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Present day run with both PD and Pre-industrial input

Hi, I was wondering how to perform a PD run but with both PD input and PI input? For example, I am looking at the impacts of aerosols on clouds/climate. The impacts of aerosols are classified into 3 categories : 1) direct effect; 2)first indirect effect and 3) second indirect effect. I plan to run a Present day run with PD input for all 3 processes.That means a compset of F_2000_CAM5_PM configured with -chem none and by default set up prescribed MAM (mam3_1.9x2.5_L30_2000clim_c130319.nc in this case). Another run is Present day run for 1)direct effect and 2)first indirect effect while PI input for calculating 3)second indirect effect.I am lost at how the PI input (mam3_1.9x2.5_L30_1850clim_c130319.nc) can be read in at the same time for calculating one microphysical process while keeping the remaining model calculations using PD input (mam3_1.9x2.5_L30_2000clim_c130319.nc in this case). Thanks in advance! Lin Lingraduate studentUniversity of Wyoming
 
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