmosphere. The model is also used to simulate the distribution of CH_4.Comparisons between the model results and observations show that the model can simulate both latitudinal distribution and seasonal variation of CH_4 well.
A global two-dimensional chemistry model is developed to study long-term trends of CH_4 since industrial revolution.The sources of CH_4,CO and NO_x are parameterized as functions of latitude and time. With two long-term emission scenarios,long-term trends of CH_4 are simulated.The results have a good agreement with observation from ice cores.The modeled CH_4 increased from 760 ppbv in 1840 to 1611.9 ppbv in 1991, while the modeled number concentration of tropospheric OH decreased from 7.17×10~5 cm~(-3)in 1840 to 5.79×10~5 cm~(-3) in 1991.The increase of atmospheric CH_4 can be explained by the increase of emission of CH_4 and build-up because of decrease of OH radicals that remove CH_4 from the atmosphere. The model is also used to simulate the distribution of CH_4.Comparisons between the model results and observations show that the model can simulate both latitudinal distribution and seasonal variation of CH_4 well.
基金
国家重点基础研究发展计划(973计划)
