Evaluation of CNRM Earth System Model, CNRM-ESM2-1: Role of Earth System Processes in Present-Day and Future Climate

Type Article
Date 2019-12
Language English
Author(s) Seferian RolandORCID1, Nabat Pierre1, Michou Martine1, Saint-Martin DavidORCID1, Voldoire AuroreORCID1, Colin Jeanne1, Decharme BertrandORCID1, Delire ChristineORCID1, Berthet SarahORCID1, Chevallier Matthieu1, Senesi Stephane1, Franchisteguy LaurentORCID1, Vial Jessica2, Mallet Marc1, Joetzjer Emilie1, Geoffroy Olivier1, Gueremy Jean-Francois1, Moine Marie-Pierre3, Msadek Rym3, Ribes Aurelien1, Rocher Matthias1, Roehrig Romain1, Salas-Y-Melia David1, Sanchez Emilia3, Terray Laurent3, Valcke Sophie3, Waldman Robin1, Aumont OlivierORCID, Bopp Laurent2, Deshayes JulieORCID4, Ethe Christian5, Madec Gurvan4, 6
Affiliation(s) 1 : Univ Toulouse, CNRS, CNRM, Meteo France, Toulouse, France.
2 : Sorbonne Univ, PSL Res Univ, Ecole Polytech, Ecole Normale Super, Paris, France.
3 : Univ Toulouse, CNRS, CERFACS, CECI, Toulouse, France.
4 : Sorbonne Univ, CNRS, IRD, LOCEAN,IPSL,MNHN, Paris, France.
5 : Inst Pierre Simon Laplace, Paris, France.
6 : Univ Grenoble Alpes, INRIA, Grenoble, France.
Source Journal Of Advances In Modeling Earth Systems (1942-2466) (Amer Geophysical Union), 2019-12 , Vol. 11 , N. 12 , P. 4182-4227
DOI 10.1029/2019MS001791
WOS© Times Cited 40
Note This article also appears in: The CNRM Climate and Earth System Models for CMIP6

This study introduces CNRM-ESM2-1, the Earth system (ES) model of second generation developed by CNRM-CERFACS for the sixth phase of the Coupled Model Intercomparison Project (CMIP6). CNRM-ESM2-1 offers a higher model complexity than the Atmosphere-Ocean General Circulation Model CNRM-CM6-1 by adding interactive ES components such as carbon cycle, aerosols, and atmospheric chemistry. As both models share the same code, physical parameterizations, and grid resolution, they offer a fully traceable framework to investigate how far the represented ES processes impact the model performance over present-day, response to external forcing and future climate projections. Using a large variety of CMIP6 experiments, we show that represented ES processes impact more prominently the model response to external forcing than the model performance over present-day. Both models display comparable performance at replicating modern observations although the mean climate of CNRM-ESM2-1 is slightly warmer than that of CNRM-CM6-1. This difference arises from land cover-aerosol interactions where the use of different soil vegetation distributions between both models impacts the rate of dust emissions. This interaction results in a smaller aerosol burden in CNRM-ESM2-1 than in CNRM-CM6-1, leading to a different surface radiative budget and climate. Greater differences are found when comparing the model response to external forcing and future climate projections. Represented ES processes damp future warming by up to 10% in CNRM-ESM2-1 with respect to CNRM-CM6-1. The representation of land vegetation and the CO2-water-stomatal feedback between both models explain about 60% of this difference. The remainder is driven by other ES feedbacks such as the natural aerosol feedback.

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Seferian Roland, Nabat Pierre, Michou Martine, Saint-Martin David, Voldoire Aurore, Colin Jeanne, Decharme Bertrand, Delire Christine, Berthet Sarah, Chevallier Matthieu, Senesi Stephane, Franchisteguy Laurent, Vial Jessica, Mallet Marc, Joetzjer Emilie, Geoffroy Olivier, Gueremy Jean-Francois, Moine Marie-Pierre, Msadek Rym, Ribes Aurelien, Rocher Matthias, Roehrig Romain, Salas-Y-Melia David, Sanchez Emilia, Terray Laurent, Valcke Sophie, Waldman Robin, Aumont Olivier, Bopp Laurent, Deshayes Julie, Ethe Christian, Madec Gurvan (2019). Evaluation of CNRM Earth System Model, CNRM-ESM2-1: Role of Earth System Processes in Present-Day and Future Climate. Journal Of Advances In Modeling Earth Systems, 11(12), 4182-4227. Publisher's official version : https://doi.org/10.1029/2019MS001791 , Open Access version : https://archimer.ifremer.fr/doc/00676/78800/