Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Journal of Advances in Modeling Earth Systems e2019MS001940 [22 ] 2020 fdi:010079381 ENG Journal of Advances in Modeling Earth Systems ISI:000538038300019 4 10.1029/2019ms001940 https://www.documentation.ird.fr/hor/fdi:010079381 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-08/010079381.pdf 12 Horizon (IRD) The implementation of boundary conditions is a key aspect of climate simulations. We describe here how the Climate Model Intercomparison Project Phase 6 (CMIP6) forcing data sets have been processed and implemented in Version 6 of the Institut Pierre-Simon Laplace (IPSL) climate model (IPSL-CM6A-LR) as used for CMIP6. Details peculiar to some of the Model Intercomparison Projects are also described. IPSL-CM6A-LR is run without interactive chemistry; thus, tropospheric and stratospheric aerosols as well as ozone have to be prescribed. We improved the aerosol interpolation procedure and highlight a new methodology to adjust the ozone vertical profile in a way that is consistent with the model dynamical state at the time step level. The corresponding instantaneous and effective radiative forcings have been estimated and are being presented where possible. 021 ; 020 UR182