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CCSM_BGC in CCSM3.1-carbon & no-warming A2 run

I would like to know which is the meaning of CCSM_BGC (and of its options) in
env_conf:
setenv CCSM_BGC CO2C # [none | CO2A | CO2B | CO2C | CO2_DMSA ]
I am trying to set up a no-warming A2 run and I do not know if I have to modify the CCSM_BGC value...
Thanks!
 
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