In the call to fair_scm the following pre-industrial background concentrations of GHGs are used:
CO2: 278ppm
CH4: 722ppb
N2O: 273ppb
CF4: 34.497ppt
CH3Br: 13.0975ppt
CH3Cl: 547.996ppt
The latter three values were chosen in order to provide a pre-industrial steady state with the natural emissions of these compounds (given in the RCPs) and lifetimes (given in AR5).
However in the module constants.preindconc the following pre-industrial concentrations are given:
CO2: 278.05158ppm
CH4: 721.89411ppb
N2O: 272.95961ppb
CF4: 35ppt
CH3Br: 5.8ppt
CH3Cl: 480ppt
These values correspond to 1765 concentrations in the RCP datasets and are only used by the tools.steady module. However, only one set of pre-industrial concentrations should be used in FaIR, and this should come from the CMIP6 database (at http://climatecollege.unimelb.edu.au/cmip6). This is targeted to be implemented at v2.0.
In the call to
fair_scmthe following pre-industrial background concentrations of GHGs are used: CO2: 278ppm CH4: 722ppb N2O: 273ppb CF4: 34.497ppt CH3Br: 13.0975ppt CH3Cl: 547.996pptThe latter three values were chosen in order to provide a pre-industrial steady state with the natural emissions of these compounds (given in the RCPs) and lifetimes (given in AR5).
However in the module
constants.preindconcthe following pre-industrial concentrations are given: CO2: 278.05158ppm CH4: 721.89411ppb N2O: 272.95961ppb CF4: 35ppt CH3Br: 5.8ppt CH3Cl: 480pptThese values correspond to 1765 concentrations in the RCP datasets and are only used by the
tools.steadymodule. However, only one set of pre-industrial concentrations should be used in FaIR, and this should come from the CMIP6 database (at http://climatecollege.unimelb.edu.au/cmip6). This is targeted to be implemented at v2.0.