[ACG40-P11] Plans for developing an Earth system model with CH4 dynamics
Keywords:Climate Change, Methane(CH4), Eearth System Model(ESM)
Methane (CH4) is one of the important GHGs for climate prediction due to its relatively high radiative forcing next to that of CO2, and now it is necessary to pay more attention to global CH4 dynamics after Paris agreement. Under the control of CO2 emission to keep a global temperature rise this century below 2 degrees Celsius above pre-industrial level, concentration of CH4 in the atmosphere will be more influential to climate change. Furthermore, the atmospheric life time of CH4 is around 9 years, it could be a good target for climate change mitigation. However, current Earth system models (ESMs) cannot project CH4 concentration with fully coupled manner: some models can predict atmospheric CH4 concentration but its predicted concentration is not based on the anthropogenic/natural CH4 emission under climate interactions. In order to make climate projection with fully coupled CH4 processes, we have started to couple CH4 dynamics into our ESM, by introducing atmospheric chemistry model and the terrestrial CH4 emission scheme into an ESM. In this presentation, brief introduction and the progress of our ESM development will be made, and plans for application of the ESM to CH4-related simulations will be shown.