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WRF-CHEM turn on/off aerosols indirect effect

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New member
I am fairly confused by turn on/off aerosols indirect effect in WRF-Chem model.
The cloud formation is dependent on the aerosols in the atmosphere, so the aerosol indirect effect always exists.
It is not reasonable if users turn off aerosol indirect effect.
Can you give me an explanation about the difference about turn on/off aerosol indirect effect.
Thanks. Look forward to your response.