There are two ways, a quick and a flexible one. For both first determine the equivalent CO2 concentration in ppm and convert it into mixing ratio by dividing by 658157.16

*
The quick one:
*

In src_radiation.f90 after the ico2_rad select case assign your mixing ratio to the variable zqco2

CASE (10) ! RCP85 scenario (for 1950 <= zyear <= 2150) ! eff. CO2 (all GreeHouseGases (GHG) considered) zqco2 = ( – 4.0501145412E+07_ireals & + 7.9386473439E+04_ireals * zyear & – 5.8292720579E+01_ireals * zyear*zyear & + 1.9002921793E-02_ireals * zyear**3 & – 2.3202412328E-06_ireals * zyear**4) * 1.519E-06_irealsEND SELECT zqco2 = …. ! insert your mixing ratio here

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The flexible one:
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in organize_physics.f90 change

IF (ico2_rad.GT.10 ) ico2_rad = ico2_rad_dto

IF (ico2_rad.GT.11 ) ico2_rad = ico2_rad_d

in src_radiation change

zyearmin = 1950to

IF (ico2_rad < 11) THEN zyearmin = 1950 ELSE zyearmin = ! .... put a year lower than the start year of your simulation period hereand change

CASE (10) ! RCP85 scenario (for 1950 <= zyear <= 2150) ! eff. CO2 (all GreeHouseGases (GHG) considered) zqco2 = ( – 4.0501145412E+07_ireals & + 7.9386473439E+04_ireals * zyear & – 5.8292720579E+01_ireals * zyear*zyear & + 1.9002921793E-02_ireals * zyear**3 & – 2.3202412328E-06_ireals * zyear**4) * 1.519E-06_irealsEND SELECT to

CASE (10) ! RCP85 scenario (for 1950 <= zyear <= 2150) ! eff. CO2 (all GreeHouseGases (GHG) considered) zqco2 = ( – 4.0501145412E+07_ireals & + 7.9386473439E+04_ireals * zyear & – 5.8292720579E+01_ireals * zyear*zyear & + 1.9002921793E-02_ireals * zyear**3 & – 2.3202412328E-06_ireals * zyear**4) * 1.519E-06_ireals CASE (11) !… last millenium zqco2 = !… insert your mixing ratio here ENDSELECTIn the CCLM namelist PHYCTL set

ico2_rad=11In the same way you can define several different mixing ratios with additional numbers 12, 13, 14 etc.

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There are two ways, a quick and a flexible one. For both first determine the equivalent CO2 concentration in ppm and convert it into mixing ratio by dividing by 658157.16

END SELECT zqco2 = …. ! insert your mixing ratio hereThe quick one:In src_radiation.f90 after the ico2_rad select case assign your mixing ratio to the variable zqco2

toThe flexible one:in organize_physics.f90 change

in src_radiation change

to

and change

END SELECT to In the CCLM namelist PHYCTL set In the same way you can define several different mixing ratios with additional numbers 12, 13, 14 etc.