Hi again Marcus! I was digging into the openifsr43r3v1 code, and there are numerous references to GHG tracers such as CO2, CH4 and N2O in the GFL routines, which were added initially for the GEMS project (as far as I can understand).
Also, the mass fixers discussed in Recommendations for mass fixers in OpenIFS? also support the GHG tracers .
So does this mean we could use the existing interface and setup openifs to use a small number of GHG tracers, and using the simple passive tracers you mention above?