I am currently running WRF (v4.5.2) simulations using bias-corrected CMIP5 data for RCP 4.5, 6.0 and 8.5. For the LW and SW scheme, I'm using the RRTMG scheme. From the user guide for WRF v4.5 (Welcome to WRF User’s Guide! — WRF Users Guide documentation), it is described that the CO2 concentration (in ppm) for the RRTMG scheme is given by the equation 280 + 90*exp(0.02*(year - 2000). However, will it not be the same for all RCP scenarios?? Also, within the namelist variable, we also have the option to use CAMtr_volume_mixing_ratio files, by using ghg_input = 1, but it s written that "default is SSP 2 with RCP 4.5 -> SSP245". So, is it going to be the same for all RCPs, if this option is turned on??
I'm also attaching an image with the difference within the values of CAMtr_volume_mixing_ratio.SSP245 (CAM-SSP245) and CAMtr_volume_mixing_ratio.SSP585 (CAM-SSP585) with respect to default formula from RRTMG scheme for CO2 concentrations.
I'm also attaching an image with the difference within the values of CAMtr_volume_mixing_ratio.SSP245 (CAM-SSP245) and CAMtr_volume_mixing_ratio.SSP585 (CAM-SSP585) with respect to default formula from RRTMG scheme for CO2 concentrations.