Reduced global warming from CMIP6 projections when weighting models by performance and independence

Brunner, Lukas; Pendergrass, Angeline G.; Lehner, Flavio; Merrifield, Anna L.; Lorenz, Ruth; Knutti, Reto

doi:https://doi.org/10.5194/esd-11-995-2020

Articles | Volume 11, issue 4

https://doi.org/10.5194/esd-11-995-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/esd-11-995-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 11, issue 4

Research article

| Highlight paper

|

13 Nov 2020

Research article | Highlight paper |

| 13 Nov 2020

Reduced global warming from CMIP6 projections when weighting models by performance and independence

Lukas Brunner, Angeline G. Pendergrass, Flavio Lehner, Anna L. Merrifield, Ruth Lorenz, and Reto Knutti

Supplement

https://doi.org/10.5194/esd-11-995-2020-supplement

Data sets

ERA5 ECMWF https://doi.org/10.24381/cds.adbb2d47

MERRA2 NASA https://doi.org/10.5067/9SC1VNTWGWV3

Model code and software

Climate model Weighting by Independence and Performance (ClimWIP): Code Freeze for Brunner et al. (2020) ESD L. Brunner, R. Lorenz, A. L. Merrifield, and J. Sedlacek https://doi.org/10.5281/zenodo.4073039

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Short summary

In this study, we weight climate models by their performance with respect to simulating aspects of historical climate and their degree of interdependence. Our method is found to increase projection skill and to correct for structurally similar models. The weighted end-of-century mean warming (2081–2100 relative to 1995–2014) is 3.7 °C with a likely (66 %) range of 3.1 to 4.6 °C for the strong climate change scenario SSP5-8.5; this is a reduction of 0.4 °C compared with the unweighted mean.