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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-329
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-329
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 28 Nov 2019

Submitted as: development and technical paper | 28 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

CLASSIC v1.0: the open-source community successor to the Canadian Land Surface Scheme (CLASS) and the Canadian Terrestrial Ecosystem Model (CTEM) – Part 1: Model framework and site-level performance

Joe R. Melton1, Vivek K. Arora2, Eduard Wisernig-Cojoc1, Christian Seiler1, Matthew Fortier1, Ed Chan3, and Lina Teckentrup4 Joe R. Melton et al.
  • 1Climate Research Division, Environment and Climate Change Canada, Victoria, B.C., Canada
  • 2Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, B.C., Canada
  • 3Climate Research Division, Environment and Climate Change Canada, Toronto, Ont., Canada
  • 4Max Planck Institute for Meteorology, 20146 Hamburg, Germany

Abstract. Recent reports by the Global Carbon Project highlight large uncertainties around land surface processes such as land use change, strength of CO2 fertilization, nutrient limitation and supply, and response to variability in climate. Process-based land surface models are well-suited to address these complex and emerging global change problems, but will require extensive development and evaluation. The coupled Canadian Land Surface Scheme and Canadian Terrestrial Ecosystem Model (CLASS-CTEM) framework has been under continuous development by Environment and Climate Change Canada since 1987. As the open-source model of code development has revolutionized the software industry, scientific software is experiencing a similar evolution. Given the scale of the challenge facing land surface modellers, and the benefits of open-source, or community model, development, we have transitioned CLASS-CTEM from an internally developed model to an open-source community model, which we call the Canadian Land Surface Scheme including Biogeochemical Cycles (CLASSIC) v. 1.0. CLASSIC contains many technical features specifically designed to encourage community use including software containerization for serial and parallel simulations, extensive benchmarking software and data (Automated Model Benchmarking; AMBER), self-documenting code, community standard formats for model inputs and outputs, amongst others. Here we evaluate and benchmark CLASSIC against 31 FLUXNET sites where the model has been tailored to the site-level conditions and driven with observed meteorology. Future versions of CLASSIC will be developed using AMBER and these initial benchmark results to evaluate model performance over time. CLASSIC remains under active development and the code, site-level benchmarking data, software container and AMBER are freely available for community use.

Joe R. Melton et al.
Interactive discussion
Status: open (until 23 Jan 2020)
Status: open (until 23 Jan 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Joe R. Melton et al.
Data sets

Benchmarking data and outputs for CLASSIC v. 1.0 J. R. Melton, L. Teckentrup, and M. Fortier https://doi.org/10.5281/zenodo.3525336

Model code and software

The Canadian Land Surface Scheme including Biogeochemical Cycles J. R. Melton, V. Arora, E. Wisernig-Cojoc, C. Seiler, M. Fortier, E. Chan, and L. Teckentrup https://doi.org/10.5281/zenodo.3522407

Executable research compendia (ERC)

Singularity software container for the Canadian Land Surface Scheme including Biogeochemical Cycles (CLASSIC) J. R. Melton, C. Seiler, and M. Fortier https://doi.org/10.5281/zenodo.3525249

Joe R. Melton et al.
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Short summary
We transitioned the CLASS-CTEM land surface model to an open-source community model format by modernizing the code base to make the model easier to use and understand; providing a complete software environment to run the model within; developing a benchmarking suite for model evaluation; and creating an infrastructure to support community involvement. The new model, the Canadian Land Surface Scheme including Biogeochemical Cycles (CLASSIC), is now available for the community to use and develop.
We transitioned the CLASS-CTEM land surface model to an open-source community model format by...
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