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

Kravitz, Ben ; MacMartin, Douglas G. ; Visioni, Daniele ; Boucher, Olivier ; Cole, Jason N. S. ; Haywood, Jim ; Jones, Andy ; Lurton, Thibaut ; Nabat, Pierre ; Niemeier, Ulrike ; Robock, Alan ; Séférian, Roland ; Tilmes, Simone

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<p align=justify>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 CO<span class="inline-formula"><sub>2</sub></span> concentration with solar reduction. This simulation is idealized 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 two generations of models, including an increase in climate sensitivity in the latest generation of models, the models are consistent in their aggregate climate response to global solar dimming.</p>
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