Abstract
Abstract. The Bern Simple Climate Model (BernSCM) is a free open-source
re-implementation 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 (IRFs). The IRF approach
allows cost-efficient yet accurate substitution of detailed parent
models of climate system components with near-linear behavior.
Illustrative simulations of scenarios from previous multimodel
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 open
source. BernSCM makes scientifically sound carbon cycle–climate
modeling available for many applications. Supporting up to decadal
time steps with high accuracy, it is suitable for studies with high
computational load and for coupling with integrated assessment
models (IAMs), for example. 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.
Funder
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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