File naming convention: 
prefix_BC_fp_YYYYMMDD.png

prefix - nowet - PES values calculated without wet scanvenging. 
         nowet_west - Same as nowet but map projection shifted westward. 
         nowet_east - Same as nowet but map projection shifted eastward. 
         wet - PES values with wet scavenging enabled in the model. 

BC - run for black carbon
fp - PES values of bottom layer of model output (0 - 100 meter). 
YYYY- year
MM - month
DD - day
