Implementation of the CMIP6 Forcing Data in the IPSL‐CM6A‐LR Model
Thibaut Lurton, Yves Balkanski, Vladislav Bastrikov, Slimane Bekki, Laurent Bopp, Pascale Braconnot, Patrick Brockmann, Patricia Cadule, Camille Contoux, Anne Cozic, David Cugnet, Jean‐Louis Dufresne, Christian Éthé, Marie‐Alice Foujols, Joséfine Ghattas, Didier Hauglustaine, Rong‐Ming Hu, Masa Kageyama, Myriam Khodri, Nicolas Lebas, Guillaume Levavasseur, Marion Marchand, Catherine Ottlé, Philippe Peylin, Adriana Sima, Sophie Szopa, Rémi Thiéblemont, Nicolas Vuichard, Oliviér Boucher
Abstract
Abstract 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.