CO2 CMIP6 time series
I have introduced an option to let the CO2 mixing ratio change follow the CMIP6 time series for the historical period (until 2014). This is relevant for aqueous-phase chemistry, where the global annual mean CO2 mixing ratio is used to calculate the pH of the cloud droplets. Before a constant value for the year 2000 was used. The latter is still possible, but is no longer recommended.
The following flags were introduced in the rc-file:
input.conc.co2.cmip6 : T
input.conc.co2.cmip6.dir : <directory containing the files with CMIP6 global annual mean mixing ratios>
input.co2.fixyear : F
input.co2.year : <year>
When input.conc.co2.cmip6 is switched on, the CMIP6 time series is used.
The future scenarios need to be added, once they become available.
#3 Updated by Twan van Noije over 4 years ago
The file containing the historical global annual mean CO2 mixing ratios is called
and is available from