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In CRCM6-GEM5 one has the possibility of reading and using prescribed 2-D background AODs for all 5 types of aerosols, which will then get used by 'cccmarad2'. The fields can vary in time, but so far only 2-D fields can get used. read. As when using the default AOD, they will be distributed evenly (in term of meters) over all model levels of the planetary boundary layer.