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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/100498 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/100498 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/100498 archive 353 disk0/00/01/85/63 2023-01-12 09:06:12 2023-01-12 09:06:12 2023-01-12 09:06:12 article show Bossy T. 9374 Gasser T. 2136 0000-0003-4882-2647 Ciais P. pub ASA EM ECE IACC The Pathfinder model was developed to fill a perceived gap within the range of existing simple climate models. Pathfinder is a compilation of existing formulations describing the climate and carbon cycle systems, chosen for their balance between mathematical simplicity and physical accuracy. The resulting model is simple enough to be used with Bayesian inference algorithms for calibration, which enables assimilation of the latest data from complex Earth system models and the IPCC sixth assessment report, as well as a yearly update based on observations of global temperature and atmospheric CO2. The model's simplicity also enables coupling with integrated assessment models and their optimization algorithms or running the model in a backward temperature-driven fashion. In spite of this simplicity, the model accurately reproduces behaviours and results from complex models - including several uncertainty ranges - when run following standardized diagnostic experiments. Pathfinder is an open-source model, and this is its first comprehensive description. 2022-12-12 published European Geosciences Union (EGU) ; Copernicus doi:10.5194/gmd-15-8831-2022 3225 2885 public Geoscientific Model Development 15 23 8831-8868 TRUE 1991-9603 Constraining uncertainty of multi decadal climate projections (CONSTRAIN, H2020 820829) yes info:eu-repo/grantAgreement/EC/H2020/820829/EU//CONSTRAIN info:eu-repo/semantics/article info:eu-repo/semantics/openAccess