Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-233
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
02 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
The Bern Simple Climate Model (BernSCM) v1.0: an extensible and fully documented open source reimplementation of the Bern reduced form model for global carbon cycle-climate simulations
Kuno Strassmann1,a and Fortunat Joos1 1University of Bern, Switzerland
anow at: Federal Institute of Technology, Switzerland
Abstract. The Bern Simple Climate Model (BernSCM v1.0) is a free open source reimplementation of a reduced form carbon cycle-climate model which has been used widely in previous scientific work and IPCC assessments. BernSCM represents the carbon cycle and climate system with a small set of equations for the heat and carbon budget, the parametrization of major nonlinearities, and the substitution of complex component systems with impulse response functions (IRF). The IRF approach allows cost-efficient yet accurate substitution of detailed parent models of climate system components with near linear behaviour. Illustrative simulations of scenarios from previous multi-model studies show that BernSCM is broadly representative of the range of the climate-carbon cycle response simulated by more complex and detailed models. Model code (in Fortran) was written from scratch with transparency and extensibility in mind, and is provided as open source. BernSCM makes scientifically sound carbon cycle-climate modeling available for many applications. Supporting up to decadal timesteps with high accuracy, it is suitable for studies with high computational load, and for coupling with, e.g., Integrated Assessment Models (IAM). Further applications include climate risk assessment in a business, public, or educational context, and the estimation of CO2 and climate benefits of emission mitigation options.

Citation: Strassmann, K. and Joos, F.: The Bern Simple Climate Model (BernSCM) v1.0: an extensible and fully documented open source reimplementation of the Bern reduced form model for global carbon cycle-climate simulations, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-233, in review, 2017.
Kuno Strassmann and Fortunat Joos
Kuno Strassmann and Fortunat Joos

Model code and software

BernSCM v1.0
K. Strassmann and F. Joos
https://doi.org/10.5281/zenodo.1038117
Kuno Strassmann and Fortunat Joos

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Short summary
The Bern Simple Climate Model (BernSCM) is a free open source reimplementation of a reduced form carbon cycle-climate model widely used in science and IPCC assessments. BernSCM supports up to decadal time steps with high accuracy and is suitable for studies with high computational load, e.g., Integrated Assessment Models (IAM). Further applications include climate risk assessment in a business, public, or educational context, and the estimation of benefits of emission mitigation options.
The Bern Simple Climate Model (BernSCM) is a free open source reimplementation of a reduced form...
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