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Implementation of the CMIP6 Forcing Data in the IPSL-CM6A-LR Model

Thibaut Lurton 1 Yves Balkanski 2 Vladislav Bastrikov 3 Slimane Bekki 4 Laurent Bopp 5 Pascale Braconnot 2 Patrick Brockmann 6 Patricia Cadule 1 Camille Contoux 3 Anne Cozic 6 David Cugnet 5 Jean-Louis Dufresne 5 Christian Éthé 1 Marie-Alice Foujols 1 Josefine Ghattas 1 Didier Hauglustaine 3 Rong-Ming Hu 4 Masa Kageyama 7 Myriam Khodri 8 Nicolas Lebas 8 Guillaume Levavasseur 1 Marion Marchand 4 Catherine Ottle 9 Philippe Peylin 9 Adriana Sima 5 Sophie Szopa 7 Rémi Thiéblemont 4 Nicolas Vuichard 9 Olivier Boucher 1
2 MERMAID - Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
4 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
6 CALCULS - Calcul Scientifique
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
7 CLIM - Modélisation du climat
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
8 VARCLIM - Océan et variabilité du climat
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
9 MOSAIC - Modélisation des Surfaces et Interfaces Continentales
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
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. Plain Language Summary Climate Model Intercomparison Project Phase 6 is an international project to compare the results from climate model simulations performed according to a common protocol. Such simulations require boundary conditions (called "climate forcings"), which are fed to the models in order to represent, for example, long-lived greenhouse gases, ozone, atmospheric aerosols, or land surface properties. The same forcing data sets are used by the different modeling groups who carry out the Climate Model Intercomparison Project Phase 6 simulations; however, their implementation may differ as it depends on the model structure. This article gives details of how these forcing data were implemented in the IPSL-CM6A-LR model. Some of the forcing data are common to all types all simulations, whereas others depend on the runs considered. Radiative forcings, as estimated in the model, are presented for some of the forcing mechanisms.
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Thibaut Lurton, Yves Balkanski, Vladislav Bastrikov, Slimane Bekki, Laurent Bopp, et al.. Implementation of the CMIP6 Forcing Data in the IPSL-CM6A-LR Model. Journal of Advances in Modeling Earth Systems, American Geophysical Union, 2020, 12 (4), pp.e2019MS001940. ⟨10.1029/2019MS001940⟩. ⟨hal-02875617⟩

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