Validation of climate mitigation pathways

Weigmann, Pascal; Mandaroux, Rahel; Lécuyer, Fabrice; Merfort, Anne; Dorndorf, Tabea; Hoppe, Johanna; Muessel, Jarusch; Pietzcker, Robert; Richters, Oliver; Baumstark, Lavinia; Kriegler, Elmar; Bauer, Nico; Benke, Falk; Gong, Chen Chris; Luderer, Gunnar

doi:10.5194/gmd-18-9897-2025

Articles | Volume 18, issue 23

https://doi.org/10.5194/gmd-18-9897-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-18-9897-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 23

Methods for assessment of models

|

10 Dec 2025

Methods for assessment of models |

| 10 Dec 2025

Validation of climate mitigation pathways

Pascal Weigmann, Rahel Mandaroux, Fabrice Lécuyer, Anne Merfort, Tabea Dorndorf, Johanna Hoppe, Jarusch Muessel, Robert Pietzcker, Oliver Richters, Lavinia Baumstark, Elmar Kriegler, Nico Bauer, Falk Benke, Chen Chris Gong, and Gunnar Luderer

Data sets

NGFS climate scenarios data set O. Richters et al. https://doi.org/10.5281/zenodo.13989530

Model code and software

piamValidation: Validation Tools for PIK-PIAM P. Weigmann et al. https://doi.org/10.5281/zenodo.17661999

REMIND - REgional Model of INvestments and Development 3.2.0 G. Luderer et al. https://doi.org/10.5281/zenodo.7852740

REMIND - REgional Model of INvestments and Development 3.5.0 G. Luderer et al. https://doi.org/10.5281/zenodo.15147820

Short summary

We present the Potsdam Integrated Assessment Modeling validation tool, piamValidation, an open-source R package for validating climate scenarios. The tool enables comparison of model outputs with historical data, feasibility constraints and alternative scenarios. Designed as a community resource, validation configuration files can serve as a knowledge-sharing platform. The main objective is to improve the credibility of Integrated Assessment Models by promoting standardized validation practices.