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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-732
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-732
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Aug 2020

28 Aug 2020

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This preprint is currently under review for the journal ACP.

Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP)

Ben Kravitz1,2, Douglas G. MacMartin3, Daniele Visioni3, Olivier Boucher4, Jason N. S. Cole5, Jim Haywood6,7, Andy Jones7, Thibaut Lurton4, Pierre Nabat8, Ulrike Niemeier9, Alan Robock10, Roland Séférian8, and Simone Tilmes11 Ben Kravitz et al.
  • 1Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN, USA
  • 2Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA
  • 3Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA
  • 4Institut Pierre-Simon Laplace (IPSL), Sorbonne Université/CNRS, Paris, France
  • 5Environment and Climate Change Canada, Toronto, Ontario, Canada
  • 6College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom
  • 7UK Met Office Hadley Centre, Exeter, United Kingdom
  • 8CNRM, Université de Toulouse, Météo-France, CNRS, Météo-France, Toulouse, France
  • 9Max Planck Institute for Meteorology, Hamburg, Germany
  • 10Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, USA
  • 11Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA

Abstract. Solar geoengineering has been receiving increased attention in recent years as a potential temporary solution to offset global warming. One method of approximating global-scale solar geoengineering in climate models is via solar reduction experiments. Two generations of models in the Geoengineering Model Intercomparison Project (GeoMIP) have now simulated offsetting a quadrupling of the CO2 concentration with solar reduction. This simulation is artificial and designed to elicit large responses in the models. Here we show that energetics, temperature, and hydrological cycle changes in this experiment are statistically indistinguishable between the two ensembles. Of the variables analyzed here, the only major differences involve highly parameterized and uncertain processes, such as cloud forcing or terrestrial net primary productivity. We conclude that despite numerous structural differences and uncertainties in models over the past 20 years, including an increase in climate sensitivity in the latest generation of models, broad conclusions about the climate response to global solar dimming remain robust.

Ben Kravitz et al.

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Short summary
This study investigates multi-model response to idealized geoengineering (high CO2 with solar reduction) across two different generations of climate models. We find that except in a few cases, the results are unchanged between the different generations. This gives us confidence that broad conclusions about the response to idealized geoengineering are robust.
This study investigates multi-model response to idealized geoengineering (high CO2 with solar...
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