Analysis of Present Day and Future OH and Methane Lifetime in the ACCMIP Simulations

Results from simulations performed for the At- mospheric Chemistry and Climate Modeling Intercompari- son Project (ACCMIP) are analysed to examine how OH and methane lifetime may change from present day to the future, under different climate and emissions scenarios. Present day (2000) mean tropospheric chemical lifetime derived from the ACCMIP multi-model mean is 9.8± 1.6 yr (9.3± 0.9 yr when only including selected models), lower than a recent

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