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Forcings and feedbacks in the GeoMIP ensemble for a reduction in solar irradiance and increase in CO2

Nicolas Huneeus 1 Olivier Boucher 1 Kari Alterskjaer 2 Jason N. S. Cole 3 Charles L. Curry 4 Duoying Ji 5 Andy Jones 6 Ben Kravitz 7 Jón Egill Kristjánsson 2 John C. Moore 5 Helene Muri 2 Ulrike Niemeier 8 Phil Rasch 7 Alan Robock 9 Balwinder Singh 7 Hauke Schmidt 8 Michael Schulz 10 Simone Tilmes 11 Shingo Watanabe 12 Jin-Ho Yoon 7
1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 Department of Geosciences [Oslo]
3 CCCma - Canadian Centre for Climate Modelling and Analysis
4 School of Earth and Ocean Sciences, University of Victoria
5 State Key Laboratory of Earth Surface Processes and Resource Ecology
6 MOHC - Met Office Hadley Centre for Climate Change
7 Atmospheric Sciences and Global Change Division
8 MPI-M - Max Planck Institute for Meteorology
9 Department of Environmental Sciences [New Brunswick]
10 MET - Norwegian Meteorological Institute [Oslo]
11 NCAR - National Center for Atmospheric Research [Boulder]
12 JAMSTEC - Japan Agency for Marine-Earth Science and Technology
Abstract : The effective radiative forcings (including rapid adjustments) and feedbacks associated with an instantaneous quadrupling of the preindustrial CO2 concentration and a counterbalancing reduction of the solar constant are investigated in the context of the Geoengineering Model Intercomparison Project (GeoMIP). The forcing and feedback parameters of the net energy flux, as well as its different components at the top-of-atmosphere (TOA) and surface, were examined in 10 Earth System Models to better understand the impact of solar radiation management on the energy budget. In spite of their very different nature, the feedback parameter and its components at the TOA and surface are almost identical for the two forcing mechanisms, not only in the global mean but also in their geographical distributions. This conclusion holds for each of the individual models despite intermodel differences in how feedbacks affect the energy budget. This indicates that the climate sensitivity parameter is independent of the forcing (when measured as an effective radiative forcing). We also show the existence of a large contribution of the cloudy-sky component to the shortwave effective radiative forcing at the TOA suggesting rapid cloud adjustments to a change in solar irradiance. In addition, the models present significant diversity in the spatial distribution of the shortwave feedback parameter in cloudy regions, indicating persistent uncertainties in cloud feedback mechanisms.
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Nicolas Huneeus, Olivier Boucher, Kari Alterskjaer, Jason N. S. Cole, Charles L. Curry, et al.. Forcings and feedbacks in the GeoMIP ensemble for a reduction in solar irradiance and increase in CO2. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2014, 119 (9), pp.5226-5239. ⟨10.1002/2013JD021110⟩. ⟨hal-01083697⟩

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