Temporal changes of CO2 concentrations for IPCC experiments

Concentration of CO2 is increased with 1 %/year (compound) rate for e1%to2xf and e1%to4xf, started from 348 ppmv which is used as constant value in the present-day control simulation ePDcntrlf. The concentration reaches doubled (696 ppmv) at 70th year and quadrupled (1392 ppmv) at 140th year, then is fixed after that at respective levels for e1%to2xf and e1%to4xf.