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Fast adjustment versus slow SST-mediated response of daily precipitation statistics to abrupt 4xCO2

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Abstract

Projected changes in global to regional precipitation remain highly model-dependent and are driven by both fast atmospheric adjustments and slower ocean-mediated responses to increasing concentrations of greenhouse gases. Understanding the relative influence of these multiple drivers is one of the main objectives of the Cloud Feedback Model Intercomparison Project. Here the focus is on the daily precipitation response to an abrupt quadrupling of atmospheric CO2, as simulated by the CNRM-CM6-1 global climate model. Extended atmosphere-only experiments with prescribed sea surface temperature (SST) are used to decompose the precipitation changes into separate responses to uniform SST warming, the pattern of SST anomalies, as well as fast radiative and physiological CO2 effects. The uniform SST warming dominates the global and regional changes in annual mean and annual maximum daily precipitation intensity. In contrast, the annual mean number of wet days and the annual maximum of consecutive dry days show a strong fast adjustment. They are also sensitive to the SST warming pattern that strongly influences changes in large-scale circulation. The increase in daily precipitation intensity drives the global-mean magnitude of the annual precipitation change. In contrast, the response of wet day frequency shapes the geographical distribution and interannual variability of the annual mean precipitation, especially in the subtropics, and is more sensitive to changes in near-surface relative humidity than in the total water column over land. Although the annual precipitation response does not seem highly sensitive to the base state, these results deserve further investigation and model intercomparison within CFMIP.

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Acknowledgements

We would like to thank all people at CNRM and CERFACS who have been involved in the development of the CNRM-CM6-1 model. We are particularly grateful to Romain Roehrig for useful discussions about this manuscript, Richard Stchepounoff for the preparation of the SST and SIC boundary conditions of the AGCM experiments and to Laurent Franchisteguy for the publication of the CRNM-CM6-1 model outputs on the ESGF. The CNRM-CM6-1 model outputs from the CMIP6 DECK and the standard CFMIP experiments can be downloaded from the ESGF data nodes, but the extended atmospheric simulations will be only available on demand. This work is part of the Climate Advanced Forecasting of sub-seasonal Extremes (CAFE) project, which has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Marie Sklodowska-Curie grant agreement No 813844.

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Correspondence to Hervé Douville.

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Douville, H., John, A. Fast adjustment versus slow SST-mediated response of daily precipitation statistics to abrupt 4xCO2. Clim Dyn 56, 1083–1104 (2021). https://doi.org/10.1007/s00382-020-05522-w

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  • DOI: https://doi.org/10.1007/s00382-020-05522-w

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